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  • Momentum
    • Law of conservation of momentum
      • Total momentum before interaction = total momentum after
      • Doesn't apply when external forces like friction are applied.
        • So works when in a closed system
    • Mass X Velocity
    • kg m/s = unit
      • or NS = Newton seconds
    • Has size and direction
      • Use a computer and a motion sensor to investigate a collision between 2 trolleys.
        • Trolley A is given a push so it collides with trolley B. The 2 trolleys stick together after the collision.
          • The computer gives the velocity of A before the collision and the velocity of both trolleys afterwards.
            • Measure the mass of the trolleys


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