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a power point presentation on chapter 8 MOTION of Physics

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  1. 1. Motion Virtual Motion Relative motion Point of reference Distance Displacement Speed Velocity Acceleration Deceleration Uniform motion Uniformly acceleration motion Science Words
  2. 2. Use the ground as reference! What she is
  3. 3. Use the ground as reference
  4. 4. Use the ground as reference
  5. 5. Motion is a change of position with respect to a point of reference. Point of reference is something that is considered fixed and used as a comparison. Motion very dependent on point of reference Satu titik acuan melihat suatu gerak sangat lambat Titik acuan lain melihatnya sangat cepat Sedangkan titik acuan yang lain lagi melihatnya diam
  6. 6. ..... Motion dependent on point of reference is relative motion Virtual motion is looks like motion but actually it is not motion, example: Sun rises in the east and sets in the west When you are inside a moving bus and look towards the window you will see trees moving away from you.
  7. 7. Distance = 200 m Displacement = 200 m to rigth 200 m What is difference between distance and displacement?
  8. 8. 0 1 2 3 4 5 6 7 8 9 A C B 2 134 Distance = 13 m Displacement = 5 m to m What is difference between distance and displacement?
  9. 9. Distance is length of all lines passed through by an object scalar quantity -> have: magnitude and unit Diplacement is position change of an object from the initial point Vector quantity -> have: magnitude, unit, and direction
  10. 10. Distance = 35 m Displacement = 15 m to left What its distance? What its displacement? 10 m 25 m 1.
  11. 11. Speed and Velocity
  12. 12. 0 4 Time (second) the moving object is identified by its change of position of a point of reference If we want to know how far the position has changed, we must know the concept about velocity Why the change of position of car is longer than a bicycle?
  13. 13. WHAT DIFFERENCE BETWEEN A DISTANCE AND A DISPLACEMENT ? 200 m 250 m 150 m Distance = Displacement = A B C 450 m 150 m Speed and Velocity If Budi go to C from A in 5 seconds that : Speed = Velocity = 90 m/s 30 m/s
  14. 14. Average speed is the total traveled distance divided by the total time needed to travel that distance Average speed = total distance total time v = s1 + s2 + s3 …… t1 + t2 + t3 ….
  15. 15. Symbol: a Formula: acceleration = change of velocity time taken SI Unit : m/sec2 The same formula can also be applied for deceleration, but the value of a is negative
  16. 16. Acceleration denotes the change of velocity per unit of time. (Vector Quantity) acceleration decleration The formula : a = vt – v0 or a = v/t tt – t0 With : a = acceleration (m/s2) vt = The final velocity (m/s) v0 = the initial velocity (m/s) velocity acceleration velocity acceleratio n
  17. 17. Mathematical relations relating motion variables are called equation of motion For motion with constant acceleration, the variables are: Displacement : s Initial velocity : v Final velocity : u Constant acceleration : a Time taken : t
  18. 18. A displacement-time graph shows how the displacement of an object changes with time. The gradient of a displacement-time graph represents the velocity of the object.
  19. 19. Displacement (m) Time (s) Zero gradient – stationary object
  20. 20. Displacement (m) Time (s) Fixed gradient-uniform velocity
  21. 21. Displacement (m) Time (s) Increasing gradient – increasing velocity
  22. 22. Displacement (m) Time (s) Decreasing gradient – decreasing velocity
  23. 23. Graph distance on the y-axis and time on the x- axis The velocity is 2 m/s Slope = rise = distance = speed run time N o Distanc e (m) Time (s) 1 20 10 2 40 20 3 60 30 4 80 40 5 100 50 6 120 60
  24. 24. If something is not moving, a horizontal line is drawn. If something starts out slow and then speeds up, its change in speed
  25. 25. A velocity-time graph shows how the velocity of an object changes with time. The gradient of a velocity-time graph represents the acceleration of the object. The area under a velocity-time graph represents the distance traveled by the object.
  26. 26. Velocity (m/s) Time (s) A B C 15 20 50 60O What is the acceleration of the car during the part of the journey represented by: - OA - AB - BC What is the total distance traveled by the Car? Calculate the average velocity of the car for its whole journey.
  27. 27. SEVERAL EXAMPLES OF VELOCITY- TIME GRAPH Regular / uniform linier motion Velocity (m/s) 0 Time (s) Uniform velocity – zero acceleratio
  28. 28. Velocity (m/s) Time (s) Increasing acceleration
  29. 29. Velocity (m/s) Time (s) Uniform deceleration
  30. 30. Velocity (m/s) Time (s) Decreasing acceleration
  31. 31. Decreasing deceleration Velocity (m/s) Time (s)
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