Rotation 5 Question 21
33. A uniform cube of side and mass rests on a rough horizontal table. A horizontal force is applied normal to one of the faces at a point that is directly above the centre of the face, at a height above the base. The minimum value of for which the cube begins to tip about the edge is (Assume that the cube does not slide).
True / False
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Answer:
Correct Answer: 33.
Solution:
- Taking moments about point
Moments of (normal reaction) and (force of friction) are zero. In critical case normal reaction will pass through . To tip about the edge, moment of should be greater than moment of . Or,