9. When the two surfaces are pressed harder, friction increases. Explain why?
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Explanation:
When the two objects are pressed harder towards each other this is called as interlocking. This occurs due to irregularities between the two surfaces which slide over each other. The force of friction will increase when the two objects are pressed harder.
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The friction is caused by the interlocking of irregularities in the two surfaces. It is obvious that the force of friction will increase if two surfaces are pressed harder. This can be experienced by dragging a mat when nobody is sitting on it and when a person is sitting on it.
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