Newton's laws of motion

Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Newton's laws of motion. Man pushing a lawnmower to demonstrate Newton's three laws of motion. The first law states that an object will either remain at rest or move at a continous speed, unless acted upon by a force. The second law states that the force of an object is equal to its mass times its acceleration. The third law states that when one object places a force on a second object, the second object places a force of equal strength in the opposite direction on the first.

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