- In the absence of external forces, an object at rest remains at rest and an object in motion continues in motion with a constant velocity (that is, with a constant speed in a straight line).
- The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
- If two objects interact, the force exerted by object 1 on object 2 is equal in magnitude to and opposite in direction to the force exerted by object 2 on object 1.
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