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# Horizontal force required to set a block in motion: static and kinetic friction

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A 25kg block is initially at rest on a rough, horizontal surface. A horizontal force of 75N is required to set the block in motion. After it is in motion, a horizontal force of 60N is required to keep it in motion.

A. Calculate the coefficient of static friction
B. Calculate the coefficent of kinetic friction
C. If the original force of 75 N is continued after the block is set in motion, what will be the velocity of the block in 5 sec.?

https://brainmass.com/physics/newtons-second-law/horizontal-force-required-set-block-motion-static-kinetic-friction-11082

#### Solution Preview

Use the first and second law of motions, please see attached.

(A)

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With graphics and good explanations, the problem is solved.

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