SPEED & VELOCITY

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SPEED & VELOCITY

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SPEED & VELOCITY

  1. 1. 3 SIMULATIONS : http://hypertextbook.com /physics/mechanics/displacement/ (distance & displacement) http://regentsprep.org/Regents/physics/phys (distance & displacement – ant)
  2. 2. 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
  3. 3. 5 DIFFERENCES BETWEEN DISTANCE & DISPLACEMENT B A
  4. 4. 6 B distance displacement A
  5. 5. 7 DISTANCE AND DISPLACEMENT  Total length travelled from point A to point B  Total distance travelled in a specified direction A B
  6. 6. 8 DISTANCE  The total path length travelled from one location to another  Scalar quantity  SI unit : m
  7. 7. 9 DISPLACEMENT  The distance between two location measured along the shortest path connecting them in a specified direction  Vector quantity  SI unit : m
  8. 8. 10 SPEED & vELoCITy
  9. 9. 11 SPEED  The rate of change of distance Average speed = total distance travelled, s time, t  Scalar quantity  SI unit : ms-1
  10. 10. 12  The rate of change of displacement Average velocity = total displacement , s time, t  Vector quantity  SI unit : ms-1 vELoCITy
  11. 11. 13 ISTANTANEoUS SPEED :  The speed at any instant ISTANTANEoUS vELoCITy :  The velocity at any instant
  12. 12. 14 http://www.glenbrook.k12.il.us/gbssci/phys/m (average speed)
  13. 13. 15 APPLICATIoN :
  14. 14. 16 QUESTIoN 1 : A cow moves 3 m to the East and the 4 m to the North. Find the : (a) Total distance moved by the cow (b) Displacement of the cow
  15. 15. 17 North East West East North South South East North West South West DIRECTION
  16. 16. 18 ANSWER 1 : A B C 3 m 4 m (a)The total distance moved by the cow = 3 m + 4 m = 7 m (b) Displacement of the cow = √32 + 42 = 5 m due to North East
  17. 17. 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 : (a) The total distance travelled (b) The displacement from O (c) The average speed of the cyclist (d) The average velocity of the cyclist 150 m 200 m
  18. 18. 20 O A B 150 m 200 m ANSWERS 2 :
  19. 19. 21 (a) Total distance travelled = 150 m + 200 m = 350 m (b) Displacement = √1502 + 2002 = 250 m due North East
  20. 20. 22 (c) Average speed = 350 m 25 s = 14 ms-1 (d) Average velocity = 250 m 25 s = 10 ms-1
  21. 21. 23 REFLECTION / CLOSURE (EVALUATION)
  22. 22. 24 DIFFERENCES BETWEEN DISTANCE & DISPLACEMENT : DISTANCE DISPLACEMENT The total path length travelled from one location to another The distance between two location measured along the shortest path connecting them in a specified direction Scalar quantity Vector quantity SI unit : metre SI unit : metre
  23. 23. 25 DIFFERENCES BETWEEN SpEED & vEloCITy : SPEED VELOCITY The rate of change of distance The rate of change of displacement Scalar quantity Vector quantity Average speed = total distance travelled, s time, t Average velocity = total displacement , s time, t SI unit : ms-1 SI unit :ms-1

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