PHY 121 Ch 10 Lecture

PHY 121 Ch 10 Lecture - Lecture 18 Thursday, March 27 1 A...

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1 Lecture 18 Thursday, March 27
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2 A force is applied to an object in such a way that it produces a torque. A. The torque is parallel to the force and points in the same direction. B. The torque is parallel to the force but points in the opposite direction. C. The torque is perpendicular to the force. D. Not enough information to tell the direction of the torque.
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3 The rotational analog of Newton’s second law A. states that the net torque is equal to the moment of inertia times the angular acceleration. B. states that the moment of inertia is proportional to the mass. C. states that the total kinetic energy is the translational center of mass kinetic energy plus the rotational energy. D. states that power is equal to torque times angular velocity.
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4 A spherical ball of radius R rolls with angular velocity ω along a surface. Its center of mass moves horizontally with velocity v cm. A. v cm = ω R only if the ball rolls without slipping. B. v cm = ω R under all circumstances. C. v cm > ω R if there is some slipping. D. there is in principle no relationship between the angular and translational velocities.
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Rolling friction: A. is the necessary friction force that induces the rotation. B. is independent of the normal force.
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PHY 121 Ch 10 Lecture - Lecture 18 Thursday, March 27 1 A...

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