Physics chapter 9

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  • P9: Motion
    • P9.1:Speed and Distance-time graphs
      • Speed= distance travelled/ time taken
        • speed is measured in m/s
      • The gradient of a line on a distance-time graph represents speed
        • Speed= distance travelled/ time taken
          • speed is measured in m/s
    • P9.2 velocity and acceleration
      • velocity is a speed in a given direction
      • the acceleration of an object is its change of velocity per second
        • deceleration is the change of an objects velocity when it slows
        • acceleration= change in velocity/time taken for change
      • a vector is a physical quantity that has direction AND magnitude
        • a scalar is a physical quantity that only has magnitude
      • displacement is distance travelled in a given direction
    • P9.4: analysing motion graphs
      • gradient =y/x
      • find the speed at any point by drawing a tangent
        • the tangent is a straight line that touches the curve without cutting through
          • the speed at any instant in time of an object moving at changing speed is given by the gradient of the tangent to the line
      • the speed at any instant in time of an object moving at changing speed is given by the gradient of the tangent to the line

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