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

2. 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.

3. 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.

4. Speed and Velocity

5. 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.

6. Distance-Time Graph TIME

7. Example of Stationary Speed

8. Velocity-Time Graph Time in s constant velocity

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

10. 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.

11. Force-Time Graph