Back and Forth Motion
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1 Back and Forth Motion LabQuest 2 Lots of objects go back and forth; that is, they move along a line first in one direction, then move back the other way. An oscillating pendulum or a ball tossed vertically into the air are examples of things that go back and forth. Graphs of the position vs. time and velocity vs. time for such objects share a number of features. In this experiment, you will observe a number of objects that change speed and direction as they go back and forth. Analyzing and comparing graphs of their motion will help you to apply ideas of kinematics more clearly. In this experiment you will use a Motion Detector to observe the back and forth motion of the following five objects: Oscillating pendulum Dynamics cart rolling up and down an incline Student jumping into the air Mass oscillating at the end of a spring Ball tossed into the air OBJECTIVES Qualitatively analyze the motion of objects that move back and forth. Analyze and interpret back and forth motion in kinematics graphs. Use kinematic graphs to catalog objects that exhibit similar motion. MATERIALS LabQuest LabQuest App Motion Detector pendulum with large bob spring with hanging mass meter stick incline with dynamics cart rubber ball (15 cm diameter or more) protective wire basket for Motion Detector protractor PRELIMINARY QUESTIONS 1. Do any of the five objects listed above move in similar ways? If so, which ones? What do they have in common? 2. What is the shape of a velocity vs. time graph for any object that has a constant acceleration? 3. Do you think that any of the five objects has a constant acceleration? If so, which one(s)? 4. Consider a ball thrown straight upward. It moves up, changes direction, and falls back down. What is the acceleration of a ball on the way up? What is the acceleration when it reaches its top point? What is the acceleration on the way down? Physics with Vernier 2-1
2 LabQuest 2 PROCEDURE These five activities will ask you to predict the appearance of graphs of position vs. time and velocity vs. time for various motions, and then collect the corresponding data. The Motion Detector defines the origin of a coordinate system extending perpendicularly from the front of the Motion Detector. Use this coordinate system in making your sketches. After collecting data with the Motion Detector, you may want to print or sketch the graphs for use later in the analysis. For each part LabQuest must be prepared with these two steps: 1. If your Motion Detector has a switch, set it to Normal. Connect the Motion Detector to DIG 1 on LabQuest and choose New from the File menu. If you have an older sensor that does not auto-id, manually set up the sensor. Part I Oscillating Pendulum Motion Detector Figure 1 2. Place the Motion Detector near a pendulum with a length of 1 to 2 m. The Motion Detector should be level with the pendulum bob and about 1 m away when the pendulum hangs at rest. The bob must never be closer to the detector than 0.4 m. 3. Sketch your prediction of the position vs. time and velocity vs. time graphs of a pendulum bob swinging back and forth. Ignore the small vertical motion of the bob and measure distance along a horizontal line in the plane of the bob s motion. Based on the shape of your velocity graph, do you expect the acceleration to be constant or changing? Why? Will it change direction? Will there be a point where the acceleration is zero? 4. Pull the pendulum about 15 cm toward the Motion Detector and release it to start the pendulum swinging. 5. Start data collection. 6. When data collection is complete, a graph of position vs. time will be displayed. If you do not see a smooth graph, the pendulum was most likely not in the beam of the Motion Detector. Adjust the aim and try again. a. To take more data, start data collection after you have released the pendulum. b. Continue to repeat this process until you get a smooth graph. 7. Examine the velocity graph. 8. Answer the Analysis questions for this Part I before proceeding to Part II. 2-2 Physics with Vernier
3 Part II Dynamics Cart on an Incline 9. If your Motion Detector has a switch, set it to the Track position. Place the Motion Detector at the top of an incline that is between 1 and 2 m long. The angle of the incline should be about 5, or a rise of 9 to 18 cm. Back and Forth Motion 10. Sketch your prediction of the position vs. time and velocity vs. time graphs for a cart rolling freely up an incline and then back down. The cart will be rolling up the incline and toward the Motion Detector initially. Will the acceleration be constant? Will it change direction? Will there be a point where the acceleration is zero? 11. Hold the dynamics cart at the base of the incline. Start data collection then give the cart a push up the incline. Make sure that the cart does not get closer to the Motion Detector than 0.15 m for Motion Detectors with a switch or 0.4 m for those without a switch. Keep your hands away from the track as the cart rolls. 12. If you do not see a smooth graph, the cart was most likely not in the beam of the Motion a. To take more data, start data collection when you are ready to release the cart. 13. Examine the velocity graph. 14. Answer the Analysis questions for Part II before proceeding to Part III. Part III Student Jumping in the Air 15. If your Motion Detector has a switch, set it to Normal. Secure the Motion Detector about 3 m above the floor, pointing down. 16. Sketch your predictions for the position vs. time and velocity vs. time graphs for a student jumping straight up and falling back down. Will the acceleration be constant? Will it change direction? Will there be a point where the acceleration is zero? 17. Stand directly under the Motion Detector. 18. Start data collection, then bend your knees and jump. Keep your arms still while in the air. 19. If you do not see a smooth graph, you were most likely not in the beam of the Motion a. To take more data, start data collection when you are ready to jump. 20. Examine the velocity graph. 21. Answer the Analysis questions for Part III before proceeding to Part IV. Part IV A Mass Oscillating at the End of a Spring 22. Place the Motion Detector so it is facing upward, about 1 m below a mass suspended from a spring. Place a wire basket over the Motion Detector to protect it. 23. Sketch your prediction for the position vs. time and velocity vs. time graphs of a mass hanging from a spring as the mass moves up and down. Will the acceleration be constant? Will it change direction? Will there be a point where the acceleration is zero? Physics with Vernier 2-3
