PhyLab - User contributions [en]

Tennis racket rotation

2021-11-05T20:07:59Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D40.00

==Description==
The center of mass in a tennis racket is at the base of the loop. This is shown when the tennis racket is spun in the air.

==Equipment==
*Tennis racket

==Instructions==
Throw the tennis racket in the air such that it rotates rapidly, end over end. The center of mass of the racket will appear to fly in a parabolic pattern.

==Keywords==
tennis racket, centre of mass, rotation

==Images & Movies==
<gallery>
File:1D40.00_1.JPG|Figure1
</gallery>

{{#widget:YouTube|width=600|height=337|id=V3DytBdY22g }}

Rigid pendulum

2021-07-23T16:08:40Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[3A_-_Oscillations|3A - Oscillations]] 
PIRA index: 3A15.20

==Description==
A ruler with different slots (to adjust height) acts as a rigid pendulum. A rod with a mass on its end can also act as a rigid pendulum.

==Equipment==
*rigid pendulum (ruler or bar)
*rod attachment

==Instructions==
Connect the rigid pendulum to the rod attachment. Shift the pendulum to a small angle from vertical and allow it to oscillate and demonstrate simple harmonic motion.

==Keywords==
adjustable, rigid pendulum, period, oscillation

==Images & Movies==
<gallery>
File:3A15.20_1.JPG|Figure1
File:3A15.20_2.JPG|Figure2
</gallery>


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Rocket on air track

2021-07-23T15:53:45Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1H_-_Newton%27s_Third_Law|1H - Newton's Third Law]] 
PIRA index: 1H11.30

==Description==
An angled aluminum cylinder, mounted on a friction-less surface, is filled with liquid CO2 from an spray duster can then sealed with a small aperture. The cylinder is heated and as the CO2 evaporates within the cylinder, gas is expelled through the aperture thus propelling the cylinder forward.

==Equipment==
*air track with pump and tubing, power cable
*rocket cylinder with aperture and seal
*spray duster canister
*torch

==Instructions==
Connect the air track to the pump and turn it on. Invert the spray duster canister and shoot the liquid CO2 it into the rocket cylinder for about 3-4 seconds. Seal the rocket with the aperture and ball stopper and place it on the air track. Heat the lower end of the cylinder with the torch until the rocket starts to move along the track.

==Keywords==
rocket, air track, CO2, carbon dioxide, friction-less, torch, evaporation, aperture

==Images & Movies==
<gallery>
File:1H11.30_1.JPG|Figure1
File:1H11.30_2.JPG|Figure2
</gallery>


Rocket on air track -- rubber ball

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Rocket on air track -- tube

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Cart with vertical ball launcher

2021-07-23T15:34:16Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D60.10

==Description==
A moving cart launches a ball vertically. The ball lands back in the launcher because it has the same horizontal velocity as the cart.

==Equipment==
*Cart with vertical launcher
*Ball bearing

==Instructions==
1) Push the ball bearing down into the cart's launcher and a rod will emerge at the bottom. 
2) Place the pin through the hole in the rod to hold the launcher steady. 
3) Put the cart in motion then pull out the pin. The ball bearing will launch vertically.

==Keywords==
acceleration, velocity, cart, car, ball, launch, shoot, vertical

==Images & Movies==
<gallery>
File:1D60.10_1.JPG|Figure1
</gallery>


Cart with vertical ball launcher

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Cart with vertical ball launcher with red line

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Weigh a mass submerged in water

2021-07-23T15:29:50Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[2B - Statics of fluids]] 
PIRA index: 2B40.10

==Description==
Suspend a 1 kg mass of aluminum from a spring scale and then lower the block into water and note the new weight.

==Equipment==
* Larger beaker
* Fish scale
* 1kg mass
* Water

==Instructions==

==Keywords==

==Images & Movies==


Weight a mass submerged in water -- 1 Kg Mass in Water in Newton

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Weight a mass submerged in water -- 1 Kg Mass in Water in gramme

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Weight a mass submerged in water -- 1 Kg Mass in Water in gramme

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Weight a mass submerged in water -- 1.8 Kg Mass in Water in gramme

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Weigh a mass submerged in water

2021-07-22T14:35:32Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[2B - Statics of fluids]] 
PIRA index: 2B40.10

==Description==
Suspend a 1 kg mass of aluminum from a spring scale and then lower the block into water and note the new weight.

