# Homework help regarding forces of friction and their directions

1. Apr 29, 2007

### MechRocket

The Problem

What I Think

The Correct Solution

What Is Confusing Me

Shouldn't the force of friction on the slab be pointed to the left? I knew the force of friction on the block is pointed to the left (because friction will oppose movement), so I naturally assumed this force to the left also acts on the slab (the two surfaces are touching after all).

I just cannot see why the friction force on the slab is to the right.

Thanks a lot! :)

Last edited: Apr 29, 2007
2. Apr 29, 2007