Why limiting friction is directly proportional to normal reaction?
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Prove that limiting friction is directly proportional to normal reaction. ... It has a limiting value called limiting friction, which is equal to the least force required to move the body from rest. When the external force F is increased, a stage comes when the body is just at the verge of moving
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Hence frictional force is directly proportional to the normal force between the two surfaces in contact. Because when two surfaces are pressed together harder, there is more friction. The normal force measures how much force is pressing the surfaces together.
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