==Equipment==
* Larger beaker
* Fish scale
* 1kg mass
* Water

==Instructions==

==Keywords==

==Images & Movies==


Weight a mass submerged in water -- 1 Kg Mass in Water

{{#widget:YouTube|width=600|height=337|id=Hcl1BW4kgVI}}

Weight a mass submerged in water -- 1 Kg Mass in Water

{{#widget:YouTube|width=600|height=337|id=7r39268lmIg}}

Weight a mass submerged in water -- 1 Kg Mass in Water

{{#widget:YouTube|width=600|height=337|id=PktjjbP6HhE}}


Weight a mass submerged in water -- 1.8 Kg Mass in Water

{{#widget:YouTube|width=600|height=337|id=wTMKThkJrtE}}

Weigh a mass submerged in water

2021-06-28T14:53:54Z

Srobinea: /* Images & Movies */

Rotating platform

2021-06-16T20:23:50Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[1Q_-_Rotational_Dynamics|1Q - Rotational Dynamics]] 
PIRA index: 1Q30.10

==Description==
The rotating platform can be used to show how angular velocity is affected by moment of inertia (large radius vs small radius). It also allows the demonstration of rotational motion/dynamics using compressed air cans or held masses or a spinning bicycle wheel.

==Equipment==
*rotating platform
*bicycle wheel with motor
*two air duster canisters
*two 1 kg masses

==Instructions==
Suggestions:

1) Have a student stand on the platform and begin to spin the student slowly. Once the student is balanced and rotating comfortably, have them extend their arms then slow retract them. Have the student try this while holding 500 g or 1 kg masses in each hand. Their angular velocity is higher when their arms are close to their body (smaller moment of inertia).

2) Have a student hold two air duster canisters, pointed in opposite directions in their hands with outstretched arms. When the student activated the canisters, she will begin to rotate slowly.

3) Have a student stand on the platform and hand them a vertically spinning bicycle wheel. Due to conservation of angular momentum, the platform will begin to rotate if the student turns the wheel horizontal. Have the student try to rotate the wheel back to vertical and then to the opposite horizontal.

==Keywords==
rotating platform, moment, inertia, angular, velocity, acceleration, conservation, angular momentum, air duster, bicycle wheel,

==Images & Movies==
<gallery>
File:1Q30.10_1.JPG|Figure1
</gallery>

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Monkey and hunter

2021-06-16T19:08:46Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D60.30

==Description==
A hunter spies a monkey in a tree, takes aim, and fires. At the moment the bullet leaves the gun the monkey lets go of the tree branch and drops straight down. Does the hunter's bullet hit the monkey?
 
To simulate this experiment, a ballbearing is aimed upwards at a suspended metal disc. When the ballbearing is shot, the disc is released. The ballbearing will hit the disc because their vertical acceleration is equal.

==Equipment==
* Monkey (Metal plate in front of his body is for hearing the sound of impact)
* Projectile Launcher (barrel modified for a 3/8" ball bearing)
* Arduino Uno
* Electromagnet
* "C" clamp with post
* 2 quick-grip
* Power cord
* Power bar

==Instructions==
Intruct please.

==Keywords==
monkey, fall, ballbearing, shoot, disc, acceleration, vertical, projectile

==Images & Movies==


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Falling and shooting ball

2021-06-16T18:51:21Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D60.20

==Description==
Also known as '''projectile motion''' or '''simultaneous fall'''.
A ball shot horizontally by a projectile launcher will hit the floor at the same time as a ball dropped from the same height.

==Equipment==
*Projectile launcher with hand pump
*2 x ball bearings
*Vernier power adapter
*Power bar

==Instructions==
Instruct please.

==Keywords==
projectile, motion, ball, vertical, acceleration, shoot, ballbearing

==Images & Movies==
<gallery>



</gallery>

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Falling and shooting ball

2021-06-16T18:48:14Z

Srobinea: /* Images & Movies */

Falling and shooting ball

2021-06-16T18:46:22Z

Srobinea:

Falling and shooting ball

2021-06-16T18:44:00Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D60.20

==Description==
Also known as '''projectile motion''' or '''simultaneous fall'''.
A ball shot horizontally by a projectile launcher will hit the floor at the same time as a ball dropped from the same height.

==Equipment==
*Projectile launcher with hand pump
*2 x ball bearings
*Vernier power adapter
*Power bar

==Instructions==
Instruct please.

