The figure on the right shows two forces, F_1 and F_2 acting on a disk that turn

Question

The figure on the right shows two forces, F_1 and F_2 acting on a disk that turns about its center like a merry go round. The forces maintain the indicated angles during the rotation, which is counter-clockwise and at a constant rate. Suppose you now want to decrease the angle theta of F_1 without changing the magnitude of F_1 and without changing the constant angular velocity of the disk. You should Increase the magnitude of F_2 Reverse the direction of F_2 Both increase the magnitude and reverse the direction of F_2 Decrease the magnitude of F_2 No change in F_2 is required

Explanation / Answer

Decreasing reduces the magnitude of the torque caused by F1. And since both torques are opposite to each other so we should decrease the magnitude of F2 to keep the angular velocity constant.

hence the correct option is (D)..

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