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A rod AB rest...

Question

A rod AB rests with the end A on rough horizontal ground, such that end A is prevented from sliding to the right. End B rests on smooth vertical wall. The rod is uniform and its weight is W. If the rod is in a stationary position as shown in figure, the number of forces acting in the FBD of rod is/are

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Solution

The direction of normal reaction at points A and B is taken perpendicular to the wall/ground and pushing outwards. Forces at A and B are shown in the figure. Note that the force (f_A) at A is to the left as this point tends to move to the right.

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