==Keywords==
projectile, motion, ball, vertical, acceleration, shoot, ballbearing

==Images & Movies==
<gallery>
Image:1D60.20_1.JPG|Figure1
Image:1D60.20_2.JPG|Figure2
Image:1D60.20_3.JPG|Figure3
</gallery>

==Images & Movies==
<gallery>

</gallery>


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Falling and shooting ball

2021-06-16T18:43:04Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D60.20

==Description==
Also known as '''projectile motion''' or '''simultaneous fall'''.
A ball shot horizontally by a projectile launcher will hit the floor at the same time as a ball dropped from the same height.

==Equipment==
*Projectile launcher with hand pump
*2 x ball bearings
*Vernier power adapter
*Power bar

==Instructions==
Instruct please.

==Keywords==
projectile, motion, ball, vertical, acceleration, shoot, ballbearing

==Images & Movies==
<gallery>
Image:1D60.20_1.JPG|Figure1
Image:1D60.20_2.JPG|Figure2
Image:1D60.20_3.JPG|Figure3
</gallery>

==Images & Movies==
<gallery>
File:5A20_25_Pingpong01.JPG
</gallery>


{{#widget:YouTube|id=4Y3JG6B0DWE}}

Charging by induction

2021-06-16T18:41:01Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[5A_-_Electrostatics|5A - Electrostatics]] 
PIRA index: 5A40.10
==Description==
Charges redistribute themselves in a conductor under the influence of an external electrostatic field. For example, a positive charge close to a neutral conductor will attract the negative charges in the conductor to the closest surface, leaving the opposite side with a positive charge.

With this principle, an object A can be charged if it is grounded while another charged object B is held close. The induction pushes the charges in the ground. Disconnecting the ground and taking away the charged object B, object A will be left with an opposite charge. The [[electrophorus]] works on that principle.

==Equipment==

==Instructions==

==Keywords==

==Images & Movies==
<gallery>
File:IMG 2492.JPG
</gallery>
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Ping-pong ball electroscope

2021-06-07T18:51:04Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[5A_-_Electrostatics|5A - Electrostatics]] 
PIRA index: 5A20.25

==Description==
Two suspended ping-pong balls repel each other when they have the same charge

==Equipment==
* Ping-pong ball electroscope
* Charge generator ([[Electrophorus]], [[Van de Graaff generator]], [[Wimshurst machine]], etc.)

==Instructions==

==Keywords==

==Images & Movies==
<gallery>
File:5A20_25_Pingpong01.JPG
</gallery>


{{#widget:YouTube|width=600|height=337|id=JCbkj7IFzZk}}

Triboelectric effect

2021-06-07T18:47:16Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[5A_-_Electrostatics|5A - Electrostatics]] 
PIRA index: 5A10.10

==Description==
Some material holds on to their electron better than others. Therefore, rubbing different materials together can cause a transfer of charge between them. The direction of the transfer of charge depends on the material, the surfaces shape, temperature and strain. The effect is consistent between two specific objects, but is not very predictable in general.

==Equipment==
* Piece of material that gives their electron easily: fur, glass, wool, etc
* Piece of material that doesn't give their electron easily: plastic, styrofoam, rubber, etc.
* Electroscope

==Instructions==
* Bring each object close to the electroscope to show their neutrality
* Rub the two object together.
* Bring each of them close to an electroscope to show the charge the gathered.

==Keywords==
electrophorus,electroscope, fur, rubber.

==Images & Movies==
<gallery>
File:IMG 2492.JPG
</gallery>
{{#widget:YouTube|width=600|height=337|id=GAIkhs70wzs}}

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Triboelectric effect

2021-06-07T18:44:48Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[5A_-_Electrostatics|5A - Electrostatics]] 
PIRA index: 5A10.10

==Description==
Some material holds on to their electron better than others. Therefore, rubbing different materials together can cause a transfer of charge between them. The direction of the transfer of charge depends on the material, the surfaces shape, temperature and strain. The effect is consistent between two specific objects, but is not very predictable in general.

==Equipment==
* Piece of material that gives their electron easily: fur, glass, wool, etc
* Piece of material that doesn't give their electron easily: plastic, styrofoam, rubber, etc.
* Electroscope

==Instructions==
* Bring each object close to the electroscope to show their neutrality
* Rub the two object together.
* Bring each of them close to an electroscope to show the charge the gathered.

