Name: pd: Unit 6, QUICK WARM UP: Thursday 3/9 1) The slope of a distance vs. time graph shows an object s. 2) The slope of a position vs. time graph shows an object s. 3) Can an object have a constant speed but NOT have a constant velocity? Explain by reading and filling out the missing information below: To have a CONSTANT VELOCITY, an object must travel the exact same in the exact same per each exact same unit of. o EXAMPLE OF CONSTANT VELOCITY: every an object travels. To have a CONSTANT SPEED, an object must only travel the exact same per each exact same unit of. o EXAMPLE OF CONSTANT SPEED: every an object travels. The of the motion is irrelevant. An object could be going the exact same per each exact same unit of (have a constant ), BUT, if that object is NOT going in the same, they would NOT have a constant. This is how something could have a constant but NOT constant. 4) a. Explain how you could use a POSITION vs. TIME (Velocity) graph to calculate something s SPEED even when there are negative slopes involved (such as in the one below). b. What is the average SPEED of the object that s motion is graphed below over the whole 12.5 seconds? Show your work/how you figured this out:
Name: Period: UNIT 6 Thursday 3/9 Graphing Motion with a Motion Detector! Using Logger-Pro and the Motion Detector to Analyze Velocity: Set up your motion detector so that you have a straight path out from it about 3-4 meters. *The path must be straight and uninterrupted. **Note: The motion detector will only collect accurate motion data correct motion from about ½ of a meter away and up to 4-5 meters out. Set up your logger pro graph on the computer. *Make sure motion detector and other cords are all attached and connected!!! 2A) Click on the start button in the bottom left corner of the screen 2B) In the search bar, type Logger Pro and click on the program Logger Pro 3.10 to open the program. If things are connected correctly, it will open with a graph that looks like THIS 2C) In the logger pro program opens, go to File OPEN Double click the file named: PHYSICAL SCIENCE W VERNIER Double click the graph file named: 35a Graphing Your Motion (a position vs. time graph should open up ) Once graph 35a is open o Click and drag the position and time axes until it shows 4-5 meters out and about 10-15 seconds of collection time. 2D) Start reading directions for your activity. After each trial/activity, Clear the data. (Experiment clear latest run) However, THIS is NOT the graph you want. To get to the graph you ll be using, follow directions to the left. THIS IS the graph you want! (35a) ****HINT: When you are transcribing a motion graph from the computer to your paper, Use your best judgement to approximate what s being shown on the computer to your paper.
ACTIVITY 1: What does our motion look like on a position vs. graph? Take turns having 1 person in your group to do each of the following activities. When each person is done doing the motion described in their box and their motion graph has been created on the screen, copy (do your best) what the graph looks like on the screen onto this paper into the respective box. Use your best judgement to approximate your drawings on this sheet. **Have one person in the group click the green triangle button to begin data collection (still using graph 35a) and click on the same button to stop data collection after about 5-10 seconds. Clear the data (don t save) between each run. **Note: The motion detector will only collect accurate motion data correct motion from about ½ to ¾ of a meter away and up to 4-5 meters out. What does it look like on a position vs. time graph when someone. 1) Is standing still a couple meters away from the motion detector? 2) Moves towards the motion detector SLOWLY starting away from the detector about 4-5 meters? 3) Moves away from the motion detector at a FAST (still controlled) walk, to about 4-5 meters out? 4) Moves away from the motion detector SLOWLY to about 4-5 meters out? 5) Starts out moving away from the motion detector, then turns around and walks back towards it? (moderate/regular pace)? 6) Moves towards the motion detector at a FASTER (still controlled) walk, starting about 4-5 meters out? 7) Starts out moving very SLOW and ends up walking FAST moving away from the motion detector to about 4-5 meters out? 8) Starts out moving very FAST, then ends up walking very SLOW moving towards the motion detector from about 4-5 meters out? 9) Goes away from and back towards the motion detector several times at a pretty fast (but controlled) walking pace?
ACTIVITY 2: Clear all data and make sure your computer is still showing graph 35a. Each person in the group will move away/towards the motion detector at different rates so that they create a unique graph with 2 TO 3 segments. Your TOTAL motion graph should take 10 seconds (or less). You will then record their motion graph onto your paper. <in some cases you ll have to use your best judgement to distinguish different the different motion segments (graph can sometimes be hard to read)> Then, you ll do their velocity calculations for each segment. Ways you can move to create your unique motion graph: Remember, it s only tracking 2-dimensional motion- no side to side motion will be detected. Only UP TO 3 different segments per person! Feel free to mix up the order and do your own thing! AWAY from the detector. STOPPED, TOWARDS the motion detector PLANNING YOUR 3-segment MOTION GRAPH: FAST motion ( controlled-not running) SLOW motion Segment A: (circle one) I ll do this for about seconds AWAY from the detector FAST AWAY from the detector SLOW BACK Towards the detector FAST BACK Towards the detector SLOW STOPPED Segment B: (circle one) I ll do this for about seconds AWAY from the detector FAST AWAY from the detector SLOW BACK Towards the detector FAST BACK Towards the detector SLOW STOPPED Segment C: (circle one) I ll do this for about seconds AWAY from the detector FAST AWAY from the detector SLOW BACK Towards the detector FAST BACK Towards the detector SLOW STOPPED PERSON 1: Name: s motion graph: 1) On the computer, adjust the time and position intervals so they appear on the graph below (time up to 10 sec., position up to 4 m). 2) Press the start arrow and have the person start doing their motion segments. Press the stop button after 10 sec. 3) Observe the motion graph created on the computer and use it to approximate the start/end points of each segment 4) Record the person s approximate motion graph on the graph on this paper. 5) Calculate the person s different velocities for each of their motion segments in the areas that follow Segment A velocity: Person 1 Segment B velocity: Person 1 Segment C velocity: Person 1 WHOLE 10 seconds AVG. SPEED: person 1 (remember, speed is always POSITIVE. TOTAL (+ and velocities) DISTANCE over TOTAL time!)
