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Friction

Two blocks of...

Question

Two blocks of same material are resting on a smooth surface, what will be the correct relations of friction force acting on them?

F1 and F2 represent the frictional force for blocks 1 and 2 respectively.

A

F1 > F2

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B

F1 < F2

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C

F1 = F2 = 2 N

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D

F1 = F2 = 0 N

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Solution

The correct option is C F1 = F2 = 2 N
Free body diagram:

Block 1 :

Block 2:

The friction force is independent of the area of contact. The weight of both blocks is the same. i.e normal force is the same in both the blocks. From the free body diagram,

we can say that F1 = F2 = 2 N

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