1. Do Now Complete this on your Daily Organizers:
Is it possible for an object to move at a high speed for 10 seconds without any change in average velocity? How is it possible, or why is it not?
You have to drive into town to take care of some errands. Would you expect to always have the same velocity? Why or why not?
If the lake is 12 miles away from town and it takes you 48 minutes to reach town, what is your average velocity in miles/min?

2. Today’s Agenda Do Now Important Dates Acceleration Exit Ticket 5 min

3. Today’s Agenda Do Now Important Dates Acceleration Exit Ticket 5 min

4. Important Dates & Reminders
Homework This Week
HW assigned today is the last for the quarter 
Grades and Extra Credit
All grades updated in TeacherEase
All assignments and extra credit due Wednesday
Quiz Tomorrow on Speed & Velocity
Difference between Speed & Velocity
Finding Speed, Distance and Time using the equation
Fall Break Oct. 11 – 14 
Flag Football Game Saturday

5. Today’s Agenda Do Now Important Dates Acceleration Exit Ticket 5 min

6. Acceleration
Speed it up!

7. Acceleration
Def.: Change in velocity

8. Check for Understanding
What two components make up velocity?

9. Check for Understanding
Velocity
Speed
Direction

10. Acceleration Def.: Change in velocity
Can be change in speed or direction
(speed up, slow down, or change direction)

11. Check for Understanding
Is this ball accelerating?
Yes! Because the direction is changing.

12. Which cars are accelerating?B C
Cars B and C!

13. Acceleration
Acceleration is not just a change in velocity, it’s how fast that change happens.

14. Which car has the greatest acceleration?B C
Car C!

15. Acceleration
To measure it, you must know the initial velocity, the final velocity, and the time it takes to make the change.

16. Acceleration Acceleration = ∆v/ t Def.: Change in velocity
Can be change in speed or direction
(speed up, slow down, or change direction)
Acceleration = ∆v/ t

17.  - Greek letter delta – “change in”
Acceleration
Initial Velocity – An object’s velocity when you start measuring acceleration.
Final Velocity – An object’s velocity when you finish measuring acceleration.
 - Greek letter delta – “change in”

18. Acceleration = change in velocity time
The unit for acceleration is m/s2.  v a = t

19. Acceleration
v is the difference between the final velocity (vf) and the initial velocity (vi).
v = vf - vi

20. Acceleration can be positive or negative.
If the object is “speeding up,” then the acceleration of the object is positive.
The change in velocity is an increase
Ex: 5 mph North to 10 mph North
If the object is “slowing down,” then the acceleration of the object is negative.
The change in velocity is a decrease
Ex. 5 mph North to 0 mph North

21. Acceleration Acceleration = ∆v/ t Def.: Change in velocity a = vF – vI
Can be change in speed or direction
(speed up, slow down, or change direction)
Acceleration = ∆v/ t
a = vF – vI t

22. Example 1
A roller coaster’s velocity at the top of a hill is 10m/s. Two seconds later it reaches the bottom of the hill with a velocity of 26m/s. What is the acceleration of the roller coaster?

23. Answer vf = 26 m/s vi = 10 m/s t = 2 s Acceleration = ∆v/ t
a = 26m/s – 10m/s
2 s
a = 16m/s 2s
a = 8m/s/s or 8m/s2

24. Examples 2-4 – Try them!
2. A car travels at 60 miles per hour around a curve. Is the car accelerating?
3. A car travels in a straight line at 60 mi/hr. Is the car accelerating?
4. A car goes from 20 m/s to 50 m/s in 6 seconds. What’s the car’s acceleration?

25. Answers:
1. Yes! Because it’s changing direction. 2. No! It’s not changing speed or direction. 3. vF = 50 m/s vI = 20 m/s t = 6 s a = vf – vi t a =5 m/s2

26. What if I’m not looking for a?
You can also find Vf, Vi and t using the same equation! (We’ll only do Vf and t though)
Set it up with what you know and SOLVE.
Example:
A bug is accelerating at a rate of 2 m/s2. If it started at rest (0 m/s), how long will it take it to get to 6 m/s?

