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.
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