OCR Physics A - Newtonian world word definitions 2.0 / 5 PhysicsForcesA2/A-levelOCR Created by: Ryan DunsmuirCreated on: 10-01-13 11:05 Newton's First Law A body will remain at rest or continue to move with constant velocity unless acted on by an external force 1 of 6 Newton's Second Law Force is proportional to the rate of change of momentum 2 of 6 Newton's Third Law When one body exerts a force on another the other body exerts a force that is equal in magnitude and opposite in direction on the first body 3 of 6 Newton The force which gives a mass of 1 kg an acceleration of 1 ms^-2 4 of 6 Linear momentum The product of mass and velocity ; momentum is a vector 5 of 6 net force on a body proportional to the rate of change of momentum 6 of 6

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