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Question about Friction force
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[QUOTE="jack action, post: 4915477, member: 240508"] Friction is a reactive force, so you need another force to create the friction. In your case, the force is the weight of the book so the friction force will never be greater than the weight of the book. What the [I]coefficient of friction times the normal force[/I] equation tells you is the MAXIMUM force that friction can handle. So by pushing harder you do not increase friction, but if you would add another force pushing the book down (say adding weight on it), the friction force could still resists the increased downward force. [/QUOTE]
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Question about Friction force
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