Question

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the harder one object is pushed against the other, the the force of friction that results.
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Explanation:

Friction force \( F_f=\mu F_N \), where \( \mu \) is the coefficient of friction (constant for two given surfaces) and \( F_N \) is the normal force. When one object is pushed harder against another, the normal force \( F_N \) increases. Since \( F_f \) is directly proportional to \( F_N \) (because \( \mu \) is constant), as \( F_N \) increases, \( F_f \) also increases.

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