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A box is placed on an inclined plane and has to be pushed down. The angle of inclination is :

1. Equal to the angle of friction
2. More than the angle of friction
3. Equal to the angle of repose
4. Less than the angle of repose

Correct answer: More than the angle of friction

Solution

A box will move down the plane only when the component of its weight along the plane exceeds the maximum static friction. That requires the inclination angle to be greater than the angle of friction, since at equality the body is just on the verge of slipping.

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