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Time Graphs 4.3.2 Analyze velocity-time, distance-time, and force-time graphs of sporting activities.

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Speed and Velocity Speed involves distance & time Average speed – can be calculated by dividing total distance by total time. S= D/T Instantaneous speed – an object’s speed at a specific moment When instantaneous speed does not change, an object is moving at constant speed ; in this situation average speed and instantaneous speed are the same. Speed can be represented on graphs.

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Velocity-Time Graphs The steeper the line, the greater the acceleration or deceleration. A sloping line tells us there is a change in velocity and the object is either accelerating or decelerating. A horizontal line tells us there is no change in Velocity. Deceleration is when the line returns to zero. Returning to zero in a Velocity-Time graph tells us we’ve just stopped moving.

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Speed and Velocity

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Distance-Time Graphs If the line of a graph is sloping but straight then the object is moving at a steady speed. The slope of a graph tells us a great deal. If the line is horizontal then no distance is travelled so the object must be stationary. Once the line returns to zero it tells us we are back at the starting point.

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Distance-Time Graph TIME

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Example of Stationary Speed

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Velocity-Time Graph Time in s constant velocity

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Velocity-Time Graph (w/Displacement) Time (s)

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Force-Time Graph A Force-Time graph shows the variation of force with respect to time. More usefully the area under such a graph is the impulse.

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Force-Time Graph

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