A force of 10 N is applied to a block as shown below. If the block remains stationary, what is the magnitude of static friction acting on the block?
A
10 N
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B
0 N
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C
Less than 10 N
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D
Greater than 10 N
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Solution
The correct option is A 10 N Since the block remains stationary even on application of 10 N force, net force on the block must be zero. This means that a static frictional force of 10 N will act on the block in a direction opposite to that of the applied force.