1. Ch.5 Motion Graph (運動圖表)

2. 4.2 Velocity-time Graph (速度-時間綫圖)
time t
velocity v
The velocity-time graph (v-t graph) of uniform motion (constant velocity) is a horizontal line. 2

3. v1 = velocity of object A v2 = velocity of object B v1 > v2
velocity v
time t A B v1 v2
v1 = velocity of object A
v2 = velocity of object B
v1 > v2 3

4. Displacement = Area of v-t graph
velocity v
time t v t
Displacement = Area of v-t graph 4

5. 5.1 Velocity-time Graph (速度-時間綫圖)

7. 5.1 7

8. velocity = 6 m s-1 8

9. What is the displacement of the man at t = 40 s?9

10. displacement = area = (6)(40) = 240 m
What is the displacement of the man at t = 40 s?
displacement = area = (6)(40) = 240 m 10

11. 5.2

12. 5.2 D

13. 5.3

14. 5.3 D

15. 5.4

16. a = slope = 8 ÷ 40 = 0.2 m s-2

18. s = area = 0.5 × 8 × 40 = 160 m

21. 5.5

22. (i) a = slope = 0
(ii) a = slope = (0-18) ÷ (20-10) = -1.8 ms-2

24. (i) s = area = (10)(18)
= 180 m

25. (ii) s = area = 0.5 × 10 × 18
= 90 m