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PIRA Code(s)
Set up time
2 minutes
Physics and Science Concepts
Friction, Angle of Repose, Mechanics, Coefficient of Friction
Set the empty box on the incline and increase the angle until sliding ensues. Add weights to the box and repeat the experiment. The weighted box begins to slide at the same angle.

A friction box can be filled with various weights and placed on an inclined plane. The angle that the box begins to slide should not change as weights are added because the coefficient of friction does not depend on the mass of the object.