Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

# Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography

Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

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Choose a subtopic:
Measurement
Motion In One Dimension
Motion In Two Dimensions
Newton's First Law
Newton's Second Law
Newton's Third Law
Statics Of Rigid Bodies
Applications Of Newton's Laws
Gravity
Work and Energy
Momentum
Rotational Motion
Rotational Inertia Rods
video  - Rolling Objects and Moments of Inertia
video  - Moment of Inertia Wheel
video  - The Falling Rigid Body
video  - Vector Nature of Angular Momentum
Hero's engine
video  - Precession of Bicycle Wheel Under Gravity Force
Suitcase Gyro
Air Gyro
Gyrocompass
Gyroscopes
Euler's Disk
Tippe Top
Properties of Matter

### video  - Moment of Inertia Wheel

#### Purpose:

To demonstrate the effects of different distribution of mass about a fixed axis.

#### Procedure:

The wheel is equipped with sliding weights that can be moved along the slots by loosening them with a counter-clockwise twist. Place the free weights on a holder and attach this to the string wound around the axis. Allow the weights to turn the wheel and time their descent with the masses on the wheel in both the close and far away positions.

#### Hints:

• Make sure string is securely attached thru hold on axis of wheel.
• The moment of Inertia of the wheel alone is .17 kg m^2.
• The masses are 1 kg each.
• At the inner position, the masses are 7.0 cm from the center.
• At the outer position, the masses are 29.5 cm from the center.

#### Equipment:

• Timer
• Plexiglass Inertia Wheel
• Stand
• Weight Holder
• Weights