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Friction

Newton's Laws

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Newton?s Laws Sir Isaac Newton Newton?s First Law Gravity Force This picture demonstrates Newton?s first law as it shows an object at rest. The reason it is at rest however, is because there are balanced forces at work. The gravity is pulling the rocket down, but that force is counter-acted by the equal force created by the base, and therefore the ground on which the rocket sits. Obviously, there are other forces at work stopping the rocket from tipping over when pushed by things such as wind, such as the red tower.

Physics Old Free Response

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SHS AP QUIZ 8 KEY 1976 B1 The two guide rails for the elevator shown above each exert a constant friction force of 100 newtons on the elevator car when the elevator car is moving upward with an acceleration of 2 meters per second squared. The pulley has negligible friction and mass. Assume g = 10 m/sec2. (a) On the diagram below, draw and label all forces acting on the elevator car. Identify the source of each force. (b) Calculate the tension in the cable lifting the 400-kilogram elevator car during an upward acceleration of 2 m/sec2. (Assume g 10 m/sec2.) (c) Calculate the mass M the counterweight must have to raise the elevator car with an acceleration of 2 m/sec2.
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