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

### video  - Inclined Plane

#### Purpose:

To illustrate the mechanical advantage gained by use of an inclined plane.

#### Procedure:

DEMO VIDEO DOWNLOAD / no audio / 1920x1080 / 24.19Mb/s / 342MB size

DEMO VIDEO DOWNLOAD / no audio / 854x480 / 5.69Mb/s / 79MB size

A wheeled cart is placed on an inclined plane with adjustable angle and attached angle meter. A string is attached to the cart and fed over a pulley to a spring scale. The cart is pulled up the ramp with constant velocity to a prescribed height. During this time, the constant force required to lift the cart is read off the scale. A horizontal bar is placed behind the ramp to identify the height through which the cart is pulled. Measure the distance through which the cart was pulled. Next, adjust the angle of the ramp and pull the cart up to the same height as before and record the force required and the distance pulled. The calculated work done in each case should be the same even though the forces and distances are different.

Height for both cases below:    h = 21.2cm

• CASE#1:    Angle = 20o    L20 = 62.0cm     F = 5.5N    W = 3.4Nm
• CASE#2:    Angle = 30o    L30 = 42.4cm     N = 8.0N    W = 3.4Nm