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# A 20 j b 20 j c 40 j d 40 j e 10 j a force does work

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Unformatted text preview: J D. +40 J E. +10 J A force does work on an object if a component of the force A. is perpendicular to the displacement of the object. B. is parallel to the displacement of the object. C. perpendicular to the displacement of the object along a path that returns the object to its starting position. D. parallel to the displacement of the object along a path that returns the object to its starting position. E. Not covered in the assigned reading. An object is moving in a circular path at constant speed. Force F is acting on it to keep it moving this way. Does the force do work on the object? A. Yes, since a force acts and the object moves, and work is force times distance. B. Yes, since it takes energy to turn an object. C. No, because the object has constant speed. D. No, because the object has constant velocity. E. None of these is true. A 10-kg mass is sliding on a frictionless surface to the right with a speed of 4 m/s. How much work would be required to reverse the direction of the mass so that it moves to the left with a speed of 4 m/s? A. +160 J B. +80 J C. 0J D. -160 J E. Not covered in the assigned reading. 4. 5. 6. Distributed By: Tyrone G Carter TGC Physics Honors Distributed By: Tyrone G Carter 7. Consider two masses at the top of two frictionless inclined planes. Both masses start from rest at the...
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## This note was uploaded on 08/29/2010 for the course PHYS 38234 taught by Professor Ramesh during the Spring '09 term at Berkeley.

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