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# T2 B - Physics 1408 Test 2B Name 1(1 In which one of the...

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Physics 1408 Test 2B (03/28/08) Name___________________ 1. (1). In which one of the following situations is zero net work done? (a) A ball rolls down an inclined plane. (b) A physics student stretches a spring. (c) A projectile falls toward the surface of Earth. (d) A box is pulled across a rough floor at constant velocity. (2). Two objects of equal mass traveling toward each other with equal speeds undergo a head on collision. Which one of the following statements concerning their velocities after the collision is necessarily true? (a) They will exchange velocities. (d) Their velocities will be zero. (b) Their velocities will be reduced. (c) Their velocities may be zero. 2. (1). A hollow cylinder of mass M and radius R rolls down an inclined plane. A block of mass M slides down an identical inclined plane. Complete the following statement: If both objects are released at the same time, (a) the cylinder will reach the bottom first. (b) the block will reach the bottom first. (c) the block will reach the bottom with the greater kinetic energy. (d) the cylinder will reach the bottom with the greater kinetic energy.

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