A variety of mechanical concepts are illustrated by using different setups. Necessary parts can be magnetically attached to the blackboard.
- 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)
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.
Inclined planes, friction, force directions, and center of mass can all be illustrated with these demos.
- 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