Chapter 5, Problem 9MCP

The System shown a Figure 5.34 is released from test. there is friction between B and the tablelop, and all of the objects move together what must be true about the friction force on A?

Figure 5.34

Multiple-Choice Problem 9.

1. A.    It is zero.
2. B.     It acts to the right on A
3. C.     It acts to the left on A
4. D.    We cannot tell whether there is any friction force on A because we do not know the coefficients of friction between A and B.