A brick initially has its face with the largest area in contact with a rough sur

Question

A brick initially has its face with the largest area in contact with a rough surface, as shown in the figure below, on the left. A force F_1 is required to pull the brick along the surface at constant speed. The same brick is now flipped (as shown in the figure above, on the right) so that a face of smaller area is in contact. The material of the brick is uniform on all faces. What must be true of the force, F_2, which is now required to pull the brick along at constant speed as before? F_2 F_1 F_2 = 0. We need more information.

Explanation / Answer

in this case, the weight of the brick does not change and it moves with constant speed, so the force in two cases remains the same. The force exerted on the brick in each case does not depends on the contact area. Therefore, we get the relatin, F1 = F2. Therefore, option B is correct.

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