# Newton1 - Newton's Second Law Newton's Second Law gives us...

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Newton's Second Law Newton's Second Law gives us a quantitative relation between force and motion: secondlaw F = ma Stated verbally, Newton's Second Law says that the net force (F) acting upon an object causes acceleration (a), with the magnitude of the acceleration directly proportional to the net force and inversely proportional to the mass (m). Learn it and love it. Like it or not, this equation will be used at almost all times in virtually every physics course you take. The Second Law relates two vector quantities, force and acceleration. Because both force and acceleration are vector quantities, it is important to understand that the acceleration of an object will always be in the same direction as the sum of forces applied to the object. The magnitude of acceleration depends on the mass of the object, but is always proportional to the force. Newton's Second Law gives an exact relation between the vectors force and motion. Thus we can use this law to predict the motion of an object given forces acting upon it, on a quantitative level.
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