Netwon’s 2nd Law:Summary Lecture 7 The acceleration of a body is directlyproportional to the net force acting onit, and inversely proportional to itsmass.Fnet= maThe direction of the acceleration is inthe direction of the appliednet forcethe direction of the applied .Force:Force is a vectorForce is a vector.Forces are measured in units ofNewton (N). 1 N is the force requiredto accelerate a mass of 1 kg with1 m/s2 . 1 N = 1 kg m/s2
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Inertial Reference FramesÂNewton’s 1st law holdsNewton s 1st law holdsÂmoving with constant velocity≠not rotating and not acceleratingWeightForce of gravity acting on a massF = 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 onthe first.N tthtid thtifNote:the action and the reaction force are excerted on differentobjects