==Keywords==
electrophorus,electroscope, fur, rubber.

==Images & Movies==
<gallery>
File:IMG 2492.JPG
</gallery>
{{#widget:YouTube|id=NNZO5Z4uJAI}}

{{#widget:YouTube|id=mUTm7nOr4fg}}

{{#widget:YouTube|width=600|height=337|id=GAIkhs70wzs}}

Discharging with a flame

2021-06-07T18:33:02Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[5A - Electrostatics]] 
PIRA index: 5A10.??

==Description==
A flame produces an ionized gas that will capture charges of nearby objects if available

==Equipment==
* [[Braun Electroscope]]
* Candle

==Instructions==

==Keywords==
candle, Braun Electroscope, flame, discharging charge, electrophorus.

==Images & Movies==
<gallery>
File:5A10 CandleandElectroscope01.jpg
</gallery>

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Flexible wind tube

2021-06-07T18:27:55Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[3D_-_Instruments|3D - Instruments]] 
PIRA index: 3D30.35

==Description==
A flexible, corrugated plastic tube, hollow on both ends, is spun around in a circle. The air flowing through the tube creates a sound due to standing wave resonance.
Also can be called a "whirly tube", a "corrugaphone", or a "bloogle resonator".

==Equipment==
*wind tubes

==Instructions==
Hold the tip of the tube and swing it rapidly in a circle. If you swing it fast enough you will be able to hear the emitted sound. The pitch depends on the length of the tube and its velocity.

==Keywords==
frequency tube, wind organ pipe

==Images & Movies==
<gallery>
File:3D30.35_1.JPG|Figure1
</gallery>


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Doppler effect

2021-06-07T18:25:41Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[3B_-_Wave_motion|3B - Wave motion]] 
PIRA index: 3B40.18

==Description==
A tuning fork, attached to a string, is rung and then spun around to simulate the Doppler effect.

==Equipment==
*tuning fork attached to string
*mallet

==Instructions==
Strike the tuning fork then spin the string around your head to simulate the Doppler effect.

==Keywords==
doppler effect, tuning fork, frequency, spin

==Images & Movies==
<gallery>
File:3B40.18_1.JPG|Figure1
</gallery>


Doppler effect - All manipulations

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Doppler effect - 1

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Doppler effect - 2

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Doppler effect - 3

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Mass on a spring

2021-06-07T18:22:10Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[3A_-_Oscillations|3A - Oscillations]] 
PIRA index: 3A20.10

==Description==
An oscillating mass on a spring demonstrates simple harmonic motion.

==Equipment==
*mass on a spring
*rod attachment

==Instructions==
Get the mass oscillating slowly. The period of oscillation should not change significantly.

==Keywords==
mass, spring, oscillation, simple harmonic motion

==Images & Movies==
<gallery>
File:3A20.10_2.JPG|Figure1
</gallery>

{{#widget:YouTube|width=600|height=337|id=HRp5g0WSBJ8}}

Springs

2021-06-07T18:21:12Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[3A_-_Oscillations|3A - Oscillations]] 
PIRA index: 3A20.10

==Description==
The stiffness of springs can affect their period of oscillation for a given mass.

==Equipment==
*two spring with different stiffnesses
*two equal masses
*rod attachments

==Instructions==
Connect both masses to the springs. The springs will stretch to different lenghts. Start both mass and springs oscillating in phase. They will slowly go out of phase as their periods of oscillation are not equal due to having different stiffnesses.

==Keywords==
spring, stiffness, oscillation, mass

==Images & Movies==
<gallery>
File:3A20.10_1.JPG|Figure1
</gallery>

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Rigid pendulum

2021-06-07T18:20:02Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[3A_-_Oscillations|3A - Oscillations]] 
PIRA index: 3A15.20

==Description==
A ruler with different slots (to adjust height) acts as a rigid pendulum. A rod with a mass on its end can also act as a rigid pendulum.

==Equipment==
*rigid pendulum (ruler or bar)
*rod attachment

==Instructions==
Connect the rigid pendulum to the rod attachment. Shift the pendulum to a small angle from vertical and allow it to oscillate and demonstrate simple harmonic motion.

