JEE Advanced 2008 Physics question

Physics Laws of Motion JEE Advanced 2008

STATEMENT-1 : It is easier to pull a heavy object than to push it on a level ground. and STATEMENT-2 : The magnitude of frictional force depends on the nature of the two surfaces in contact.

(A)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is a correct explanation for STATEMENT-1
(B)STATEMENT-1 is True, STATEMENT-2 is True; STATEMENT-2 is NOT a correct explanation for STATEMENT-1Correct
(C)STATEMENT-1 is True, STATEMENT-2 is False
(D)STATEMENT-1 is False, STATEMENT-2 is True

Answer: (B)

Solution

When pulling with a force inclined upward, its vertical component reduces the normal reaction and hence the friction; when pushing at a downward angle, the normal reaction and friction increase. So pulling is easier:

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Question ID VK-037637