1. Kinematics Terms and Questions
What measures must be known to…
Make a moving object catch a falling object?

2. What should my notebook look like?
Notebooks are a waste, unless YOU can benefit from using them.
The most useful notebook is flexible (in terms of its capacity to organize your work).
Your should have sections for:
Vocabulary
Example problems
Lab Reports
Returned: HW
Labs
quizzes

3. Questions?
What questions must we be able to answer to make a moving object catch a dropped object?
Which object is easier to study first? Why?

4. (Your?) Kinematics Questions (so far…)
How fast…?
How far…?
How long…?
Where…?
When…?

5. Can we answer any of these for the jeep? Which?
How fast…?
How far…?
How long…?
Where…?
When…?

6. “Lab” How fast is the jeep?
Your group report should look just like the solution to a word problem. You do not need to write a word problem, you just need to solve the problem, showing five steps (on a test, you are not required to list the KNOWN measurements, you are here).

7. So, how did we do? What did you calculate for the jeep?
How accurate were we?
What went wrong?
Why?
What will prevent the same mistakes in the future?

8. Speed Trap
Two telephone poles are 130 feet apart. Using a stopwatch, determine the AVERAGE SPEED for a passing car in m/s and miles/hour. For you REPORT:
Write a word problem that includes the measurements needed in SI units, and miles and hours.
Show all five steps to solve your own word problem

9. How Fast Part II
Use the ticker-tape-timer to determine the jeep’s average speed. Stretch yourself, apply some math skills you have used in other applications. Or, play it safe, don’t take a risk. Who needs to grow intellectually, anyway?
Hint: check out PCR kinematics lesson 2b.

10. (Your) Kinematics Questions (after editing)
- - when? - - where is (or was) the object? - - how long does (did) motion take? - - how far does object move? - - how far (and which way) is object from where it started? - - how fast is object moving? - - how fast & which way is it moving?

11. Measurement Names -time - -duration - -position - -distance -
-displacement -
-speed -
-velocity -
-Which of these terms relates two other terms?

12. Time vs Duration What is the difference? What is the same?
Which one must be computed if you use a traditional clock? How do you perform that computation? Which one did you use in the lab today?

13. Distance vs Displacement
What is the difference?
What is the same?
Which measurement matters to a football coach?
Which one affects how tired a running back would be at the end of a play?
Which one is 1600m when the “mile” is run at a track meet?
Which did you use in the lab today?

14. Distance vs Displacement
DISTANCE equals DISPLACEMENT when….
(d = Dx)….
FINAL POSITION equals DISPLACEMENT when…
(xf = Dx)….

15. Distance and Displacement
During a “suicide” athletes start at one end of the gym, sprint to the foul line (15 feet), then back to the end-line, then sprint to the mid-court line (42 feet), then back to the initial end-line, then sprint to the other foul line, then back to the initial end-line, then sprint to the opposite end line, where they are finished. Determine the distance and displacement for each athlete. A diagram of the court would be useful!

16. Use the diagram to determine the distance and displacement of the skier between positions A and D.

17. Evaluate a Classmates Problem Answer yes or no, and explain briefly to:
Is the problem solvable (or already solved correctly)?
Does the problem distinguish between distance and displacement?
Does the problem leave no doubt the solver must understand all the differences between distance and displacement? (Or, could more detail improve the question as an assessment tool?)
Is the problem realistic?
Could this problem be used (as it is written) on an assessment of 1-D Kinematics?

18. POD
Its 3rd and 7 in the last minute of the 4th quarter. Eagles 21, Native Americans 17. Washington is on the Eagles 25 yard line. RG3 takes the hike, and backs up to the 30, fires a pass right over the middle to the newly acquired Jackson. The pass is beautifully thrown, so that even a Physics teacher could catch it. After the catch, Jackson is hit so hard his eyes just about pop out and he is brought down at the 20 yard line. Sketch the number line, with relevant markers. Sketch the path. Compute the displacement for the play. Show all steps!

19. What is the mathematical relationship between ________ (__) and _______ (__) for the jeep that starts at rest near the origin, and moves away from the origin at a constant speed?
What are the simplest two kinematics measurements that will fit this question?

20. Mathematical Relationship Lab #1
What is the mathematical relationship between position (m) and time (s) for a jeep that starts at rest near the origin, and moves away from the origin at a constant speed?
Determine the equation that relates position to time for the jeep (while it is in motion).
Explain what the equation means. (what it tells you)
Prepare for the PLQ

21. What is the mathematical relationship between the position (m) and time (s) for the jeep?
What does the slope of the graph equal?
What would be true of the slope if the jeep was faster?
What if the jeep had gone the other way?
So, the slope of an x vs t graph…

22. A toy jeep moves in front of a motion detector
A toy jeep moves in front of a motion detector. A graph (shown below) of the movement is produced. What is the jeep’s average velocity?

