how can i know the magnitude of friction
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As long as the applied force has amagnitude smaller than msN, the force of static friction fs has the samemagnitude as the applied force, but points in the opposite direction. Themagnitude of the force of kineticfriction acting on an object is fk = mkN, where mk is the coefficient of kineticfriction.
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frition force is equal to miu×normal is the right answer
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