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1) "An object will not change its motion unless acted on by an unbalanced force."
A body remains at rest, or in motion at a constant speed in a straight line, except insofar as it is acted upon by a force.
2) "Force equals mass multiplied by acceleration."
The net force on a body is equal to the body's acceleration multiplied by its mass or, equivalently, the rate at which the body's momentum changes with time.
3) "Every action has an equal and opposite reaction"
If two bodies exert forces on each other, these forces have the same magnitude but opposite directions.