Macro.slides

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Macro.slides

  1. 1. INDUCTION SET : <ul><li>http:// video.search.yahoo.com/video/play?vid =106837&vw= g&b =0&pos=14&p= racing+car&fr =yfp-t-501 </li></ul>
  2. 2. INDUCTION SET
  3. 3. SIMULATIONS : <ul><li>http:// hypertextbook.com /physics/mechanics/displacement/ </li></ul><ul><li>(distance & displacement) </li></ul><ul><li>http://regentsprep.org/Regents/physics/phys01/velocity/default.htm </li></ul><ul><li>(distance & displacement – ant) </li></ul>
  4. 4. <ul><li>A car is moving towards North </li></ul><ul><li>A snake is crawling </li></ul><ul><li>Speed limit on the </li></ul><ul><li>highway in Malaysia </li></ul><ul><li>is 110 kmh -1 </li></ul><ul><li>An athlete is moving </li></ul><ul><li>towards the checkpoint </li></ul><ul><li>at a velocity of 25 ms -1 </li></ul>
  5. 5. DIFFERENCES BETWEEN DISTANCE & DISPLACEMENT B A
  6. 6. B distance displacement A
  7. 7. DISTANCE and DISPLACEMENT <ul><li>Total length travelled from point A to point B </li></ul><ul><li>Total distance travelled in a specified direction </li></ul>A B
  8. 8. DISTANCE <ul><li>The total path length travelled from </li></ul><ul><li> one location to another </li></ul><ul><li>Scalar quantity </li></ul><ul><li>SI unit : m </li></ul>
  9. 9. DISPLACEMENT <ul><li>The distance between two location </li></ul><ul><li>measured along the shortest path </li></ul><ul><li>connecting them in a specified </li></ul><ul><li>direction </li></ul><ul><li>Vector quantity </li></ul><ul><li>SI unit : m </li></ul>
  10. 10. Speed & velocity
  11. 11. SPEED <ul><li>The rate of change of distance </li></ul><ul><li>Average speed = total distance travelled, s </li></ul><ul><li> time, t </li></ul><ul><li>Scalar quantity </li></ul><ul><li>SI unit : ms -1 </li></ul>
  12. 12. <ul><li>The rate of change of displacement </li></ul><ul><li>Average velocity = total displacement , s </li></ul><ul><li> time, t </li></ul><ul><li>Vector quantity </li></ul><ul><li>SI unit : ms -1 </li></ul>velocity
  13. 13. ISTANTANEOUS SPEED : <ul><li>The speed at any instant </li></ul>ISTANTANEOUS velocity : <ul><li>The velocity at any instant </li></ul>
  14. 14. <ul><li>http://www.glenbrook.k12.il.us/gbssci/phys/mmedia/kinema/trip.html </li></ul><ul><li>(average speed) </li></ul>
  15. 15. APPLICATION :
  16. 16. QUESTION 1 : <ul><li>A cow moves 3 m to the East and the </li></ul><ul><li>4 m to the North. Find the : </li></ul><ul><ul><ul><li>Total distance moved by the cow </li></ul></ul></ul><ul><ul><ul><li>Displacement of the cow </li></ul></ul></ul>
  17. 17. North East West East North South South East North West South West DIRECTION
  18. 18. ANSWER 1 : A B C 3 m 4 m <ul><li>The total distance moved by the cow </li></ul><ul><li>= 3 m + 4 m </li></ul><ul><li>= 7 m </li></ul><ul><li>(b) Displacement of the cow </li></ul><ul><li>= √3 2 + 4 2 </li></ul><ul><li>= 5 m due to North East </li></ul>
  19. 19. QUESTION 2 : O A B <ul><li>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 : </li></ul><ul><li>The total distance travelled </li></ul><ul><li>The displacement from O </li></ul><ul><li>The average speed of the cyclist </li></ul><ul><li>The average velocity of the cyclist </li></ul>150 m 200 m
  20. 20. ANSWERS 2 : O A B 150 m 200 m
  21. 21. <ul><li>Total distance travelled </li></ul><ul><li>= 150 m + 200 m </li></ul><ul><li>= 350 m </li></ul><ul><li>(b) Displacement </li></ul><ul><li>= √150 2 + 200 2 </li></ul><ul><li>= 250 m due North East </li></ul>
  22. 22. <ul><li>(c) Average speed </li></ul><ul><li>= 350 m </li></ul><ul><li> 25 s </li></ul><ul><li>= 14 ms -1 </li></ul><ul><li>(d) Average velocity </li></ul><ul><li>= 250 m </li></ul><ul><li> 25 s </li></ul><ul><li>= 10 ms -1 </li></ul>
  23. 23. REFLECTION / CLOSURE (EVALUATION)
  24. 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. 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. 26. <ul><li>DISPLACEMENT </li></ul>
  27. 27. <ul><li>distance </li></ul>
  28. 28. <ul><li>SPEED </li></ul>
  29. 29. <ul><li>VELOCITY </li></ul>

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