If you want to know the friction coefficient for a block on a surface. 1. Put the block on the horizontal surface 2. Raise one end of the surface. record the angle (cta) when the block starts moving 3. the friction coefficient = tan(cta) Drag the slider on the left to change the angle of the ramp.

Virtual Physics laboratory Original URL

Fu-Kwun Hwang, Dept. Of Physics, National Taiwan Normal University.