(numbers 16-17) A 2.00 kg block begins at rest on a horizontal surface. When a horizontal 3.00 N force is applied, the block doesn't move. When the force is increased to 5.00 N, the block accelerates at 1.00 m/s². A 3.00 kg block is now attached to the top of the 2.00 kg block. 16. The blocks begin at rest. When a horizontal 7.5 N force is applied, the surface exerts a friction force of N on the block. a) kinetic, 5.0 b) kinetic, 7.5 c) static, 7.5 d) static, 5.0 e) more information is needed to determine the friction force 17. The blocks begin at rest. When a horizontal 15.0 N force is applied, the surface exerts a friction force of N on the block. a) static, 15.0 b) static, 7.5 kinetic, 7.5 d) kinetic, 15.0 more information is needed to determine the friction force

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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.