1. TEST TOMORROW OVER MOTION GRAPHS
You will be given three review sheets today...you will NOT turn them in.
Answers are on back counter and in Fusion.
You may complete your foldable at home tonite for an additional review. You may turn it in as you enter class tomorrow to replace your lowest DAILY grade.

2. VOCABULARY FOR MOTION IN ONE-DIMENSION –
These terms and definitions should be in your notebooks/spirals/etc.
Motion
A change in position measured by distance and time.

3. VOCABULARY FOR MOTION IN ONE-DIMENSION –
These terms and definitions should be in your notebooks/spirals/etc.
Distance
How far something has moved.

4. VOCABULARY FOR MOTION IN ONE-DIMENSION –
These terms and definitions should be in your notebooks/spirals/etc.
Displacement
How far something is from where it began.

5. VOCABULARY FOR MOTION IN ONE-DIMENSION –
These terms and definitions should be in your notebooks/spirals/etc.
Speed
How fast something is moving measured in m/s, for example.

6. VOCABULARY FOR MOTION IN ONE-DIMENSION –
These terms and definitions should be in your notebooks/spirals/etc.
Velocity
The speed AND direction of a moving object.

7. VOCABULARY FOR MOTION IN ONE-DIMENSION –
These terms and definitions should be in your notebooks/spirals/etc.
Acceleration
The rate speed OR direction changes. (The rate the velocity changes)

8. VOCABULARY FOR MOTION IN ONE-DIMENSION –
These terms and definitions should be in your notebooks/spirals/etc.
Slope
rise/run

9. Now draw 5 graphs like the one above and label them Distance vs Time
Now draw 5 graphs like the one above and label them Distance vs Time. Leave room beside each one for notes.

10. What does this value represent?
Time is always plotted on the x-axis.
Distance is always plotted on the y-axis.
On a distance-time graph, how would you write the SLOPE in words? ___/___
What does this value represent?

11. This object is at rest. WHY?

12. This object is moving with CONSTANT SPEED
This object is moving with CONSTANT SPEED. This will always be a straight line.

13. A steeper line indicates a higher speed
A steeper line indicates a higher speed. All lines are STRAIGHT, so all speeds are CONSTANT! Which is traveling the slowest?

14. A curved line going upward shows an increase in speed
A curved line going upward shows an increase in speed. It is accelerating. What would a curved line going downward show? Is this still accelerating?

15. You do have a homework assignment…..
Time for practice
You do have a homework assignment…..

16. Have your “notebooks” ready for notes as soon as the tardy bell rings please.
Quick review before quiz.
Your scantrons are on back counter alphabetically by last name!
Title of notes: Motion in One Dimension
We now have a classroom set of Chromebooks so cell phones are not allowed in class after the bell rings.

17. Let’s walk….talk…..

18. What about this one?

19. And finally this one…..

20. Okay…..one more

21. Time for short quiz- you may use your notes, etc
Cell phones are prohibited in this classroom - Chrombook Room!

22. Let’s summarize!!!!!

23. Now draw 5 graphs like the one above and label them Velocity vs Time
Now draw 5 graphs like the one above and label them Velocity vs Time. Leave room beside each one for notes.

24. Time is on the horizontal axis always.
On a velocity time graph, the slope would be v/t.
velocity/time gives us acceleration.
So the slope of a velocity-time graph gives us acceleration.
Time is on the horizontal axis always.
Horizontal line (zero slope) means ZERO acceleration! So the speed is constant.

25. Where would this line need to be for the object to be at rest - not moving?

26. Increasing speed. The object is accelerating!
REMEMBER:
Slope of a velocity-time graph gives us acceleration.
Increasing speed.
The object is accelerating!

27. Decreasing speed.
The object is still accelerating!
Moving object is decelerating!

28. Now, slope of a velocity-time graph equals acceleration.
The steeper the line, the greater the acceleration.

29. Summary…….

30. Graded Assignment

31. Motion Graphs - review before activity…...
You need your notebooks/spirals.
Draw the following in your notebook:

32. distance-time velocity-time
What can you read directly from the graph?
What does the slope tell you?
What does area tell you?
What can you read directly from the graph?
What does the slope tell you?

33. Do not move from your general area - Just pivot or slide desks!
Get in your groups of 2-4
Do not move from your general area -
Just pivot or slide desks!

34. Acceleration - Time Graphs
Please begin putting this information in your notes! Answer the two questions!
What type of motion is illustrated by this graph?
What can you read directly from this graph?

36. Let’s Review…..
1. What is the displacement of the cross-country team if they begin at the school, run 10 miles and finish back at the school?
2. What is the distance and the displacement of the race car drivers in the Indy 500?

37. v = d/t so d = vt
This is the same thing as finding area (length x width) for the graph below.

38. Area under curve for v-t graph equals displacement.

39. What was object’s displacement at: 2 s? between 2-8 s?

40. Worksheet to be turned in today.

41. Equations for Motion in One Dimension

42. Speed: how far an object travels in a given time interval
Velocity includes directional information:

43. Acceleration – the rate at which velocity changes over time
Instantaneous velocity- the velocity of an object as some instant or at a specific point in the object’s path
Acceleration – the rate at which velocity changes over time
an object accelerates if its speed, its direction, or both change

44. 2-4 Acceleration
Acceleration is the rate of change of velocity.

45. 2-4 Acceleration
Acceleration is a vector, although in one-dimensional motion we only need the sign.
The previous image shows positive acceleration; here is negative acceleration:

46. 2-4 Acceleration
There is a difference between negative acceleration and deceleration:
Negative acceleration is acceleration in the negative direction as defined by the coordinate system.
Deceleration occurs when the acceleration is opposite in direction to the velocity.

47. 2-5 Motion at Constant Acceleration
The average velocity of an object during a time interval t is
The acceleration, assumed constant, is

48. 2-5 Motion at Constant Acceleration
In addition, as the velocity is increasing at a constant rate, we know that
Combining these last three equations, we find:
(2-8)
(2-9)

49. 2-5 Motion at Constant Acceleration
We can also combine these equations so as to eliminate t:
We now have all the equations we need to solve constant-acceleration problems.
(2-10)
(2-11a)
(2-11b)
(2-11c)
(2-11d)

50. my.hrw.com
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