The humble pegboard can be used in a variety of ways. An all pegboard Rube Goldberg. Demonstrating the Cartesian graphing system. The limit to the usefulness of this board of holes is hard to measure.
Pegboard Rube Goldberg
Simple construction with 2×4’s and 4 2’x4′ Pieces of pegboard.
The lesson can be as simple as dominoes on inclined planes.
Watch this for an animation of virtual dominoes
Or use whatever you can find around the garage.