a 1.34 kg ball is connected by means of two massless strings, each of length L 1.70 m, to a vertical, rotating rod.The strings are tied to the rod with separation d = 1.70 m and are taut.The tension in the upper string is 35 N.What are the (a) tension in the lower string, (b) magnitude of the net force on the ball, and (c) speed of the ball? (d) What is the direction of F ?

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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.