Demonstrates how rotational friction affects the efficiency of popular machine elements, including screw jack, a wedge and different bearings.

Demonstrates simple harmonic motion (oscillation) in springs and pendulums, and its usefulness.

Demonstrates kinetic and static sliding friction and rolling friction on bodies and between different surfaces on a flat or inclined plane.

Demonstrates the difference between potential and kinetic energy and how it can change from one to the other using a pendulum or flywheel. Also demonstrates elastic potential energy in a spring.