What is FN in physics?
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FN is the normal force. As is indicated by the equation, it is actually the normal force, not the weight, that is responsible for friction. Classification of Friction Forces
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The normal force is the force that surfaces exert to prevent solid objects from passing through each other. Normal force is a contact force. ... For example, the surfaces of a table and a box cannot exert normal forces on each other if they are not in contact.
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