07_P34InstructorSolution - 7.34. Model: Blocks 1 and 2 make...

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7.34. Model: Blocks 1 and 2 make up the system of interest and will be treated as particles. Assume a massless rope and frictionless pulley. Visualize: Solve: The blocks accelerate with the same magnitude but in opposite directions. Thus the acceleration constraint is 21 , aa a == where a will have a positive value. There are two real action/reaction pairs. The two tension forces will act as if they are action/reaction pairs because we are assuming a massless rope and a frictionless pulley. Make sure you understand why the friction forces point in the directions shown in the free- body diagrams, especially force 1 f G exerted on block 2 by block 1. We have quite a few pieces of information to include. First, Newton’s second law for blocks 1 and 2: () net on 1 1 1 k 1 1 1 1 1 x Ff T n T m a m a μ =−= −= = G ( ) net on1 1 1 1 1 0 N y Fn m g n m g
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