Rotation 5 Question 7

17. A cubical block of side L rests on a rough horizontal surface with coefficient of friction μ. A horizontal force F is applied on the block as shown. If the coefficient of friction is sufficiently high, so that the block does not slide before toppling, the minimum force required to topple the block is

(2000)

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Answer:

Correct Answer: 17. (c)

Solution:

  1. At the critical condition, normal reaction N will pass through point P. In this condition, τN=0=τfr( about P) the block will topple when

τF>τmg or FL>(mg)L2F>mg2

Therefore, the minimum force required to topple the block is

F=mg2



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