Please please pleasee help me out! A block is connected to a weight through a ma

Question

Please please pleasee help me out!

A block is connected to a weight through a massless rope, which goes over a pulley. The block is given an initial push, so that it slides along the table to the right. There is friction between the block and the table. The mass of the hanging weight is larger than the mass of the block. The figure below shows the block while it is still moving to the right and the free body diagrams for the weight and the block.

Some students discuss the free-body diagrams.

Alice: “I see a problem in the diagram for the weight. The two forces should have the same magnitude.”

Bob:   “But the weight is moving upward – there should be a greater force in that direction.”

Carlo: “No, that diagram is ok, but there is a problem with the diagram for the block. The frictional force is in the wrong direction.”

David: “Both diagrams are correct, because they show the way both objects would be accelerating.”

Who do you agree with? Explain your reasoning.

Explanation / Answer

i will agree with Carlo as he is correct, free body diagrams are oke except the direction of friction as friction will opose relative motion between surfaces in contact.

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