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A force is a push or pull, and the units for force are [Newtons = N]. (Some countries continue to use an archaic unit called the "pound".) A Newton is approximately the amount of force that you would exert on an apple near the Earth's surface to keep it from falling.

Examples of forces include the force of a horse pulling a cart, the force of a spring pushing the chassis of a car, the force of gravity pulling you down, and the force on your head due to pressure when you are at the bottom of a pool.

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