==Keywords==
adjustable, rigid pendulum, period, oscillation

==Images & Movies==
<gallery>
File:3A15.20_1.JPG|Figure1
File:3A15.20_2.JPG|Figure2
</gallery>


{{#widget:YouTube|width=600|height=337|id=rpIkmrqzVb0}}
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Torsional oscillations of rigid pendulum

2021-06-07T18:18:40Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[3A_-_Oscillations|3A - Oscillations]] 
PIRA index: 3A10.30

==Description==
A ruler with masses on its end or a solid metal bar demonstrates torsional oscillations.

==Equipment==
*ruler with adjustable mass positions
*metal bar
*attachment rod and clamp

==Instructions==
Hang the ruler setup or metal bar from it's center by a solid wire. Twist the bar and release it such that is created torsional oscillations. The period of oscillation can be adjusted by changing the position of the masses on the ruler.

==Keywords==
rigid pendulum, torsional, oscillation

==Images & Movies==
<gallery>
File:3A10.30_1.JPG|Figure1
File:3A10.30_2.JPG|Figure2
</gallery>


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Simple pendulum

2021-06-07T18:17:19Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[3A_-_Oscillations|3A - Oscillations]] 
PIRA index: 3A10.10

==Description==
A small mass on a string acts as a simple pendulum. The length of the string can be adjusted to change the period of oscillation.

==Equipment==
Various setups:

*mass on a string
*physical pendulum
*mass on a string with length measurement

==Instructions==
Hold the string and swing the pendula back and forth to demonstrate oscillations and simple harmonic motion. You can change the length of string to change the period of oscillation.

==Keywords==
simple pendulum, string, oscillation

==Images & Movies==
<gallery>
File:3A10.10_1.JPG|Figure1
File:3A10.10_2.JPG|Figure2
File:3A10.10_3.JPG|Figure3
File:3A10.10_4.JPG|Figure4
</gallery>
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Bowling ball pendulum

2021-06-07T18:13:12Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1M_-_Work_and_Energy|1M - Work and Energy]] 
PIRA index: 1M40.10

==Description==
The amplitude of an oscillating pendulum will not increase (the bowling ball will not hit the person's face).

==Equipment==
*ladder and rod arrangement
*bowling ball pendulum attached to rod.

==Instructions==
Have a demonstrator kneel about 3 feet from the resting bowling ball. Bring the bowling ball up to the demonstrator's face and release it. The ball will oscillate but its amplitude will not increase.

==Keywords==
bowling, ball, pendulum, oscillation, amplitude

==Images & Movies==
<gallery>
File:1M40.10_1.JPG|Figure1
</gallery>

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Bicycle wheel as gyroscope

2021-06-07T18:07:46Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[1Q_-_Rotational_Dynamics|1Q - Rotational Dynamics]] 
PIRA index: 1Q50.21

==Description==
The bicycle wheel is rotating rapidly and is hanging from a rope attached to a rod protruding from the wheel's center. The wheel begins to torsionally rotate.

==Equipment==
*bicycle wheel and motor
*c-clamp and power for the motor
*rope

==Instructions==
Spin the bicycle wheel using the motor then let it hang from the rope. The wheel will stay upright and rotate torsionally.

==Keywords==
bicycle, wheel, torsional, rotation, gyroscope

==Images & Movies==
<gallery>
File:1Q40.30_1.JPG|Figure1
</gallery>

{{#widget:YouTube|width=600|height=337|id=_enYKPKVu2g}}

Briefcase with flywheel inside

2021-06-07T18:06:00Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[1Q_-_Rotational_Dynamics|1Q - Rotational Dynamics]] 
PIRA index: 1Q50.40

==Description==
A spinning disc hidden inside a briefcase is spun rapidly. The briefcase is then rotated slowly to show how it responds to the angular momentum of the disc. The disc is also known as a flywheel.

==Equipment==
*briefcase
*cordless drill with drill bit

==Instructions==
Use the drill to rapidly rotate the flywheel hidden inside the briefcase. Hand the briefcase to a student and have the student rotate it back and forth and demonstrate its dependence on angular momentum.

==Keywords==
flywheel, briefcase, drill

==Images & Movies==
<gallery>
File:1Q50.40_1.JPG|Figure1
File:1Q50.40_2.JPG|Figure2
</gallery>


{{#widget:YouTube|width=600|height=337|id=0LtFu3OZGno}}

Bicycle wheel as spinning top

2021-06-02T22:21:30Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[1Q_-_Rotational_Dynamics|1Q - Rotational Dynamics]] 
PIRA index: 1Q40.30

==Description==
A large bicycle wheel works as a spinning top, staying upright by conservation of rotational energy.

