1. Motion Section 3 Acceleration

2. Acceleration Measured in meters per second per second or m/s2
A change in speed is caused by:
Acceleration – increasing speed
Deceleration – decreasing speed
negative acceleration
- can change an objects direction
Measured in meters per second per second or m/s2

3. Calculating Acceleration
Acc. = Change in speed
Time
A car travels at 60m/s. It speeds up to 80m/s in 5 seconds. What is the acceleration?

4. Practice
A roller coaster is moving at 35 m/s at the bottom of a hill. 4 seconds later at the top it is traveling 15 m/s. What is the deceleration?

5. Graphing Acceleration
Speed vs. Time graph
Slope is equal to the acceleration of the object.
distance vs. time graph - a curved line means the object is accelerating.
Speed
time