PERSON 2: Name: s motion graph: 1) On the computer, adjust the time and position intervals so they appear on the graph below (time up to 10 sec., position up to 4 m). 2) Press the start arrow and have the person start doing their motion segments. Press the stop button after 10 sec. 3) Observe the motion graph created on the computer and use it to approximate the start/end points of each segment 4) Record the person s approximate motion graph on the graph on this paper. 5) Calculate the person s different velocities for each of their motion segments in the areas that follow Segment A velocity: Person 2 Segment B velocity: Person 2 Segment C velocity: Person 2 WHOLE 10 seconds AVG. SPEED: person 2 (remember, speed is always POSITIVE. TOTAL (+ and velocities) DISTANCE over TOTAL time!) PERSON 3: Name: s motion graph: 1) On the computer, adjust the time and position intervals so they appear on the graph below (time up to 10 sec., position up to 4 m). 2) Press the start arrow and have the person start doing their motion segments. Press the stop button after 10 sec. 3) Observe the motion graph created on the computer and use it to approximate the start/end points of each segment 4) Record the person s approximate motion graph on the graph on this paper. 5) Calculate the person s different velocities for each of their motion segments in the areas that follow Segment A velocity: Person 3 Segment B velocity: Person 3 Segment C velocity: Person 3 WHOLE 10 seconds AVG. SPEED: person 3 (remember, speed is always POSITIVE. TOTAL (+ and velocities) DISTANCE over TOTAL time!)
PERSON 4: Name: s motion graph: 1) On the computer, adjust the time and position intervals so they appear on the graph below (time up to 10 sec., position up to 4 m). 2) Press the start arrow and have the person start doing their motion segments. Press the stop button after 10 sec. 3) Observe the motion graph created on the computer and use it to approximate the start/end points of each segment 4) Record the person s approximate motion graph on the graph on this paper. 5) Calculate the person s different velocities for each of their motion segments in the areas that follow Segment A velocity: Person 4 Segment B velocity: Person 4 Segment C velocity: Person 4 WHOLE 10 seconds AVG. SPEED: person 1 (remember, speed is always POSITIVE. TOTAL (+ and velocities) DISTANCE over TOTAL time!)
ACTIVITY 3 (IF TIME) (Physical Science w/ Verneir 35b) ADJUSTING YOUR MOTION! 1) Study the motion graph below. Think about how you would have to move in order to trace the graph shown below. Optional: make a note for each segment describing how you d have to move to obtain a motion graph like this one: 2) Go to File OPEN PHYSICAL SCIENCE W VERNIER 35b Graphing Your Motion **Adjust time intervals on graph if necessary: 3) Each student will attempt to duplicate the motion represented by the graph. Record each student s trial on the graph with their name and explain why they did or did not duplicate the motions (or if there are certain parts that very close or far off). Person 1: Person 2: Person 3: Person 4:
WARM UP: FRIDAY MARCH 10 th, 2017 1) Make up a 5-step motion story to match the position vs. time graph shown below: 2) Is the motion graph above showing speed or velocity? How can you tell?
MOTION DETECTOR VELOCITY INVESTIGATION POST-LAB QUESTIONS: 1) Without the computer, approximate how the following motion stories would look on a position vs. time graph if you were to graph them with a motion detector. a) standing still 1 meter away from the motion detector for the full 10 seconds: b) Starting 3 meters away from the motion detector, and slowly moving towards it: c) starting 3 meters away from the motion detector, and Moving repeatedly, very fast, 1 meter closer to the motion detector, then 1 meter away. d) Starting close to the motion detector and gradually increasing your speed as you move away from it. e) Moving away at a moderate speed, stopping for 1 second, then moving back towards the motion detector. 2) In general, what does the SLOPE of the line tell us in either a distance vs. time OR position vs. time graph? Explain and draw an example: 3) What is the main thing that velocity can tell us that speed does not tell us? 4) In what situations/occupations would knowing something s velocity be more important than just knowing its speed?