1. Get out your spirals! And write the critical questions! (right side)
What is the difference between positive and negative acceleration?
Turn in your TYPED Lab-Write Ups into the appropriate tray.
10 points off for every day it is late.

2. Acceleration

3. Acceleration
Acceleration

4. The rate at which velocity changes
Acceleration
Acceleration
The rate at which velocity changes

5. Remember
Velocity

6. Remember
Velocity
The speed and direction an object is moving

7. Acceleration
Acceleration
For a change in velocity, how many velocities do you need? 2

8. Acceleration v1 v2 An original velocity and a final velocity

9. Acceleration
Acceleration
To calculate the change in acceleration you would subtract the velocities
v2 – v1

10. Acceleration
Acceleration
Formula ?

11. Formula # 1
Acceleration
Acceleration
v2 – v1
a = t

12. Acceleration
Acceleration
D =
Greek letter “DELTA”

13. Acceleration D = D v = D v = v2 – v1 DELTA = difference
Difference in velocity
D v =
v2 – v1

14. Acceleration
Acceleration
v2 – v1
a = t

15. Acceleration
Acceleration
D v
a = t
D v =
Difference in velocity

16. Acceleration
Acceleration
UNITS ?

17. Acceleration
Acceleration
m/sec2
miles/hr2
km/hr2

18. Acceleration
Acceleration

19. Formula # 2
Acceleration
Acceleration 2d
a =
t 2

20. Acceleration
Acceleration
Increasing speed,

21. Acceleration
Acceleration
Increasing speed, decreasing speed

22. Deceleration Increasing speed, decreasing speed
Acceleration
Deceleration
Increasing speed, decreasing speed
(Negative Acceleration)

23. Acceleration Increasing speed, decreasing speed or changing direction

24. Acceleration

25. Acceleration
Examples:

26. Acceleration
Examples:
Increasing speed -

27. Acceleration
Examples:
Increasing speed -
Car moves forward

32. Acceleration
Examples:
Increasing speed -
Bat hitting a baseball

34. Acceleration
Examples:
Increasing speed -
Track star running

38. Acceleration
Examples:
Increasing speed -
Shot from a canon

43. Acceleration
Examples:
Increasing speed -
Arrow from a bow

45. Acceleration
Examples:
Increasing speed -
Jet taking off

50. Acceleration
Examples:
Decreasing speed -

51. Examples: Decreasing speed - Opposite of all our
Acceleration
Examples:
Decreasing speed -
Opposite of all our
Increasing acceleration
Examples.
(car coming to a stop)

53. Acceleration

54. Graphing Acceleration

55. Acceleration

56. Acceleration
velocity

57. Acceleration
A plane takes off in 20 seconds at 80 m/s. What is the planes acceleration?
v2 – v1
a = t
End – 80 m/s
Start – 0 m/s
Change in velocity – 80 m/s
Time interval – 20 seconds
Acceleration – 4 m/s2
Velocity (end)
Velocity (start)
Velocity end – Velocity start ___________________________
Time interval
Average Acceleration _____________________________________

58. Acceleration
A bike going 3 m/s comes to a stop in 2 seconds. What was the bikes acceleration?
v2 – v1
a = t
End – 0m/s
Start – 3 m/s
Change in velocity – -3 m/s
Time interval – 2 seconds
Acceleration – (-1.5) m/s2
Velocity (end)
Velocity (start)
Velocity end – Velocity start ___________________________
Time interval
Average Acceleration _____________________________________

59. Acceleration practice
Example: An airplane on the runway clocked at a speed of 8 miles/hour heading East. By the time it takes off from the runway 20 seconds later, it is traveling at 260 miles/hour to the East. What is the plane’s average acceleration?
Velocity (end)
Velocity (start)
Velocity end – Velocity start ___________________________
Time interval
Average Acceleration _____________________________________
v2 – v1
a = t
Velocity (end) 260 miles/hour
Velocity (start) 8 miles/hour
Velocity end – Velocity start 260 – 8 = 252 miles/hour
Time interval 20 seconds
Average Acceleration miles/hour ÷20 seconds = 12.6 miles/hour/second