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Third Law of Motion

Two blocks pl...

Question

Two blocks placed on each other. Force F is applied on lower block . Then what happens to upper block the moment lower block moves. Assume that all surfaces are frictionless.

A

Block doesn't move forward and falls off .

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B

Falls off after moving forward for sometime

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C

Block moves in forward direction

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D

Upper block moves alongwith lower block.

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Solution

The correct option is A
Block doesn't move forward and falls off .

When force is applied on the lower block, force of friction between upper and lower block causes the upper block to move in backward direction and thus it falls off.

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