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.

 Choose a Topic or Enter a keyword to search: I cannot find what I want! You have selected the following Demos: None Selected

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
Potential Energy
Simple Machines
video  - Inclined Plane
Human Lever Arm
video  - Conservative System
video  - Pendulum with Moveable Peg
video  - Loop - the - Loop
Ball in Curved Tracks
Maxwell's Wheel (Yo-Yo)
Work Done by a Compressed Spring
video  - Work Done on a Cart
Energy Conversion and Conservation
Momentum
Rotational Motion
Properties of Matter

### Work Done by a Compressed Spring

#### Purpose:

To verify quantitatively the work done when a compressed spring is released.

#### Procedure:

Slide 0.192kg travel car into launcher car and secure launch lever. Measure spring displacement. While holding launcher car in place, launch travel car. Note velocity on computer display. The Capstone software calculates speed by measuring time it takes car's 1cm wide flag to go thru photogate. Measure spring constant of launcher by hanging weights on the spring and noting the displacement.

Quantitatively here are some numbers:
Mass of the Travel Cart = 0.192kg
Cart Velocity = 1.15m/s
Spring Constant = 28.6N/m
Spring Compression = 0.095m
with these numbers we get conservation of energy within 2%

#### Hints:

Use Capstone experiment file "Work_Done_by_Compressed_Spring.cap". Single photogate plugs into Digital Channel #1.

#### Equipment:

• Timer
• Air Track
• Gliders w/ spring attachment
• Weights