4 LabQuest Lift the mass about 10 cm (and no more) and let it fall so that it moves up and down. 25. Start data collection. 26. If you do not see a smooth graph, the mass was most likely not in the beam of the Motion a. To take more data, start data collection when you are ready to release the mass. 27. Examine the velocity graph. 28. Answer the Analysis questions for Part IV before proceeding to Part V. Part V Ball Tossed into the Air 29. Sketch your predictions for the position vs. time and velocity vs. time graphs of a ball thrown straight up into the air. Will the acceleration be constant? Will it change direction? Will there be a point where the acceleration is zero? 30. Place the Motion Detector on the floor pointing toward the ceiling as shown in Figure 2. Place a protective wire basket over the Motion Detector. Motion Detector 31. Hold the rubber ball with your hands on either side, about 0.5 m above the Motion Detector. 32. Start data collection, then gently toss the ball straight up over the Motion Detector. Move your hands quickly out of the way so that the Motion Detector tracks the ball rather than your hand. Catch the ball just before it reaches the wire basket. 33. If you do not see a smooth graph, the ball was most likely not in the beam of the Motion a. To take more data, start data collection when you are ready to toss the ball. 34. Examine the velocity graph. Figure 2 ANALYSIS Part I Oscillating Pendulum 1. Print or sketch the position and velocity graphs for one oscillation of the pendulum. Compare these to your predicted graphs and comment on any differences. 2. Was the acceleration constant or changing? How can you tell? 3. Was there any point in the motion where the velocity was zero? Explain. 4. Was there any point in the motion where the acceleration was zero? Explain. 5. Where was the pendulum bob when the acceleration was greatest? 2-4 Physics with Vernier
5 6. Return to the procedure and complete the next part. Part II Dynamics Cart on an Incline Back and Forth Motion 7. Print or sketch the portions of the position and velocity graphs that represent the time that the cart was going up and down the incline. Compare these to your predicted graphs and comment on any differences. 8. Was the acceleration constant or changing? How can you tell? 9. By hand, add tangent lines to a sketch of the velocity graph to determine the sign of the acceleration of the cart when it was on the way up, at the top, and on the way down the incline. What did you discover? 10. Was there any point in the motion where the velocity was zero? Explain. 11. Was there any point in the motion where the acceleration was zero? Explain. 12. Return to the procedure and complete the next part. Part III Student Jumping in the Air 13. Print or sketch the portion of the position and velocity graphs that represent the time from the first bend of the knees through the landing. Compare these to your predicted graphs and comment on any differences. 14. By hand, add tangent lines to the velocity graph to determine where the acceleration was greatest. Was it when the student was pushing off the floor, in the air, or during the landing? 15. When the student was airborne, was the acceleration constant or changing? How can you tell? 16. Was there any point in the motion where the velocity was zero? Explain. 17. Was there any point in the motion where the acceleration was zero? Explain. 18. Return to the procedure and complete the next part. Part IV Mass Oscillating on a Spring 19. Print or sketch the position and velocity graphs for one vibration of the mass. Compare these to your predicted graphs and comment on any differences. 20. Was the acceleration constant or changing? How can you tell? 21. Was there any point in the motion where the velocity was zero? Explain. 22. Was there any point in the motion where the acceleration was zero? Explain. 23. Where was the mass when the acceleration was greatest? 24. How does the motion of the oscillating spring compare to that of the pendulum? 25. Return to the procedure and complete the next part. Part V Ball Tossed into the Air 26. Print or sketch the portions of the position and velocity graphs that represent the time the ball was in the air. Compare these to your predicted graphs and comment on any differences. 27. Was the acceleration constant or changing? How can you tell? Physics with Vernier 2-5
6 LabQuest By hand, add tangent lines to a sketch of the velocity graph to determine the sign of the acceleration of the ball when it was on the way up, at the top, and on the way down. What did you discover? 29. Was there any point in the motion where the velocity was zero? Explain. 30. Was there any point in the motion where the acceleration was zero? Explain. Analysis of All Parts 31. State two features that the five position graphs had in common. State two ways that the five position graphs were different from one another. 32. State two features that the five velocity graphs had in common. 33. State two ways that the five velocity graphs were different from one another. EXTENSIONS 1. Investigate other back-and-forth motions such as: a. Bouncing balls b. A dynamics cart with a plunger bouncing off a solid object c. A yo-yo 2. Attach an Accelerometer to your belt and use it to analyze your motion when you jump up. Compare your landing acceleration when you bend your knees upon impact and when you do not bend your knees. Safety warning: Jump only a few inches when you do not bend your knees. 3. Use a Force Sensor to measure the force in the vibrating spring and relate this to the kinematic graphs that you observed in this experiment. 2-6 Physics with Vernier
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