The document discusses the differences between distance and displacement, as well as speed and velocity. It defines each term, provides examples, and shows calculations of total distance, displacement, average speed and average velocity for sample problems. Distance is the total length travelled, regardless of direction, while displacement considers direction from start to finish. Speed is the rate of change of distance over time, while velocity is the rate of change of displacement over time, making it a vector quantity.

1. INDUCTION SET : http:// video.search.yahoo.com/video/play?vid =106837&vw= g&b =0&pos=14&p= racing+car&fr =yfp-t-501

2. INDUCTION SET

3. SIMULATIONS : http:// hypertextbook.com /physics/mechanics/displacement/ (distance & displacement) http://regentsprep.org/Regents/physics/phys01/velocity/default.htm (distance & displacement – ant)

4. A car is moving towards North A snake is crawling Speed limit on the highway in Malaysia is 110 kmh -1 An athlete is moving towards the checkpoint at a velocity of 25 ms -1

5. DIFFERENCES BETWEEN DISTANCE & DISPLACEMENT B A

6. B distance displacement A

7. DISTANCE and DISPLACEMENT Total length travelled from point A to point B Total distance travelled in a specified direction A B

8. DISTANCE The total path length travelled from one location to another Scalar quantity SI unit : m

9. DISPLACEMENT The distance between two location measured along the shortest path connecting them in a specified direction Vector quantity SI unit : m

10. Speed & velocity

11. SPEED The rate of change of distance Average speed = total distance travelled, s time, t Scalar quantity SI unit : ms -1

12. The rate of change of displacement Average velocity = total displacement , s time, t Vector quantity SI unit : ms -1 velocity

13. ISTANTANEOUS SPEED : The speed at any instant ISTANTANEOUS velocity : The velocity at any instant

14. http://www.glenbrook.k12.il.us/gbssci/phys/mmedia/kinema/trip.html (average speed)

15. APPLICATION :

16. QUESTION 1 : A cow moves 3 m to the East and the 4 m to the North. Find the : Total distance moved by the cow Displacement of the cow

17. North East West East North South South East North West South West DIRECTION

18. ANSWER 1 : A B C 3 m 4 m The total distance moved by the cow = 3 m + 4 m = 7 m (b) Displacement of the cow = √3 2 + 4 2 = 5 m due to North East

19. QUESTION 2 : O A B Figure shows the path travelled by a cyclist. He started his journey from O, moved a distance of 150 m to East towards A and then moved a distance of 200 m to North towards B. The cyclist took about 25 s to complete his journey. Determine : The total distance travelled The displacement from O The average speed of the cyclist The average velocity of the cyclist 150 m 200 m

20. ANSWERS 2 : O A B 150 m 200 m

21. Total distance travelled = 150 m + 200 m = 350 m (b) Displacement = √150 2 + 200 2 = 250 m due North East

22. (c) Average speed = 350 m 25 s = 14 ms -1 (d) Average velocity = 250 m 25 s = 10 ms -1

23. REFLECTION / CLOSURE (EVALUATION)

24. DIFFERENCES BETWEEN DISTANCE & DISPLACEMENT : Vector quantity Scalar quantity SI unit : metre SI unit : metre The distance between two location measured along the shortest path connecting them in a specified direction The total path length travelled from one location to another DISPLACEMENT DISTANCE

25. DIFFERENCES BETWEEN speed & velocity : Average velocity = total displacement , s time, t Average speed = total distance travelled, s time, t Vector quantity Scalar quantity SI unit :ms -1 SI unit : ms -1 The rate of change of displacement The rate of change of distance VELOCITY SPEED

26. DISPLACEMENT

27. distance

28. SPEED

29. VELOCITY