A pile driver is a device with a heavy hammer weight that is lifted and then dropped onto a pile (such as a telephone pole) to drive it into the ground.  Suppose our particular pile driver is driving in telephone poles along a new roadway to carry services to a new neighborhood.  The weight of the hammer is 12,000 Newtons and it is released from rest a distance of 8 meters above the top of the telephone pole.  If the pole resists the driving with a force of 150,000 Newtons of force, then how far into the ground does each blow with the pile driver drive in the telephone pole? a) 0.64 m b) 1.29 m C) 0.31 m d) 0.078 m e) 0.98 m

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Q: A 5 kg box rests on a tabletop. On one side, it compresses a spring with a stiffness of 1000 N/m by…

A: mass of box (m) = 5 kg spring constant (k) = 1000 N/m compression (d) = 1 cm = 0.01 cm

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A: A sedan moves relative to the road = 20mph sports driving relative to the road     =50 mph We have…

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A: Given : F =(6i-2j) N d =(2i+3j) m

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.