ch05-p053 - 53. The free-body diagrams for part (a) are...

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53. The free-body diagrams for part (a) are shown below. G F is the applied force and G f is the force exerted by block 1 on block 2. We note that G F is applied directly to block 1 and that block 2 exerts the force G f on block 1 (taking Newton’s third law into account). (a) Newton’s second law for block 1 is F f = m 1 a , where a is the acceleration. The second law for block 2 is f = m 2 a . Since the blocks move together they have the same acceleration and the same symbol is used in both equations. From the second equation we obtain the expression a = f / m 2 , which we substitute into the first equation to get F f = m 1 f / m 2 . Therefore, f Fm mm = + = + = 2
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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