Newton's Laws of Motion

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  • Newton's laws of Motion
    • First Law
      • An object will remain at rest or continue to move with a constant velocity unless acted upon by a resultant force
      • If an objects velocity changes, a resultant force must be acting on the object
      • Velocity is a vector quantity
        • A change in velocity means a change in speed
        • A change in velocity means a change in direction
    • Second Law
      • The net force acting on an object is directly proportional to the rate of change of its momentum, and is in the same direction
      • Force = change in momentum / time
      • F=ma (special case)
        • Force = change in momentum / time
        • change in momentum = mv - mu
        • mv-mu/t = m(v-u/t)
        • v-u/t = acceleration (a)
        • Therefore F=ma
    • Third Law
      • When 2 objects interact, they exert equal and opposite forces on eachother
      • The forces acting are always the same type of force
      • You never see both forces acting on the same object

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