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Inertia, forces, and motion.

According to Newton's 1st Law of Motion (aka "inertia") bodies tend to keep doing whatever they are already doing!

Thus - as long as forces on it are balanced -
-----a body at rest will remain at rest, and
-----a moving body keeps moving a straight line a constant speed.

However, a NET force will cause a CHANGE in velocity, affecting speed and/or direction of the body.

Such a change in velocity is called acceleration.

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