hw

Review today's problems - make sure that they make pretty good sense to you.

Try these:

Chapter 8:  63, 67, 88

Note that the work done by friction (W = F x) can be given by:  W = f x, where f is friction force.  And recall that coefficient of friction (u) is given by:  f = u N  (friction force = coefficient x normal force)

Read chapter 8:6 and note equation 8-22.