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8. When attempting to determine the coefficient of kinetic friction, why is it necessary to move...

8. When attempting to determine the coefficient of kinetic friction, why is it necessary to move the block with constant velocity? When attempting to determine the coefficient of static friction, why is it necessary to measure the applied force just before the block moves? Are these two scenarios (constant velocity and almost in motion) the only scenarios when friction is present? Explain your answer.

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