A person stands on a scale inside an elevator at rest (see the figure below). The scale reads W = 895 N. W (a) What is the person's mass? kg a (b) The elevator accelerates upward momentarily at the rate of a = 4 m/s2. What does the scale read then? N (c) The elevator then moves with a steady speed of 7 m/s. What does the scale read now? N

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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.