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Rolling and Using Treads to Change Friction

A wooden bloc...

Question

A wooden block is lying on a horizontal table. A 2 N force is applied to the block in horizontal direction, and still the block remains at rest. What is the force of friction offered by the table?

A

1.8 N

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B

2 N

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C

2.2 N

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D

0 N

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Solution

The correct option is B 2 N
The block doesn't move. This implies that the net force on the block in horizontal direction is zero. Therefore, the table must apply 2 N force on the block in a direction opposite to applied force.

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