Force Times Time At the local hockey rink, a puck with a mass of 0.12 kg is given an initial speed of v0 = 6.7 m/s. (a) If the coefficient of kinetic friction between the ice and the puck is 0.13, how much time f does it take for the puck to come to rest? (b) If the mass of the puck is doubled, does the frictional force F exerted on the puck increase, decrease, or stay the same? Explain. (c) Does the stopping time of the puck increase, decrease, or stay the same when its mass is doubled? Explain. (d) For the situation considered in part (a), show that Ft = mv0. (The significance of this result will be discussed in Chapter 9, where we will see that mv is the momentum of an object.)
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