(a) A brick slides more easily on ice than on wood. For which combination (brick on ice or brick on wood) is \(\mu_{s}\) larger?

(b) For rubber on dry asphalt, \(\mu_{s}\) is about 1 . Ignoring any limits due to the runner's skill and condition, what maximum acceleration without slipping can a runner achieve using rubber soles on a dry, horizontal asphalt surface? [See Figure 10.21.]

Transcribed Image Text:

Figure 10.21 Two equivalent situations in which an object is accel- erated by static friction. (a) Person steps forward from standstill. (c) Free-body diagram for both systems sp (b) Conveyor belt starts, setting package in motion. F Ep sp x