Newton's Second Law of Motion

The acceleration of an object is in the direction of and directly proportional to the net force applied, and inversely proportional to the object's mass
Valid only in inertial reference frames.
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Mass vs. Weight

Mass is the amount of "stuff" something is made up of.
It remains constant
Weight (mg) is the force of gravity on an object
- Weight varies with gravitational field strength (g)

Newton's Third Law of Motion

All forces come in pairs. If Object 1 exerts a force on Object 2, then the Object 2 must exert a force back on Object 1, which is equal in magnitude and opposite in direction
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