Movement

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  • What yuni is move?
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  • What the bird is move?
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  • a. 54= ... m/s ; 36 = ... m/s = 0.5 m/s2
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  • Movement

    1. 1. MOTION Anatasari Surya, S.Pd Junior High School State 1 Metro1
    2. 2. To understand the concept of movement, work, force, and energy in our daily life Standard Competence 2
    3. 3. To analyze experimental data of uniform straight motion and uniformly accelerated straight motion, and its application in everyday life Basic Competence 3
    4. 4. • To find the characteristics of Uniform Linear Motion • To define acceleration as a speed changes per time taken • To find the distance based on time taken Indicator 4
    5. 5. • Motion • Virtual Motion • Relative motion • Point of reference • Distance • Displacement • Speed • Velocity • Acceleration • Deceleration • Uniform motion • Uniformly acceleration motion 5 Science Words
    6. 6. Use the ground as reference! What she is move? Look at the picture! 6
    7. 7. What bird is move..? Use the ground as reference 7
    8. 8. Mention the objects are move and motionless!! Use the ground as reference 8
    9. 9. • 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 Conclude: 9
    10. 10. ..... • 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. 10
    11. 11. Distance = 200 m Displacement = 200 m to rigth 200 m What is difference between distance and displacement?
    12. 12. 0 1 2 3 4 5 6 7 8 9 A C B 2 134 Distance = 13 m Displacement = 5 m to rigth m What is difference between distance and displacement?
    13. 13. conclude • 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
    14. 14. Distance = 35 m Displacement = 15 m to left What its distance? What its displacement? 10 m 25 m 1.
    15. 15. What difference between a distance and a displacement ? 120 m 150 m 150 m Distance = Displacement = A B C 270 m 90 m Exercise! 2.
    16. 16. A B 30 meters 30 meters Romi run around from A to B. Calculate the distance and displacement! Exercise Distance = 60 m Displacement = √1800 m = 30 √2 m 3.
    17. 17. 4. Initial position of adi is 0 m from the reference of point. He walking as far as 5 m to right and then return to left as far as 9 m. Calculate the distance and displacement! -4 -3 -2 -1 0 1 2 3 4 5 m
    18. 18. Speed and Velocity
    19. 19. 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?
    20. 20. Speed = the number of velocity. (scalar quantity) Speed = distance time Velocity = the change of position of each time. (vector quantity) Velocity = displacement time
    21. 21. scalar quantity: Speed = magnitude, and unit vector quantity: Velocity = magnitude, unit and direction For example: The speedometer of motorcycle shows 50 km/hour to west • Speed = 50 km/hour • Velocity = 50 km/hour to west
    22. 22. 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
    23. 23. A B C D E 500m 200 m 300 m 400 m 350 m
    24. 24. Exercise: Yuni runs 120 m in 1 minute. What is her running speed? Known : s = 120 m t = 1 minute = 60 s Question : V =….? Answer : V = s / t = 120 / 60 = 2 m/s
    25. 25. • a friend told you that he could ride his bike at a speed of 18 km/hour. To find out whether you could ride faster, you needed 30 seconds to go as far as 180 m. Who rade faster, your or your friend?
    26. 26. Average speed 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 ….
    27. 27. Example Budi rides a bicycle traveling 20 km in 20 minutes. And then he travels 16 km in 10 minutes. Find the Budi’s average speed! State your answer in meter/second. s = 20 km + 16 km = 36 km = 36,000 meter t = 20 minutes + 10 minutes = 30 minutes = 1800 seconds v = s : t = 36,000 m : 1800 s = 20 m/s 7
    28. 28. v = s1 + s2 + s3 t1 + t2 + t3 = 5000 + 10000 + 10000 600 + 900 + 300 = 25000 1800 = 13.89 m/s b. 50 km/hour
    29. 29. Exercise : 1. The velocity of a car when it is moving are as follow:  the first 10 minutes, the distance is 5 km.  the second 15 minutes, the distance is 10 km  the third 5 minutes, the distance is 10 km. Calculate : a. the average velocity b. express the average velocity in km/hour.
    30. 30. 2. Sebuah bus melaju di jalan tol yang lurus. Selama 30 menit pertama bus itu menempuh jarak 45 km, 15 menit selanjutnya menempuh jarak 15 km, dan 15 menit selanjutnya menempuh jarak 20 km. Calculate the average speed that bus!
    31. 31. LINEAR ACCELERATE MOTION (LAM) It is linear motion whose velocity is changing/varying regularly
    32. 32. ACCELERATION • 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
