At a family picnic you are appointed to push your obnoxious cousin Throckmorton in a swing . His weight is w, the length of the chains is R, and you push Throcky until the chains make an angle u0 with the vertical. To do this, you exert a varying horizontal force F S that starts at zero and gradually increases just enough that Throcky and the swing move very slowly and remain very nearly in equilibrium throughout the process. (a) What is the total work done on Throcky by all forces? (b) What is the work done by the tension T in the chains? (c) What is the work you do by exerting force F ? (Ignore the weight of the chains and seat.)

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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.