1. Acceleration- Change in Velocity
occurs when an object ______________ in speed.
occurs when an object __________ in speed.
occurs when an object _____________________

2. Types of acceleration Increasing speed Decreasing speed
Example: Car speeds up at green light
Decreasing speed
Example: Car slows down at stop light
Changing Direction
Example: Car turns
screeeeech

3. How can a car be accelerating if its speed is a constant 65 km/h?
Question 1
How can a car be accelerating if its speed is a constant 65 km/h?
_______________________________________

4. Calculating Acceleration
Acceleration = Final speed – Initial speed
Time

5. Calculating Acceleration
Acceleration = 16m/s - 0m/s 4s
Acceleration = _______
0 s
1 s
2 s
3 s
4 s
0 m/s
4 m/s
8 m/s
12 m/s
16 m/s

6. Question 2 a = m/s – m/s a = ____ a = __________ s
A skydiver accelerates from 20 m/s to 40 m/s in 2 seconds. What is the skydiver’s average acceleration?
a = m/s – m/s s
a = ____
a = __________

7. Graphing Acceleration
Can use 2 kinds of graphs
Speed vs. time
Distance vs. time

8. Graphing Acceleration: Speed vs. Time Graphs
Speed is increasing with time = accelerating
Line is straight = acceleration is constant

9. Graphing Acceleration: Speed vs. Time Graphs
Rise = 4 m/s
Run = 2 s
In Speed vs. Time graphs:
Acceleration = Rise/Run
= 4 m/s ÷ 2 s = ________

10. Graphing Acceleration: Distance vs. Time Graphs
Curved line means the object is accelerating.
Your speed is increasing. Remember slope = speed.

11. Question 3 How is the speed of the car changing?
Run = 3 s
Rise = -6 m/s
How is the speed of the car changing?
(speeding up, slowing down, or staying the same)
__________________________
2) What is this car’s acceleration?
__________

12. Question 4
Which line(s) represents an object that is accelerating? ________________________________
Which line(s) show positive acceleration?
________________________________
3) Which line(s) show negative acceleration?
4) Which line(s) show constant acceleration?
_________________________________