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The graph is a hoirzontal line. Velocity is zero.

The graph is a hoirzontal line. Velocity is zero. The slope > 0 (positive). The object is moving towards the end position. The slope <0 (negative). The object is moving towards the start position. Speed or velocity is at middle instant of the time interval.

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The graph is a hoirzontal line. Velocity is zero.

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  1. The graph is a hoirzontal line. Velocity is zero.

  2. The slope > 0 (positive). The object is moving towards the end position

  3. The slope <0 (negative). The object is moving towards the start position

  4. Speed or velocity is at middle instant of the time interval.

  5. Constructing Speed time graph or velocity time graph

  6. Construct from a distance-time graph (or a displacement-time graph)

  7. Displacement and v-t graph • The following slides show you the relationship between displacement (S) and the v-t graph (velocity-time graph)

  8. area under the graph? Graph area under the graph from t = 0.1s to 0.2s is the distance travelled during t=0.1s to 0.2s Area = 0.6 x (0.2- 0.1) Area = speed x time = distance

  9. Displacement travelled by the object from time t1 to t2 = area A V1

  10. V/ms-1 v2 v1 t/s t1 t2 The area under v-t graph Displacement due to the increase of velocity from v1 to v2 from t1 to t2 Displacement due to v1 from t1 to t2

  11. c is the y-intercept, c = 0. Slope m= a. The equation is v = a t y = mx

  12. ‘at’ or ‘v’ S = area t

  13. y m x c

  14. at v S=(u+v)t/2 1/2 (a t2) ut u u t t

  15. nos nov noa not

  16. u , v , a & s can be ‘+’ or ‘-’ depend on direction

  17. ‘+’direction Case 1 t = 3s u = 1ms-1 v = 4ms-1 a = ? Case 2 t = 5s u = 1ms-1 v = - 4ms-1

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