Blackboard mechanics full kit

A variety of mechanical concepts are illustrated by using different setups. Necessary parts can be magnetically attached to the blackboard.

Equipment:

• 6x 1N weights
• 2x Newton scales
• Inclined plane with bob and protractor
• Magnetic arrows to show forces
• Single pulley
• Double pulley
• Adjustable lever balance
• Metal block with teflon on one side
• 2x metal wheels
• Video camera (if necessary)

Demos:

1. Friction with pulley: Attach a block to a weight on a string, observe the angle at which the block begins to slide (or the weight at which the block stops sliding).

2. Basic inclined plane: Attach a rolling cylinder to a weight on a string. Observe the effect of heavier or lighter weights.

3. System of pulleys

4. Resolution of forces into x and y components: A force is created at an angle to the horizontal via a mass on a string over a pulley. The forces can be resolved into x and y components.

5. Balancing of a lever: A long, thin, metal strip is balanced on a fulcrum by attaching different weights to different points on the strip.

Explanation:

Inclined planes, friction, force directions, and center of mass can all be illustrated with these demos.

Notes:

• If done in a classroom with a document camera, the camera can be angled backwards towards the blackboard, and the class will easily be able to see all of the demos.
• Colorful braided string stays on the pulley the best
• To balance 5N roller, use X 1N weight + 1X 20g weight (inclined plane)
• Use 20g weight attached to thin nylon string as a plumb bob
• Double hooked weights are 1N each