Newton's Second Law of Motion
Newton's Second Law is more abstract than the First. The Second Law governs all acceleration and is really very simple -- acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
Everyone unconsiously knows the Second Law. Everyone knows that heavier objects require more force to move the same distance than do lighter objects. The Second Law, however, gives us an exact relationship between force, mass, and acceleration.
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