17 An object of mass m is lifted a vertical distance h above the surface of Earth at constant speed v in time t. The total gravitational potential energy with respect to Earth's surface gained by the object is equal to the (1) average force applied to the object (2) total weight of the object (3) total work done on the object (4) total momentum gained by the object 18 A box weighing 1.0 × 10² newtons is dragged to the top of an incline, as shown in the diagram below. 10.0 m 6.0 m Force 1.0 x 102 N 8.0 m With respect to the bottom of the incline, the gravitational potential energy of the box at the top of the incline is (1) 1.0 x 10 J (2) 6.0 x 10 J (3) 8.0 x 10 J (4) 1.0 x 10 J 19 What is the spring constant of a spring of negligible mass that gains 6.0 joules of elastic potential energy as a result of being compressed 0.40 meter? (1) 2.4 N/m (2) 15 N/m (3) 38 N/m (4) 75 N/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.