Question

A block is placed on top of a block (Fig. above). A horizontal force of is applied to the block, and the block is tied to the wall. The coefficient of kinetic friction between all moving surfaces is . (a) Draw a free-body diagram for each block and identify the actionreaction forces between the blocks. (b) Determine the tension in the string and the magnitude of the acceleration of the block.

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Solution

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(a) The free-body diagrams are shown in the figure below.
    and appear in both diagrams as action-reaction pairs.
(b) For the mass, Newton’s second law in the direction gives:
   
In the direction,
   
   
For the mass, Newton’s second law in the direction gives:
   
In the direction,
   
   
   
   

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