1. Acceleration

2. Cheetah’s Killer Agility

3. Velocity The speed AND direction of an object 50 mph north
20 km/s to the right

4. Types of Motion
1-dimensional
2-dimensional
Circular
Periodic

5. Acceleration The rate at which velocity changes Can be:
Speeding up (positive acceleration)
Slowing down (negative acceleration / deceleration)
Changing direction

7. Are these accelerating?

8. Are these accelerating?

9. Formula for Acceleration
Change in velocity
Acceleration =
Change in time
Final velocity – Initial velocity
Acceleration =
Change in time

10. Units for Acceleration
Unit of distance / unit of time2
Examples:
m/s2
mi/hr2

11. Example Problem
What is the acceleration of a vehicle that changes it’s velocity from 100 km/hour to a dead stop in hr?

12. Example Problem
A helicopter’s speed increases from 25 m/s to 60 m/s in 5 seconds. What is the acceleration of this helicopter?

13. Example Problem
After traveling for 6.0 seconds, a runner reaches a speed of 10 m/s. What is the runner’s acceleration?

14. Example Problem
As she climbs a hill, a cyclist slows down from 25 mi/hr to 6 mi/hr in hrs. What is her deceleration?

15. Example Problem
A skateboarder traveling at 7.0 meters per second rolls to a stop at the top of a ramp in 3 seconds. What is the skateboarder’s acceleration?

16. Example Problem
A cyclist accelerates from 0 m/s to 8 m/s in 3 seconds. What is his acceleration ?

17. Example Problem
You are traveling in a car that is moving at a velocity of 20 m/s. Suddenly, a car 10 meters in front of you slams on it’s brakes. At that moment, you also slam on your brakes and slow to 5 m/s. Calculate the acceleration if it took 2 seconds to slow your car down.

18. Example Problem
A ball is dropped from the top of a building. After 2 seconds, it’s velocity is measured to be 19.6 m/s. Calculate the acceleration for the dropped ball.