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Uniform motion in a straight line: An object in the situation has a constant velocity.

An object at rest has a constant velocity of zero. Basically what this means is that if these objects are left alone, they will continue to move at the same speed and direction as they are right now (or lack of).

External force: This is any force from outside the object. For instance, a moving car will stop if it hits another moving car, but not if you step on the floorboard because stepping on the floorboard is an internal force.

Unbalanced forces: These are forces that are not equal and cause motion. If the forces were balanced, there would be no motion.

At rest: The object is not moving at all (or seemingly).

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14y ago

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