Question

# A wooden block kept on concrete was initially at rest. When a force of 20 N acts on it, the block starts to move in the direction of force. Which of the following is correct for the friction on the block when it is moving?

A
Static friction of magnitude 20 N
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B
Static friction of magnitude less than 20 N
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C
Sliding friction of magnitude 20 N
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D
Sliding friction of magnitude less than 20 N
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Solution

## The correct option is D Sliding friction of magnitude less than 20 NSince, it is given that the block is sliding and not at rest, therefore we can conclude that sliding friction is acting on it. If the block would have been at rest even after the application of 20 N. We could have said that a static friction of 20 N was acting on it. But, the block is moving which means the value of static friction would have been less than 20 N. And, we know that the magnitude of sliding friction is less than the maximum static friction. Hence, the sliding friction of magnitude less than 20 N is acting on the wooden block.

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