The figure depicts a hockey puck sliding with a constant speed v0 in a straight line from point "a" to point "b" on a frictionless horizontal surface. Forces exerted by the air are negligible. You are looking down on the puck. When the puck reaches point "b," it receives a swift horizontal kick in the direction of the heavy print arrow. Had the puck been at rest at point "b," then the kick would have set the puck in horizontal motion with a speed vk in the direction of the kick. Along the frictionless path you have chosen in question 8, the main force(s) acting on the puck after receiving the kick is (are): a downward force of gravity. a downward force of gravity and a horizontal force in the direction of motion. a downward force of gravity, an upward force exerted by the surface, and a horizontal force in the direction of motion. a downward force of gravity and an upward force exerted by the surface. (No forces act on the puck.)

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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.