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Effect of Normal Force on Friction

A box of mass...

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A box of mass 8 kg is placed on a rough inclined plane of inclination theta. Its downward motion can be prevented by applying an upward pull F and it can be mad to slide upwards by applying a force of 2F. Find the coefficient of friction between the box and inclined plane.

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Q. A box of mass

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and it can be made to slide upwards by applying a force

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