018 Phys211 S10 Momentum

018 Phys211 S10 Momentum - 3/1/2010 1 1 Momentum Phys211...

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3/1/2010 1 Momentum Phys211 Spring 2010 3/02/10 Essential University Physics, J. Wolfson 1 1 3/02/10 Momentum When dealing with systems of objects, or with objects that cannot be called point-like, center of mass motion becomes important. Force relates to center of mass acceleration. Momentum relates to center of mass velocity. cm i net ext p mv P Mv p dP dP FF dt dt i i i i cm cm m v m a va MM Essential University Physics, J. Wolfson 2 3/02/10 Question 1 The standard unit for momentum is: A. m/s B. kg . m/s C. kg . m 2 /s D. kg . m/s 2 E. kg . m 2 /s 2 Essential University Physics, J. Wolfson 3
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3/1/2010 2 3/02/10 Question 2 If the net external force is zero, but there are still plenty of forces within the system, then the system’s total momentum A. Changes in the direction of the internal force B. Changes opposite the direction of the internal force C. Is zero D. Is constant, but not necessarily zero E. Not enough information Essential University Physics, J. Wolfson 4 3/02/10 Momentum Conservation
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018 Phys211 S10 Momentum - 3/1/2010 1 1 Momentum Phys211...

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