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Acceleration |
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The Space Shuttle accelerates off the launch pad at 50m/s/s. Every second the Shuttle increases its speed by 50m/s. From a standing start it increases its speed from zero to 50m/s in the first second of flight. Two seconds into its flight and its speed is now 100m/s. The rate at which the speed
of an object changes is called |
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The
slope of the speed-time graph represents the magnitude of the acceleration.
The greater the slope the greater the acceleration. |
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Deceleration (negative acceleration) is represented by a graph with a negative slope. | ||

Zero acceleration is represented by a straight line on the speed-time graph. This indicates a constant speed and so no acceleration is present. | ||

Look at the speed-time graph on the left. Notice that the object accelerates between 0 and 5 seconds. The acceleration can be calculated by calculating the slope of the graph. Slope = acceleration = Rise/run = 10ms/5s = 2m/s/s. So the speed is increasing by 2m/s every second. Between 5 and 10 seconds the speed is constant and therefore the acceleration is zero. The object once again accelerates
between 10 and 13 seconds. the acceleration is calculated. Between 13 and 16 seconds the
object is accelerating but at a lesser rate. |
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