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Question

A block, placed on a horizontal table, just starts moving when the applied horizontal force is 5 N. What can we say about the magnitude of friction acting on the block once it starts moving?

A
5 N
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B
0 N
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C
Less than 5 N
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D
Greater than 5 N
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Solution

The correct option is C Less than 5 N
Here, the maximum value of static friction between the block and the table is 5 N. Once the block start sliding, kinetic friction will come into play. As kinetic friction is less than static friction, its value will be less than 5 N.

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