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Question

Consider the following statements:

Statement 1: Friction is caused due to interlocking of irregularities present on the surfaces in contact.
Statement 2: Frictional force increases if the two surfaces are pressed harder.

Which of these statement is correct?

A
Only statement 1 is correct.
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B
Only statement 2 is correct.
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C
Both the statements are correct.
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D
Neither of the statements is correct.
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Solution

The correct option is C Both the statements are correct.
Friction is caused by the interlocking of irregularities present on the surfaces in contact. Rough surfaces have a large number of irregularities and generally have more friction.
This frictional force increases if the two surfaces are pressed harder. For example, one can easily drag a mat when nobody is sitting on it. However, dragging the same mat becomes quite difficult when a person is sitting on it. Thus, both the statements are correct.

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