Physics: Explaining Motions

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  • P4: Explaining Motions
    • Speed:
      • Speed (m/s) = Distance (m) /Time (s)
      • Instantaneous Speed: is a particular speed in one moment in time.
      • Speed-Time Graphs:
        • A visual way of showing how an objects speed changes over a period of time.
        • The steeper  line, the greater the size of the  accelaration.
          • A horizontal line means that the speed of the object is at a constant speed.
          • A straight line going up shows accelaration.
          • A straight line going down shows decelaration.
    • Velocity:
      • The speed of an object in a certain direction.
    • Gradient:
      • The degree of slope of  a line.
      • The gradient of a speed time graph is accelaration.
    • Distance-Time Graphs
      • A visual way of showing the time taken for a journey, and the distance travelled.
      • The steeper the gradient of the line, the faster the speed.
        • A horizontal line suggests that the vehicle is stationary.
        • A straighter diagonal line means that the vehicle is travelling at a constant speed.
      • The gradient of the line is equal to the speed.
  • How far an object travels, using the equation:
  • Accelaration = Changeof velocity (metres per second)/ time for the change


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