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COM of Center of Masses

A person appl...

Question

A person applies a force of 20 N horizontally on a cube of weight 30 N, but it does not move at all. Identify the type of frictional force and also draw its free body diagram (FBD).

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Solution

As the block is not moving, the muscular force of 20 N is balanced out by static friction between the cube and the surface.
So free body diagram will be as follows.

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