1K20.30 Static vs. Sliding Friction

1K20.30 Static vs. Sliding Friction

Set a block with an eye hook (or a cart with the wheels locked) on a regular, smooth surface and connect a spring scale to it with a piece of string. Begin to pull on the scale, gradually increasing the force applied, until the tension overcomes friction and the block moves. For the best results, anticipate when this will occur and try to minimize acceleration at that point.

A rectangular wooden block is set on a piece of particle board, largest side down. Of the two large sides, the bottom side is smooth. The top side is cushioned. A lead brick sits on the cushioned side. A spring scale is hooked to a string fastened to a hook screwed into one short side of the block. The scale is being pulled at a slight angle with respect to the horizontal and reads 20 N.

Slide block on particle board surface for best results.

 

Location: B4-4