Acceleration
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Acceleration

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Acceleration Presentation Transcript

  • 1.
    • Notes: Acceleration
    • CW: Speed, Velocity and Acceleration
    • H: Lesson 17 Acceleration
  • 2. Acceleration February 16, 2009
  • 3. Objectives
    • Define acceleration and deceleration
    • Describe the relationship between velocity and acceleration
    • Calculate acceleration
  • 4.
    • Speed –
    • Velocity -
  • 5. Velocities can be combined.
    • Rowing downstream at 16 km/h southeast on a river which is moving 10 km/h southeast
    results in a total velocity of 26 km/h southeast.
  • 6.
    • Rockets are launched in the same direction as the earth rotates.
    • Added boost of 1800 km/h!
  • 7. Acceleration
    • the rate of change in velocity
  • 8. final velocity – initial velocity time Acceleration
  • 9. A = V f – V i T Acceleration equation
  • 10. A =  V T  is pronounced delta
  • 11. Acceleration units
    • km / h /h or km / h 2
    • m/s/s
    • m / s 2
    • km / h /s
    • kilometers per hour per hour
    • meters per second per second
    • kilometers per hour per second
  • 12. Example problem
    • A roller coaster’s speed at the top of a hill is 10 m/s. Two seconds later, it reaches the bottom of the hill with a speed of 26 m/s. What is the acceleration of the roller coaster?
    V i V f t
  • 13. A =  V T Acceleration equation
  • 14. A =  V T
    • Final velocity = 26 m/s
    • Initial velocity = 10 m/s
    • Time = 2 s
    • A = 26 m/s – 10 m/s = 16 m/s = 8 m/s/s
    • 2s 2s
  • 15. Deceleration Negative acceleration
  • 16. Example Problem
    • At the end of a race, a bicycle is decelerated from a velocity of 12 m/s to a rest position in 30 seconds. What is the deceleration of this bicycle?
    V i V f t
  • 17.
    • Final velocity = 0 m/s
    • Initial velocity = 12 m/s
    • Time = 30 s
  • 18. A =  V T Acceleration equation
  • 19. A =  V T
    • Final velocity = 0 m/s
    • Initial velocity = 12 m/s
    • Time = 30 s
    • A = 0 m/s – 12 m/s = -12 m/s = -0.4 m/s/s
    • 30s 30s
  • 20.  
  • 21.
    • If a rocket in space is moving at a constant velocity of 9.8 m/s and then uses its propulsion system to accelerate to 12.0 m/s during a 3.0 minute burn, what would be the acceleration of the rocket?
    • A = V f – V i
    • t
  • 22.
    • If a rocket in space is moving at a constant velocity of 9.8 m/s and then uses its propulsion system to accelerate to 12.0 m/s during a 3.0 minute burn, what would be the acceleration of the rocket?
    • A = V f – 9.8 m/s
    • t
  • 23.
    • If a rocket in space is moving at a constant velocity of 9.8 m/s and then uses its propulsion system to accelerate to 12.0 m/s during a 3.0 minute burn, what would be the acceleration of the rocket?
    • A = 12.0 m/s – 9.8 m/s
    • t
  • 24.
    • If a rocket in space is moving at a constant velocity of 9.8 m/s and then uses its propulsion system to accelerate to 12.0 m/s during a 3.0 minute burn, what would be the acceleration of the rocket?
    • A = 12.0 m/s – 9.8 m/s
    • 3 min
    A = 0.73 m/s/min