    33. 33. Acceleration • Acceleration denotes the change of velocity per unit of time. (Vector Quantity) acceleration decleration • The formula : a = vt – v0 or a = v/ttt – t0 With : a = acceleration (m/s2) vt = The final velocity (m/s) v0 = the initial velocity (m/s) velocity acceleration velocity acceleration
    34. 34. Equation of Motion • Mathematical relations relating motion variables are called equation of motion • For motion with constant acceleration, the variables are: • Displacement : s • Initial velocity : v0 • Final velocity : vt • Constant acceleration : a • Time taken : t
    35. 35. Examples 1. A car changed its speed from 36 km/hour to 72 km/hour in 10 seconds. Calculate the car’s acceleration. Known : vo = 36 km/hour = 10 m/s vt = 72 km/hour = 20 m/s t = 10 s Question : a …?
    36. 36. Answer : • a = vt – vo • • = 20 – 1010 = 1 m/s2 t
    37. 37. • A car changed its speed from 36 km/hour to 54 km/hour within 10 seconds. Calculate the car acceleration! • a truck move by velocity as 7 m/s in 1 second. and then in 2 second the velocity becomes 9 m/s. Calculate the acceleration?
    38. 38. Linier Motion • Linier motion is defined as a motion that has a linier path. • Linier motion with constant velocity is called a regular linier motion. • Linier motion with constant acceleration is called a dynamic linier motion.
    39. 39. Displacement-time graph • 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.
    40. 40. Displacement (m) Time (s) Zero gradient – stationary object
    41. 41. Displacement (m) Time (s) Fixed gradient-uniform velocity
    42. 42. Displacement (m) Time (s) Increasing gradient – increasing velocity
    43. 43. Displacement (m) Time (s) Decreasing gradient – decreasing velocity
    44. 44. Graph of Linier Motion • 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 Distance (m) Time (s) 1 20 10 2 40 20 3 60 30 4 80 40 5 100 50 6 120 60
    45. 45. Distance - Time Graph • If something is not moving, a horizontal line is drawn. • If something starts out slow and then speeds up, its change in speed can look like this.
    46. 46. Eg. • A motorcycle move linier with velocity 60 km/hours. Calculate the distance travelled by motorcycle after 2 hour and ½ hour! And make a graph! hour distance 1 -> 60 km/h 2 -> 2 x 60 = 120 km/h ½ -> ½ x 60 = 30 km/h
    47. 47. Learning Checkpoint This graph shows several stages of motion: • Stage 1: 100 m in 10 s • Stage 2: 50 m in 10 s • Stage 3: 150 m in 20 s Calculate the speed as indicated by each of the colors. Calculate the average speed. What is the total distance? What is the displacement?
    48. 48. Solution Stage 1: S= d/ t 100 m/ 10 s= 10 m/s Stage 2: S= d/t 50 m/ 10 s= 5 m/s Stage 3: S= d/t 150 m/ 20 s= 7.5 m/s Ave Speed= Tot d/ Tot t 300 m/ 40 s= 7.5 m/s Distance = 300 meters Displacement = 0 meters
    49. 49. Consider the following position-time curve. Graphical Analysis of 1-D Motion slope of curve is: RUN RISE m = 12 12 t-t x-x = t x ∆ ∆ = Slope of a P-t curve at any time is object’s v at that time. time (s) position(m) 0 5 10 15 0 1 2 3 4 5 6 7
    50. 50. Analysing motion graph 15 3 9 Displacement (m) Time (s) What is the displacement of the Object after 3 seconds? What is the velocity during : - the first 3 seconds - the next 3 seconds? Displacement = 15 m Velocity : the first 3 s = 5 m/s the next 3 s = 0
    51. 51. Find object’s velocity at t = 0 to 3.0 s and at t = 6.0 to 7.0 s. s0-s3 m0-m15 = t x v ∆ ∆ =  t x v ∆ ∆ =  s6-s7 m15-m0 = ( )→= s m 5 ( )←= s m 15- (–) sign indicates that the object is moving opposite to how it started (which we assumed was the (+) direction). time (s) position(m) 0 5 10 15 0 1 2 3 4 5 6 7
    52. 52. Analysing motion graphs. Time (s) Displacement (m) 10 20 30 40 50 60 120 100 80 60 40 20 What is the displacement after 25 seconds? What is the velocity during: - the first 25 s? - the next 15 s?
    53. 53. A particle in a magnetic field moves as follows: Find the velocity for each part of the motion
    54. 54. Velocity-time graph • 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.
    55. 55. Examples 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.
    56. 56. Several examples of velocity-time graph • Regular / uniform linier motion Velocity (m/s) 0 Time (s) Uniform velocity – zero acceleration
    57. 57. Accelerated dynamic linier motion Velocity (m/s) Time (s)0 Uniform acceleration
    58. 58. Velocity (m/s) Time (s) Increasing acceleration
    59. 59. Decelerated dynamic linier motion Velocity (m/s) Time (s) Uniform deceleration
    60. 60. Velocity (m/s) Time (s) Decreasing acceleration
    61. 61. Decreasing deceleration Velocity (m/s) Time (s)
    62. 62. Thank you See you next tomorrow

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