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285_Physics ProblemsTechnical Physics

# 285_Physics ProblemsTechnical Physics - Chapter 10 287...

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Chapter 10 287 Q10.21 The moment of inertia would decrease. This would result in a higher angular speed of the earth, shorter days, and more days in the year! Q10.22 There is very little resistance to motion that can reduce the kinetic energy of the rolling ball. Even though there is static friction between the ball and the floor (if there were none, then no rotation would occur and the ball would slide), there is no relative motion of the two surfaces—by the definition of “rolling”—and so no force of kinetic friction acts to reduce K . Air resistance and friction associated with deformation of the ball eventually stop the ball. Q10.23 In the frame of reference of the ground, no. Every point moves perpendicular to the line joining it to the instantaneous contact point. The contact point is not moving at all. The leading and trailing edges of the cylinder have velocities at 45 ° to the vertical as shown. P CM v CM v v FIG. Q10.23
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