23. Kinematics Problem, cont.
How long would it take for the jeep in the previous problem to travel from the origin to x=3.0m?

24. What is the mathematical relationship between…
position (m) and time (s) for a lab cart, if it starts from rest at x=0.0m at t=0.0s and rolls down an incline?

25. Kinematics MR Lab II Place detector at one end of track
Clear its “view” for the length of the track
In the STH SHARES folder, Student Shares, Honors, open the blank x-t graph.
HOLD cart 50 cm from detector, ZERO
Click green Collect button, wait about 1.0 seconds and let cart go (moving AWAY). Determine if the graph meets the requirements of the objective. If not, repeat.
Sketch graph in your lab notebook, and analyze the graph for the objective of the lab.

26. Speed and Velocity Average and Instantaneous
What is the difference?
What is the same?
What formulas are used?
What do you call the value if the speed of the object isn’t constant?

27. Use the diagram to determine the average velocity and average speed of the skier between positions A and D.

28. Practice
At a CB South track meet, Pat competes in the 1600m (4 laps of the 400m track). Pat completes the first lap of the race in 60.0 seconds, the second lap in 62.0 seconds, the third lap in 73.0 seconds, and the last lap in 65.0 seconds. Compute Pat’s average speed or average velocity (whichever has relevance in this problem).

29. Symbols - Terms - Questions
- - when? - - where is (was) object? - - how long does (did) motion take? - - how far does object move? - - how far (and which way) is object moved from start? - - how fast is object moving? - - how fast & which way is it moving? - - how _________ does the ________ change?

30. Terms – Definitions
-time - -duration - -position - -distance - -displacement - -speed - -velocity - -acceleration - Which of these terms relates two other terms?

31. More Practice… QUEST Kinematics I due Thursday night at 11pm
Get started now, alone, or in pairs

32. What is the mathematical relationship between…
velocity (m/s) and time (s) for the jeep, if it starts at x=0.0m at t=0.0s?
velocity (m/s) and time (s) for the lab cart, if it starts from rest at x=0.0m at t=0.0s?

33. How to get velocity from an x-t graph:
Place detector at one end of track. Clear its “view” for the length of the track.
In the STH SHARES folder, Student Shares, HONORS, open the blank x-t graph.
Place jeep about 50 cm from detector, ZERO
Click green Collect button, wait about 1.0 seconds and let cart go (moving AWAY). Determine if the graph meets the requirements of the objective. If not, repeat. If so, shade the section that is useful.
From the ANALYZE menu, select tangent. Position the cursor at no fewer than five evenly spaced times within the shaded section. Record these times and velocity (slope) values in a table on a white board.
Use Logger Pro on the other computer to manually graph data, analyze, following the 8 steps on WS: Graphing On Logger Pro
Place blue plastic box under end of track w/ detector. Repeat 3-5 with the silver cart.

34. Now, test your predictions on the WS: Constant Acceleration Motion
All the acceleration graphs are…
Why?
All the velocity graphs are…
When there is a curve on an x-t graph, the __________ is changing.

35. Skim PCR Kinematics Lesson 4
Use the CYU to evaluate your learning, plus, answer these questions:
What does the slope of a v-t graph tell you?
What quadrants does a v-t graph need to have? Why?
Is the origin shown on a v-t graph? (How, or why not?)
Can you determine position or displacement from a v-t graph? (How?)

36. Kinematics Terms Organized by …
time position duration distance displacement speed velocity acceleration

37. Terms and Equations
-duration - -displacement - -speed (ave) - -velocity (ave) - -acceleration (ave)-

38. Do you KNOW the Terms? What’s happening if an object has:
Constant position?
Constant VELOCITY?
Constant SPEED?
Constant acceleration?
Constant position is the same thing as zero:
Constant velocity is the same thing as zero:

39. Do you KNOW the Terms?
From a sketch of a position vs time graph OR a velocity vs time graph, you should be able to tell:
The direction of motion (positive or negative)
If speed is constant, increasing or decreasing
Of those things, the only thing an acceleration graph tells is if the speed is constant or changing

40. What is the cause? Is there a cause of If so, what is the cause?
position?
velocity?
acceleration?
If so, what is the cause?

41. A NET Force The cause of acceleration
The result of adding all the forces acting on an object
A vector, and the acceleration it causes is in the same direction