C6-01
Shows that the coefficient of friction does not depend upon the mass of the object although the frictional force does.

A box sits on an adjustable inclined plane. Masses can be placed in the box to change its weight, and thus the normal force exerted by the inclined plane.

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.

(Optionally, a string and pulley can be used to add add an additional force to the system.)

C6, ME1