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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