1. Acceleration!

2. Acceleration Units: km/h2 or m/s2 The rate at which velocity changes
A = velocity final - velocity initial vf-vi
time t
Units: km/h2 or m/s2

3. Positive Acceleration
Analyze this graph!
vel ocit y
Positive Acceleration

4. Deceleration or negative acceleration
Analyze this graph!
vel ocit y
Deceleration or negative acceleration

5. What is the acceleration of a car which starts at rest and increases speed to 100m/s in 5 seconds ?
G: U:
F: S:
time = 5 seconds initial v = 0 m/s final v = 100 m/s
Acceleration
A = vf - vi t
A = 100m/s s A = 20 m/s2
A = 100m/s – 0 m/s s

6. What is the acceleration of a car which starts at 200m/s and comes to a stop in 10 seconds ?
G: U:
F: S:
time = 10 seconds initial v = 200 m/s final v = 0 m/s
deceleration
A = vf - vi t
A = -200m/s s A = -20 m/s2
A = 0m/s – 200 m/s s

7. The change in position over time compared to a reference point.
motion

8. How fast an object moves or the rate of motion
Speed!

9. Total distance divided by total time.
Average Speed

10. Describes how fast an object moves (its speed) and direction.
Velocity

11. The rate at which velocity changes.
Acceleration

12. Skydiving: A Case Study
Video on Skydiving
When do you think you accelerate the most?
Scientific Proof