1. OK everyone get ready to learn a new vocabulary term.

2. Acceleration
Today we are going to define acceleration.

3. Before we define acceleration, let’s review some other key words we should already know and make sure you are firm in your understanding.

4. speed
Speed is the measure of how far an object travels over a unit of time.

5. Distance
Time
Speed is calculated as distance divided by time.

6. Changing Speed
Changing speed occurs when something is not held constant. Thing about a car accelerating from stop. Your car goes from 0 mph to 25 mph. Here your speed is changing.

7. velocity
Velocity is the speed and direction of a moving object.

9. How do you measure velocity and speed?
Distance / Time

10. Acceleration
Now, let’s define what acceleration means

11. acceleration: a measure of velocity over time
Today we are going to look at acceleration.

12. Velocity
Time
Acceleration is velocity divided by time

13. meters
second
seconds
The units would be meters per second for velocity over seconds (time)

14. meters
seconds2
So the units for acceleration are m / second ^2

15. Now we are going to review what we have learned so far.

16. What is the unit for acceleration?
m/s2
m/s
g/s

17. What is the unit for acceleration?
m/s2
m/s
g/s

18. Acceleration is a measure of___ over time.
Mass
Velocity
Volume

19. Acceleration is a measure o f___ over time.
Mass
Velocity
Volume

20. Velocity increases over time
Acceleration is why velocity increases over time for a car. As you step on the gas your are accelerating the velocity of the car.

21. Direction
Acceleration, like velocity, also also has acceleration.

22. Speeding Up Acceleration Velocity Velocity
Here a car is increasing velocity. As velocity increases, the acceleration is going in the same way.

23. Slowing Down Acceleration Velocity Velocity
Here a car is decreasing velocity. As the cars velocity decreases, the acceleration works in the opposite way.

24. Changing Direction
Acceleration also changes as a car moves around in a circle. Acceleration takes into account both speed and direction. As direction changes, acceleration changes. The acceleration here is different from the next slide because of the direction.

25. Changing Direction
The cars acceleration would be different at this point compared to the last slide.

26. Now we are going to review what we have learned.

27. What two things affect acceleration?
Speed and direction

28. Is this car speeding up or slowly downing?
Acceleration
Velocity
Velocity
Slowing Down

29. How to graph acceleration
Now let’s look at how to graph data about acceleration.

30. Graphing Acceleration
Here is a graph for acceleration.

31. Horizontal
The horizontal axis is used for time. Usually represented in seconds.

32. Vertical
The vertical axis represents the velocity usually shown in m/s

33. Speeding Up
This graph represents an object increasing speed.

34. Decreasing Speed
This graph represents an object decreasing speed.

35. Now let’s review what we have just learned.

36. What goes on the horizontal axis?
Volume
Velocity
Time
Mass

37. What goes on the horizontal axis?
Volume
Velocity
Time
Mass

38. What goes on the vertical axis?
Volume
Velocity
Time
Mass

39. What goes on the vertical axis?
Volume
Velocity
Time
Mass

40. What is acceleration?
The difference in velocity over time.

41. What are the units of acceleration?
M / s ^2

42. Remember!!!
So remember!
<keep this slide>

43. acceleration: a measure of velocity over time
Today we are going to look at acceleration.

44. Thanks for watching, and please continue watching CAPs available from this website.

45. Questions or Comments to Michael Kennedy, Ph.D.
This Video Created With Resources From:
Cooperative Agreement # R324B130023
Curry School Foundation’s Research and Development Fund
Questions or Comments to Michael Kennedy, Ph.D.

46. Activity
Objective: For students to understand the differences between speed, velocity, acceleration. Activity: Students will work through a mini lab and a worksheet. The worksheet allows them to work on calculations and the mini lab allows you to see acceleration.
Materials:
Small ramp
Small car
Time
5 books
Resources: