1. Chapter 4, Section 3
Acceleration

3. Acceleration
acceleration: the rate at which your speed (or velocity) changes

4. Acceleration
+ a = increasing speed
- a = decreasing speed

5. Acceleration and Speed
Speed and acceleration are not the same thing!
You can be moving at a constant speed, but have no acceleration

6. Acceleration and Speed Exit Slip
SHOW YOUR WORK!
1. A car’s velocity increases from 7.0 m/s to 25.0 m/s in 4.0 seconds. What is the car’s acceleration?

7. Acceleration and Speed-Time Graphs
acceleration = the slope of a speed-time graph
What is the acceleration of the bike?

8. Acceleration and Speed-Time Graphs
steeper line = greater acceleration

9. Acceleration and Speed-Time Graphs

10. Acceleration and Speed-Time Graphs
1. Determine the slope of the line between 0 s and 4 s. What does the slope of the line tell you about the acceleration of the car during this time interval?
2. Describe the speed of the car between 5 and 7 s. What does this tell you about the car’s acceleration?
3. What is the slope of the line between 7 and 9 s? What does this tell you about the car’s acceleration?

11. Acceleration and Graphs of Motion
The position-time graph is curved when an object accelerates