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A rectangle block rests on a horizontal ...

A rectangle block rests on a horizontal table. A horizontal force is applied on the block at a height h above the table to move the block. Does the line of action of the normal force N exerted by the table on block depend on h?

Text Solution

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(i) Yes. The line of action of the normal force N exerted by the table on the block depend on h.

(ii) When height of the applied force 'h' increases, a torque is produced by the applied force and frictional force such that block start to tilt.
(iii) To balance this effect, line of action of normal force shift away from applied force and make a opposite torque, joining with gravitational force 'W'.
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