27. Example
A bug is accelerating at a rate of 2 m/s2. If it started at rest (0 m/s), how long will it take it to get to 6 m/s?
A = VF – VI 2 m/s2 = 6 m/s – 0 m/s
t t

28. Example
A bug is accelerating at a rate of 2 m/s2. If it started at rest (0 m/s), how long will it take it to get to 6 m/s?
A = VF – VI 2 m/s2 = 6 m/s – 0 m/s
t t
2 m/s2 = 6 m/s t

29. Example
A bug is accelerating at a rate of 2 m/s2. If it started at rest (0 m/s), how long will it take it to get to 6 m/s?
A = VF – VI 2 m/s2 = 6 m/s – 0 m/s
t t
2 m/s2 = 6 m/s t = 6 m/s
t m/s2

30. Example: Finding Time T = 3 s
A bug is accelerating at a rate of 2 m/s2. If it started at rest (0 m/s), how long will it take it to get to 6 m/s?
A = VF – VI 2 m/s2 = 6 m/s – 0 m/s
t t
2 m/s2 = 6 m/s t = 6 m/s
t m/s2
T = 3 s

31. Example: Finding VF Let’s say you wanted to find the final velocity.
A ball has a an acceleration of –2 m/s2. It starts out at 12 m/s. What will be its velocity after 3 seconds?

32. Example: Finding VF Let’s say you wanted to find the final velocity.
A ball has a an acceleration of –2 m/s2. It starts out at 12 m/s. What will be its velocity after 3 seconds?
What does having a negative velocity mean?

33. Example: Finding VF Let’s say you wanted to find the final velocity.
A ball has a an acceleration of –2 m/s2. It starts out at 12 m/s. What will be its velocity after 3 seconds?
How do we set this problem up?

34. Example: Finding VF 2 m/s2 = VF – 12 m/s 3 s
Let’s say you wanted to find the final velocity.
A ball has a an acceleration of –2 m/s2. It starts out at 12 m/s. What will be its velocity after 3 seconds?
How do we set this problem up?
2 m/s2 = VF – 12 m/s
3 s

35. Example: Finding VF 2 m/s2 = VF – 12 m/s 3 s 6 m/s = VF – 12 m/s
Let’s say you wanted to find the final velocity.
A ball has a an acceleration of –2 m/s2. It starts out at 12 m/s. What will be its velocity after 3 seconds?
How do we set this problem up?
2 m/s2 = VF – 12 m/s
3 s
6 m/s = VF – 12 m/s

36. Example: Finding VF 2 m/s2 = VF – 12 m/s 3 s 6 m/s = VF – 12 m/s
Let’s say you wanted to find the final velocity.
A ball has a an acceleration of –2 m/s2. It starts out at 12 m/s. What will be its velocity after 3 seconds?
How do we set this problem up?
2 m/s2 = VF – 12 m/s
3 s
6 m/s = VF – 12 m/s
VF = 6 m/s

37. Guided Practice
For the following guided practice problems, we will be using the multiple choice notecards. Grab a stack for you!

38. MC 1 What will cause acceleration? Speeding Up Slowing Down
Changing Direction
Any of the above

39. MC 1 Answer What will cause acceleration? Speeding Up Slowing Down
Changing Direction
Any of the above

40. MC 2
What are the units for acceleration? m
m/s
m/s2 s

41. MC 2 Answer
What are the units for acceleration? m
m/s
m/s2 s

42. MC 3
If an object starts at rest and ends at 10 m/s, what is its initial velocity?
0 m/s
5 m/s
10 m/s
Not enough information

43. MC 3 Answer
If an object starts at rest and ends at 10 m/s, what is its initial velocity?
0 m/s
5 m/s
10 m/s
Not enough information

44. MC 4
Emanuel speeds up from 4 m/s to 8 m/s in 2 seconds. What was Emanuel’s acceleration?
2 m/s2
-2 m/s2
4 m/s2
-4 m/s2

45. MC 4 Answer
Emanuel speeds up from 4 m/s to 8 m/s in 2 seconds. What was Emanuel’s acceleration?
2 m/s2
-2 m/s2
4 m/s2
-4 m/s2

46. MC 5
A car accelerates from 10 m/s to 50 m/s in 5 seconds. What is the car’s acceleration?
5 m/s2
8 m/s2
10 m/s2
40 m/s2

