1. Acceleration

2. Bell Ringer (9/16)
Describe the motion of the graph below.

3. Lets look at the v vs. t graph….
How is the velocity changing over time for the previous graph?
Time
Velocity

4. Acceleration

5. Acceleration
The rate at which an object changes its velocity and/or direction

6. Using terms we’ve learned, what does this pedal do?
What pedal is this?
Using terms we’ve learned, what does this pedal do?
Changes the rate of speed over time

7. Acceleration Acceleration occurs when an object Speeds up (+)
Slows down (-)
Change in direction

8. Galileo rolled balls down a series of ramps.
As the ramps got higher, the balls rolled at a greater speed.
Their speed increased.
Galileo said that they were…..
Accelerating.

9. Positive & Negative Acceleration
Positive acceleration
“speeding up”
Negative acceleration
“slowing down”

10. Graphing Acceleration
Distance
Time
Time
Velocity

11. Graphing Acceleration
Distance
Time
Time
Velocity

12. Describe the motion in each of these graphs.
Time
Velocity
Distance
Time

13. Practice Problem
Describe the motion of the object at each part on the graphs.
Time
Velocity D E F
Distance
Time A B C

14. Bell Ringer 9/19 Which of the following is not accelerating?
A car slowing to a stop at a stop sign
You riding a Ferris Wheel
The moon orbiting the Earth
A cyclist riding constantly at 2 m/s on a straight path

15. Kinematic Curves w/s