Newtons Second Law Unit 1 Mod.1 A2 OCR

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  • Newtons Second Law
    • Definition
      • Rate of change of momentum is directly proportional to NET force
    • F ? ?p/?t
    • IMPORTANT: use the correct 'directly proportional' symbol in place of "?" it was the closest i could find on computer
    • F ? ?p/?t ? ma
      • Proof
        • F ? ?p/?t
          • ?p = m?v
            • so, F ? m?v/?t
              • a = ?v/?t
                • So, F ? ma
            • Remember from Newtons 1st Law?
    • Mass
      • The inertia of an object
        • (how difficult it is to accelerate an object)
      • Remains constant
    • Weight
      • Gravitational force the Earth exerts on an object
        • g = acceleration due to gravity from Earth
      • W = mg
        • g = acceleration due to gravity from Earth
        • F = ma
          • Hence Weight is a Force and is measured in Newtons
      • Varies slightly around Earth and certainly around the Universe!

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