Acceleration
- 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
- 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
- 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