PIRA Code(s): 1M20.10
Set up time:none
Operation: These may be used by themselves or with other demonstrations.
Physics and Science Concepts: Mechanics, Mechanical Advantage, Simple Machines
Safety: None

PIRA Code(s): 1M20.30
Set up time:5 minutes
Operation: Set the empty friction box on the incline with weights attached to the string on the other side of the pulley so that the box slides forward. Then, gradually increase the angle of the plane until the box and the weights reach equilibrium.
Physics and Science Concepts: Equilibrium of forces, Mechanics, Work and Energy
Safety: None