Changing speed

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  • Speed-time graphs
      • Acceleration
        • acceleration=change in speed/timetaken
        • negative acceleration [m/s2]  = deceleration
      • Relative velocities
        • velocity is a vector, both speed and direction
        • two cars in opposite directions, relative velocity is the sum of individual velocities
        • difference of individual velocities if going in same direction
      • Circular motion
        • A vehicle may go around a roundabout but is accelerating, direction of travel is changing
    • speed per unit time is acceleration. Speed increase=deceleration, speed decrease=deceleration


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