47. MC 5 Answer
A car accelerates from 10 m/s to 50 m/s in 5 seconds. What is the car’s acceleration?
5 m/s2
8 m/s2
10 m/s2
40 m/s2

48. MC 6
If Brandon starts at rest and accelerates at 0.5 m/s2, how long does it take him to reach his top speed of 3 m/s? What is his initial velocity?
0 m/s
0.5 m/s
1.5 m/s
3 m/s

49. MC 6 Answer
If Brandon starts at rest and accelerates at 0.5 m/s2, how long does it take him to reach his top speed of 3 m/s? What is his initial velocity?
0 m/s
0.5 m/s
1.5 m/s
3 m/s

50. MC 7
If Brandon starts at rest and accelerates at 0.5 m/s2, how long does it take him to reach his top speed of 3 m/s? What is his final velocity?
0 m/s
0.5 m/s
1.5 m/s
3 m/s

51. MC 7 Answer
If Brandon starts at rest and accelerates at 0.5 m/s2, how long does it take him to reach his top speed of 3 m/s? What is his final velocity?
0 m/s
0.5 m/s
1.5 m/s
3 m/s

52. MC 8
If Brandon starts at rest and accelerates at 0.5 m/s2, how long does it take him to reach his top speed of 3 m/s? What is his acceleration?
0 m/s2
0.5 m/s2
1.5 m/s2
3 m/s2

53. MC 8 Answer
If Brandon starts at rest and accelerates at 0.5 m/s2, how long does it take him to reach his top speed of 3 m/s? What is his acceleration?
0 m/s2
0.5 m/s2
1.5 m/s2
3 m/s2

54. MC 9
If Brandon starts at rest and accelerates at 0.5 m/s2, how long does it take him to reach his top speed of 3 m/s? Now, answer the question 
0 m/s
1.5 m/s
3 m/s
6 m/s

55. MC 9 Answer
If Brandon starts at rest and accelerates at 0.5 m/s2, how long does it take him to reach his top speed of 3 m/s? Now, answer the question 
0 m/s
1.5 m/s
3 m/s
6 m/s

56. MC 10
A snowmobile has an initial velocity of 3 m/s. If it accelerates at a rate of 0.5 m/s2 for 7 seconds, what is its final velocity?
1.5 m/s
3.5 m/s
6.5 m/s
10.5 m/s

57. MC 10 Answer
A snowmobile has an initial velocity of 3 m/s. If it accelerates at a rate of 0.5 m/s2 for 7 seconds, what is its final velocity?
1.5 m/s
3.5 m/s
6.5 m/s
10.5 m/s

58. Independent Practice
Complete the three independent practice problems on the back of your Daily Organizers. We will also continue practicing this tomorrow in addition to doing a lab 
If you can go from 10 m/s to 70 m/s in 6 seconds, what is your acceleration?
You are speeding in your car on I-40. You see a cop (uh oh). You are going 40 m/s (90 mph). You decelerate (slow down) at a rate of -6 m/s2. How long will it take you to get down to 31 m/s (70 mph – the speed limit)?
An ice cream truck is moving along at 10 m/s. It then speeds up at a rate of 5 m/s2 for 3 seconds. What is the truck’s final velocity?

59. Today’s Agenda Do Now Important Dates Acceleration Exit Ticket 5 min

60. Exit Ticket
Exit tickets will be my daily way of seeing whether or not you have understood the objectives we have gone over during class each day.
They will NOT be graded for accuracy but WILL be graded for completion so make sure you always try each and every question.
These exit tickets must be done silently and independently. If you violate this, you will lose your participation points for the day.
You must wait to begin your exit ticket until Ms. Kemal says to begin.

61. Exit Ticket
While drag racing out of our school parking lot, I time myself at a speed of 42 m/s after 7 seconds. What was my acceleration during this time?
If I start at rest and then accelerate at a rate of 3 m/s2 for 9 seconds, how fast would I be going?
If I were to drop a ball out of my car while I was traveling at a velocity of 25 m/s, and it underwent an acceleration of -5 m/s2 while rolling to a stop, how long would it take for it to stop?

62. Exit Ticket Answers Acceleration = (42 m/s) / 7 s = 6 m/s2
vF = at = (3 m/s2)(9 sec) = 27 m/s
12.5 s