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Question

# A block of weight 10 N is resting on a horizontal surface. If a person applies a force of 20 N as shown below, then the possible value of frictional force on the block due to surface will be __________.

A
8 N
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B
0 N
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C
10 N
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D
12 N
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Solution

## The correct option is B 0 NIt is given that a block is at rest on a rough horizontal surface. When extra force of 20 N is applied perpendicularly on the block, the block will still be at rest. Here, as no horizontal forces are applied and their is no relative motion between the block and the surface, the frictional force on the block due to the surface will be zero.

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