==Equipment==
*bicycle wheel and motor
*c-clamp and power for the motor

==Instructions==
Spin the bicycle wheel using the motor and then lay it horizontally on the floor on its handle. It should stay upright and spinning.

==Keywords==
bicycle, wheel, top, spin

==Images & Movies==
<gallery>
File:1Q40.30_1.JPG|Figure1
</gallery>


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Hinged stick and ball

2021-06-02T22:18:46Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[1Q_-_Rotational_Dynamics|1Q - Rotational Dynamics]] 
PIRA index: 1Q20.50

==Description==
A ball on the end of a hinged stick falls into a cup mounted on the stick. Also known as "faster than gravity" or "falling chimney".

==Equipment==
*wooden pieces attached with the hinge
*stick
*ball
*bubble level (optional)

==Instructions==
Use the stick to separate the two pieces of wood at an angle and place the ball on top of the tee. Swiftly remove the stick by grabbing or hitting it and the ball should fall directly into the cup as the two pieces of wood collide.

==Keywords==
hinged stick, ball, cup, faster than gravity, falling chimney

==Images & Movies==
<gallery>
File:1Q20.50_1.JPG|Figure1
File:1Q20 50 3-1.JPG|Figure2
File:1Q20_50_5.JPG|Figure3
</gallery>
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Basketball with tennis ball

2021-06-02T22:16:13Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[1N_-_Linear_Momentum_and_Collisions|1N - Linear Momentum and Collisions]] 
PIRA index: 1N30.60

==Description==
A tennis ball is sitting atop a basketball and both balls are dropped. A large recoil force from the basketball launches the tennis ball high in the air shortly after impact.

==Equipment==
*Basketball
*Tennis ball

==Instructions==
Have the tennis ball directly above and touching the basketball. Drop both balls from waist-height.

==Keywords==
basketball, drop, tennis, ball

==Images & Movies==
<gallery>
File:1C20.15_1.JPG|Figure1
</gallery>
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Balloons

2021-06-02T22:15:00Z

Srobinea: /* Images & Movies */

__NOTOC__

Back to [[1N_-_Linear_Momentum_and_Collisions|1N - Linear Momentum and Collisions]] 
PIRA index: 1N22.25

==Description==
An inflated balloon will fly in a random pattern as it is released.

==Equipment==
*balloons (various shapes/sizes)
*strong lungs

==Instructions==
Inflate a balloon to desired size and let it fly!

==Keywords==
balloon, random pattern, random motion

==Images & Movies==
<gallery>
File:1N22.25_1.JPG|Figure1
</gallery>

Lever level

2021-06-02T22:12:09Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1M_-_Work_and_Energy|1M - Work and Energy]] 
PIRA index: 1M20.40

==Description==
A lever level shows how forces can be balanced depending on their position along the lever.

==Equipment==
*rod and table attachment
*lever level
*set of masses

==Instructions==
Attach the lever level to the vertical rod. Place masses along the various positions on the lever and show how forces are balanced.

==Keywords==
lever, balance, level

==Images & Movies==
<gallery>
File:1M20.40_1.JPG|Figure1
</gallery>

Lever Level - All manipulations

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Lever Level - 1

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Lever Level - 2

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Lever Level - 3

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Lever Level - 4

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Lever level

2021-06-02T22:11:26Z

Srobinea: /* Images & Movies */

Heavy bucket and rope friction

2021-06-02T22:07:59Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1K_-_Applications_of_Newton%27s_Law|1K - Applications of Newton's Law]] 
PIRA index: 1K20.71

==Description==
A heavy bucket is suspended from a rod by multiple turns of a rope and does not lower. As the number of turns of the rope is decreased, the bucket will begin to lower.

==Equipment==
*rods attachment
*bucket
*masses
*rope

==Instructions==
Attach the rope to the handle of the bucket. Tie the rope around the rods attachment using several turns then fill the bucket with the masses. The bucket will not lower due to the rope friction around the rods. As the number of turns is reduced, the bucket will begin to lower. Also known as a capstan.

==Keywords==
capstan, bucket, masses, rope, turns, friction

==Images & Movies==
<gallery>
File:1K20.71_1.JPG|Figure1
File:1K20.71_2.JPG|Figure2
</gallery>

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Tightrope walker

2021-06-02T22:01:15Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1J_-_Statics_and_Rigid_bodies|1J - Statics and Rigid bodies]] 
PIRA index: 1J20.45

==Description==
A metal disc is balanced on either side by small masses and rolls down a rope. This simulates a tightrope walker using a long pole to balance himself. 
Also known as a '''funambule''' in french.

