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L3

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  • Transcript

    • 1. Physics L3 www.slideshare.net/DMS_physics
    • 2. Free Fall
      • … occurs if the only force on an object is gravity.
      • Acceleration of gravity
      For convenience we can use g = 10 m/s 2
    • 3. How Fast ? 10t t . . . . 50 5 40 4 30 3 20 2 10 1 0 0 Instantaneous Speed (m/s) Elapsed Time (s)
    • 4. How Fast ?
    • 5. Question
      • What would the speed of the apple be
        • after 4.5s?
        • after 8s?
        • after 15s?
      10t t . . . . 50 5 40 4 30 3 20 2 10 1 0 0 Instantaneous Speed (m/s ) Elapsed Time (s)
    • 6. Speed Graph
      • In Uniform Motion
        • speed is directly proportional to time
        • The graph is a straight line
        • The slope is acceleration
    • 7. Question
      • What would the speed of the apple be
        • after 4.5s?
        • after 8s?
        • after 15s?
      • 45 m/s
      • 80 m/s
      • 150 m/s
    • 8.
      • Acceleration is 10m/s 2 downwards at all times
      • At the same height
        • Speeds are the same
        • Velocities are in the opposite directions
      t = 3s, v = 0m/s t = 2s t = 1s t = 0s t = 4s t = 5s t= 6s t = 7s v = 20m/s v = 10m/s v = 30m/s v = 40m/s
    • 9. t = 3s, v = 0m/s t = 2s t = 1s t = 0s t = 4s t = 5s t= 6s t = 7s v = 20m/s v = 10m/s v = 30m/s v = 40m/s
    • 10. t = 3s, v = 0m/s t = 2s t = 1s t = 0s t = 4s t = 5s t= 6s t = 7s v = 20m/s v = 10m/s v = 30m/s v = 40m/s
    • 11. Average Speed
      • For objects moving with constant acceleration , the average speed is the arithmetic mean (average) of the initial and final speeds.
      10t t . . . . 50 5 40 4 30 3 20 2 10 1 0 0 Instantaneous Speed (m/s ) Elapsed Time (s)
    • 12. How far ?
    • 13. How far ? 5t 2 t . . . . 125 5 80 4 45 3 20 2 5 1 0 0 Distance (m) Elapsed Time (s)
    • 14. Classwork (p.20/Q)
      • An apple falls from a tree and hits the ground in one second.
        • What is its speed upon striking the ground?
        • What is its average speed during this 1s?
        • How high above the ground was the apple when it was dropped?
    • 15.  
    • 16. Homework Assignment
      • P.26 / 16,17,19
        • For a freely falling object dropped from rest, what is the
          • Instantaneous speed at the end of the fifth second of fall?
          • Acceleration at the end of the fifth second of fall?
          • Distance covered by the end of the fifth second of fall?
    • 17. End L3 www.slideshare.net/DMS_physics