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Average Speed

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A track star runs the 5k (5 kilometers) race in 15 minutes (900 seconds) ... A sprinter moves from the starting blocks traveling from rest to 9 meters per ... – PowerPoint PPT presentation

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Title: Average Speed


1
Average Speed
  • total distance
  • total elapsed time
  • v d/t

2
Average Speed(When only speeds are known)
  • If only speeds are known, then the average
    speed is the sum of the speeds divided by the
    total number of values.
  • FOR EXAMPLE Find the average speed of 3m/s, 5
    m/s and 8 m/s ?
  • Average speed (3 5 8)/3 5.33 m/s

3
Example of Average Speed
  • A track star runs the 5k (5 kilometers) race
    in 15 minutes (900 seconds). What is the average
    speed of the runner?


4
Example of Average Speed
  • A track star runs the 5k (5 kilometers) race
    in 15 minutes (900 seconds). What is the average
    speed of the runner?
  • V total distance /total time

5
Example of Average Speed
  • A track star runs the 5k (5 kilometers) race
    in 15 minutes (900 seconds). What is the average
    speed of the runner?
  • V total distance /total time
  • V 5000 m/900 s

6
Example of Average Speed
  • A track star runs the 5k (5 kilometers) race
    in 15 minutes (900 seconds). What is the average
    speed of the runner?
  • V total distance /total time
  • V 5000 m/900 s 5.55 m/s

7
Instantaneous Speed
  • very short distance
  • very short time
  • v Dd
  • Dt

8
Example of Instantaneous Speed
  • While running a track star covers a distance of
    one meter in 0.24 seconds. What is his
    instantaneous speed ?

9
Example of Instantaneous Speed
  • While running a track star covers a distance of
    one meter in 0.24 seconds. What is his
    instantaneous speed ?
  • V ?d /?t

10
Example of Instantaneous Speed
  • While running a track star covers a distance of
    one meter in 0.24 seconds. What is his
    instantaneous speed ?
  • V ?d / ?t V 1 m / 0.24s

11
Example of Instantaneous Speed
  • While running a track star covers a distance of
    one meter in 0.24 seconds. What is his
    instantaneous speed ?
  • V ?d / ?t V 1 m / 0.24s
  • V 4.17 m/s

12
Velocity
  • Speed in a particular direction

13
Acceleration
  • Change in velocity
  • Change in elapsed time
  • a Dv
  • D t

14
Example of Acceleration
  • A sprinter moves from the starting blocks
    traveling from rest to 9 meters per second in 1.5
    seconds. What is the persons acceleration ?

15
Example of Acceleration
  • A sprinter moves from the starting blocks
    traveling from rest to 9 meters per second in 1.5
    seconds. What is the persons acceleration ?
  • a V final - V initial
  • t final - t initial

16
Example of Acceleration
  • A sprinter moves from the starting blocks
    traveling from rest to 9 meters per second in 1.5
    seconds. What is the persons acceleration ?
  • a V final - V initial 9 m/s 0
  • t final - t initial
    1.5 s 0

17
Example of Acceleration
  • A sprinter moves from the starting blocks
    traveling from rest to 9 meters per second in 1.5
    seconds. What is the persons acceleration ?
  • a V final - V initial 9 m/s 0
    6 m/s2
  • t final - t initial
    1.5 s 0
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