Chapter 10287Q10.21The moment of inertia would decrease. This would result in a higher angular speed of the earth,shorter days, and more days in the year!Q10.22There is very little resistance to motion that can reduce the kinetic energy of the rolling ball. Eventhough there is static friction between the ball and the floor (if there were none, then no rotationwould occur and the ball would slide), there is no relative motion of the two surfaces—by thedefinition of “rolling”—and so no force of kinetic friction acts to reduce K. Air resistance and frictionassociated with deformation of the ball eventually stop the ball.Q10.23In the frame of reference of the ground, no. Every pointmoves perpendicular to the line joining it to theinstantaneous contact point. The contact point is notmoving at all. The leading and trailing edges of thecylinder have velocities at 45°to the vertical as shown.P CM vCM vvFIG. Q10.23
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