Suppose you use an ideal pulley of the type shown in Figure 5.18(c) to support a car engine of mass 115 kg. (a) What would the tension in the rope be? N (b) What force must the ceiling supply, assuming you pull straight up on the rope? The pulley system's mass is 6.00 kg. N (upward)

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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.