1K20.13 Friction Blocks

1K20.13 Friction Blocks

A spring scale is attached to a wooden block which rests atop a device with a sliding surface. Show that the coefficient of friction is independent of speed.

A belt sander is clamped in a vise and set upside-down on a cart. The belt sander is then hooked up to a Variac. A scrap block of pine wood is set on the sander, with a 1-kg mass on top. One side of a dial-style spring scale is hooked directly to the block. The other side of the spring scale is hooked to a post such that the scale is slung horizontally. The scale reads 4 N.

 

Location: Block: B4-4; Belt Sander: Woodshop