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# Summary7 - Summary Lecture 7 Netwons 2nd Law The...

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Netwon’s 2nd Law: Summary Lecture 7 The acceleration of a body is directly proportional to the net force acting on it, and inversely proportional to its mass. F net = ma The direction of the acceleration is in the direction of the applied net force the direction of the applied . Force: Force is a vector Force is a vector. Forces are measured in units of Newton (N). 1 N is the force required to accelerate a mass of 1 kg with 1 m/s 2 . 1 N = 1 kg m/s 2

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Inertial Reference Frames Â Newton’s 1st law holds Newton s 1st law holds Â moving with constant velocity not rotating and not accelerating Weight Force of gravity acting on a mass F = mg, down Newton’s Third Law of Motion: Whenever one object exerts a force on a second object, the second exerts an equal and opposite force on the first. N t th ti d th ti f Note: the action and the reaction force are excerted on different objects