1. Acceleration
(Mr. Giles’ car)

2. Which car will finish first?
The Big Race
Which car will finish first?

3. Acceleration
Any change in velocity or direction

4. Accel.= (final velocity – initial velocity)/time
Acceleration
Acceleration= rate of change in velocity
Accel.= (final velocity – initial velocity)/time or
a= (vf – vi) / t
Units: a=m/s/s

5. Acceleration (Practice Problem)
A roller coaster has a velocity of 10m/sec at the top of a hill. Two seconds later it reaches the bottom of the hill with a velocity of 20m/sec. What is the Acceleration of the roller coaster?
Acceleration=(Velocity final – Velocity initial)/time
Acc.=(20m/s – 10m/s)/2s
Acc.=5m/s/s

6. If a car is traveling down the road and comes to a stop what is happening to the velocity?
Velocity is decreasing
If velocity is decreasing it means we have a change in velocity and therefore we can calculate accel.
This type of acceleration is also known as Deceleration or negative acceleration.

7. Negative Acceleration (Deceleration Practice Problem)
A roller coaster is moving at 25m/s at the bottom of a hill. Three seconds later it reaches the top of the next hill, moving at 10m/s. What is the deceleration of the roller coaster?
Acceleration=(Velocity final – Velocity initial)/time
Acc.=(10m/s – 25m/s)/3s
Acc.= -5m/s/s

8. Graphing Acceleration
What would the graph look like of these three cars???
Blue Car
Red Car
Green Car

9. Graphing Acceleration (Rightward + Changing Velocity)
What would the graph of this car look like???