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Getting faster? (accelerating)

Getting faster? (accelerating). distance. time. Getting faster (accelerating). distance. time. Examples. distance. time. A car accelerating from stop and then hitting a wall. distance. time. Speed against time graphs. speed. time. Speed against time graphs. speed. time.

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Getting faster? (accelerating)

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  1. Getting faster? (accelerating) distance time

  2. Getting faster (accelerating) distance time

  3. Examples distance time

  4. A car accelerating from stop and then hitting a wall distance time

  5. Speed against time graphs speed time

  6. Speed against time graphs speed time

  7. No movement? speed time

  8. No movement speed time

  9. Constant speed? speed time

  10. Constant speed speed time

  11. Constant speed How would the graph look different for a faster constant speed? speed time

  12. Constant speed speed fast time

  13. Constant speed How would the graph look different for a slower constant speed? speed fast time

  14. Constant speed speed fast slow time

  15. Getting faster? (accelerating) speed time

  16. Getting faster? (accelerating) speed Constant acceleration time

  17. Getting faster? (accelerating) speed The gradient of this graph gives the acceleration time

  18. Getting faster? (accelerating) v The gradient of this graph gives the acceleration speed a = v – u t (v= final speed, u = initial speed) u time

  19. Getting faster? (accelerating) speed The area under the graph gives the distance travelled time

  20. Example: speed time

  21. A dog falling from a tall building (no air resistance) speed time

  22. A dog falling from a tall building (no air resistance) speed time

  23. A dog falling from a tall building (no air resistance) speed Area = height of building time

  24. distance speed time time Be careful!

  25. distance speed time time No movement

  26. distance speed time time Constant speed gradient = speed Area under graph = distance travelled

  27. distance speed time time Constant acceleration Gradient = acceleration = a = (v-u)/t Area under graph = distance travelled

  28. Distance time graphs ;Summary • The gradient of a distance time graph gives the velocity • increasing gradient means object is accelerating • decreasing gradient means object is decelerating • zero gradient means object is stationary

  29. Velocity time graphs; Summary • The gradient of a velocity time graph gives the acceleration of an object • the area under a velocity time graph gives the total distance traveled • Increasing or decreasing gradient gives the rate at which the acceleration is increasing or decreasing • Zero gradient means the object is travelling at constant speed

  30. Problems 5, 0, 3.75m 1. Calculate the speed over OA AB and BC 2. Calculate (a)the acceleration over OA, AB and BC (b) the total distance traveled in the 12 s 5m/s2, 0, 3.75m/s2, 127.5m

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