==Equipment==
* Tightrope walker
* String
* Two c-clamps with rods

==Instructions==
Attach a taut string between two rods at a small angle (15 - 30°). Place the tightrope walker at the highest point of the string and watch it travel down.

==Keywords==
tightrope, walker, funambule, balance, center, mass, gravity, rope, disc

==Images & Movies==




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Balanced hammer and arc

2021-06-02T21:57:31Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1J_-_Statics_and_Rigid_bodies|1J - Statics and Rigid bodies]] 
PIRA index: 1J20.30

==Description==
A hammer is balanced on an arc of metal which is held by the demonstrator's finger. Also known as the skyhook.

==Equipment==
*hammer
*metal arc

==Instructions==
Place the arc into the hammer's forked side. Balance the flat end of the arc on your finger. (see images and movies)

==Keywords==
skyhook, hammer, arc, balanced, center of mass

==Images & Movies==
<gallery>
</gallery>

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Center of mass of irregular objects

2021-06-02T21:56:29Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1J_-_Statics_and_Rigid_bodies|1J - Statics and Rigid bodies]] 
PIRA index: 1J20.20

==Description==
The center of mass of irregular objects is used to balance these objects in precarious positions.

==Equipment==
*utensils and glass
*eagle and cone

==Instructions==
Balance the utensils arrangement on the edge of the glass. Balance the eagle's beak on the tip of the inverted cone.

==Keywords==
center, mass, irregular, object

==Images & Movies==
<gallery>
File:1J20.20_correct.jpg|Figure1
</gallery>


Center of mass of irregular objects -- bird1
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Center of mass of irregular objects -- bird2
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Center of mass of irregular objects -- spoon fork
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Cardboard box

2021-06-02T21:53:21Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1J_-_Statics_and_Rigid_bodies|1J - Statics and Rigid bodies]] 
PIRA index: 1J10.09

==Description==
A cardboard box is thrown and spun in the air to show rotation around it's center of mass.

==Equipment==
*cardboard box

==Instructions==
Throw the cardboard box in the air with a strong spin. Watch the box rotate around its center of mass while in the air.

==Keywords==
cardboard box, rotation, center, mass

==Images & Movies==
<gallery>
</gallery>

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Cup and weights

2021-06-02T21:48:36Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1G - Newton's Second Law]] 
PIRA index: 1G20.40

==Description==
Hang 2 x 200 g weights from heavy rubber bands extending from the center over the edge of a styrofoam bucket with a 200g under the cup to keep the balance. Drop the thing.

==Equipment==
*styrofoam cup
*Two identical weights
*Rubber band

==Instructions==

==Keywords==
acceleration, cup, weight, rubber band, styrofoam cup

==Images & Movies==
<gallery>
File:1G20.40 01.JPG|Figure1
</gallery>

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Tablecloth and dishes

2021-06-02T21:46:42Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1F_-_Newton%27s_First_Law|1F - Newton's First Law]] 
PIRA index: 1F20.30

==Description==
A tablecloth is quickly pulled from underneath a beaker filled with water. The beaker does not topple over due to inertia.

==Equipment==
*4 L beaker filled with water
*Tablecloth
*Flat surface

==Instructions==
Lay the tablecloth flat on the table and place the filled beaker on top of it. Swiftly pull the tablecloth off the table and the beaker should remain in place.

==Keywords==
tablecloth, napkin, beaker, water, dishes

==Images & Movies==
<gallery>
File:1F20.30_1.JPG|Figure1
</gallery>
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Parabolic trajectory on incline

2021-06-02T21:45:14Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D60.55

==Description==
A ball that is fired up an incline follows a parabolic trajectory. The steepness of the incline can be adjusted.

==Equipment==
*Inclined plane
*Ball bearing

==Instructions==
1) Set the desired incline for the plane 
2) Set the desired angle of fire and launch the ball bearing 

==Keywords==
ball, incline, parabolic, trajectory

==Images & Movies==
<gallery>
File:1D60.55_1.JPG|Figure1
File:1D60.55_2.JPG|Figure2
</gallery>


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Lighter mass lifting heavier mass

2021-06-02T21:41:15Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D50.20

==Description==
Similar to a whirligig, this demonstration shows how a lighter mass can lift a heavier mass using tension in a string.

==Equipment==
*2 masses
*string
*pulleys, rods, and c-clamps setup

==Instructions==
Set up the pulleys, rods, and c-clamps as shown in the image. Thread the string through the pulleys and attach it to each end of a masses. Lightly swing the smaller mass in order to lift the heavier one off the table.

==Keywords==
light mass, lift, heavy mass

==Images & Movies==
<gallery>
File:1D50.20_1a.JPG|Figure1
</gallery>

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Whirligig

2021-06-02T21:38:52Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[1D_-_Motion_in_two_dimensions|1D - Motion in two dimensions]] 
PIRA index: 1D50.20

==Description==
A light ball and heavy mass are attached together by a string in a clear tube. When the lighter ball is spun around, it lifts the heavier mass.

==Equipment==
*Whirligig (ball (6.5g) and mass (50g) attached by string in clear tube)

==Instructions==
With the lighter ball on top, start spinning the whirligig slowly. The tension in the string will cause the heavier mass to rise.

==Keywords==
ball, mass, 50g, tube, spin, lift, acceleration, tension

==Images & Movies==
<gallery>
File:1D50.20_1.JPG|Figure1
</gallery>


Wooden ball with mass

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Wooden ball release

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Tennis racket rotation

2021-06-02T21:24:01Z

Srobinea: /* Images & Movies */

Drinking bird

2021-06-02T18:16:44Z

Srobinea:

__NOTOC__
Back to [[4C - Change of state|4C - Change of state]] 
PIRA index: 4C31.30

==Description==
The drinking bird is a heat engine. It is made of two connected glass bulbs filled with dichloromethane and installed on the rim of a container filled with water. The evaporation of the water on the 'head' will lower the pressure inside suck the liquid in the head, tipping the bird into the water. Once the pressure and temperature inside are back to equilibrium, the bird's head goes back up and new water starts to evaporate and the process starts again.

==Equipment==
* Drinking bird
* Glass of water

==Instructions==
Put drinking bird on the rim of the glass (or next to it depending on the design). As long as there is water, it will tip back and forth.

==Keywords==
heat engine, evaporation, water, hypnosis

==Images & Movies==

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Drill and piece of metal

2021-06-02T18:01:35Z

Srobinea:

__NOTOC__
Back to [[4B - Heat and the first law|4B - Heat and the first law]] 
PIRA index: 4B60.50

==Description==
Drilling holes produces heat by friction

==Equipment==
* Block of metal
* Drill with aprropriate drill bit
* Thermocouple or infrared thermometer

==Instructions==
Drill in the piece of metal. Monitor temperature

==Keywords==
friction, drill

==Images & Movies==

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Melting wax

2021-06-02T17:57:44Z

Srobinea:

__NOTOC__
Back to [[4B - Heat and the first law|4B - Heat and the first law]] 
PIRA index: 4B10.30

==Description==
Multiple rods of different thermal conductivities are connected to a central metal piece. When heated, those metal conduct heat at different rate, demonstrated by placing balls of wax at the extremities of each rods and heating the center.

==Equipment==
* Multiple rod thingy
* Paraffin
* Heat source (torch, lighter, candle, etc.)
* Water in a container + brown paper

==Instructions==
Place the central part over the heat source. Wait and note the order at which each ball of paraffin start to melt. Once every ball has started melting, turn off the heat source and place the apparatus in water to cool it off and then dry it.

==Keywords==
* heat conduction, wax, metal

==Images & Movies==

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Ball and ring

2021-06-02T17:52:47Z

Srobinea: /* Images & Movies */

__NOTOC__
Back to [[4A - Thermal properties of matter|4A - Thermal properties of matter]] 
PIRA index: 4A30.20

==Description==
A metal ball has a diameter barely small enough to go through a ring at room temperature. When heated, the ball is too big to fit in the ring. One version of this demo has the ball resting on the ring and will eventually go through when its temperature is low enough.

==Equipment==
* A matching ball and ring set

==Instructions==
With all the objects at room temperature, show that the ball can go through the ring. Heat the ball. Show that ball is unable to go through the same hole. One version of this demo allows you to leave the ball on the ring (while you continue with the lecture), it will take a few minute to cool down enough to let the ball through.

==Keywords==
ring, ball, thermal expansion, temperature.

==Images & Movies==


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