LAB 1: INTRODUCTION TO MOTION

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Lab 1: Uniform Motion can walk steadily without the sudden changes of speed that occur as you push off with one foot and then stop with the other. 3. Check your prediction using the motion detector. Make sure you are already moving slowly and steadily when you start to record so that you don’t record the motion as you speed up from a standing start. We will look at that motion later on. Repeat until you get a graph you're satisfied with. Note that it is difficult to obtain a smooth line since you don’t really move smoothly when you walk, so ignore the smaller bumps that are mostly due to your steps. You will get a smoother graph if you shuffle rather than taking big steps. 4. On the same set of axes, predict the velocity-time graph you will get walking in the positive x direction medium fast and steadily. Check your prediction. 5. On the same set of axes, predict the velocity-time graph you will get walking in the negative x direction medium fast and steadily. Check your prediction. Question 2-1: What is the most important difference between the velocity-time graph made by walking slowly and one made by walking away more quickly? Question 2-2: How are the velocity-time graphs different for motion in the positive x direction and the negative x direction? Question 2-3: Can you tell, from a velocity-time graph, your position when you started walking and where you were when you stopped walking? Explain. Activity 2-3: Position-Time and Velocity-Time Graphs of the Same Motion Prediction: Using a dashed line draw the position-time and velocity-time graphs you would expect if you were to: 1. walk away from the detector slowly and steadily for about 5 seconds, then 2. stand still for about 5 seconds and then 3. walk toward the detector steadily about twice as fast as before Once again, assume you can walk steadily without sudden changes of speed as you push off with one foot and then stop with the other. Page 1- 8
Lab 1: Uniform Motion Compare your predictions and see if you can all agree. Procedure: Open the experiment file L1A2-3 and test your prediction. Draw the best graph on the axes above using a solid line. Be sure the 5-second stop shows clearly. Question 2-4: The velocity is the slope of the position-time graph. Explain how this is demonstrated from your graphs. Question 2-5: In producing the above velocity-time graph, did it matter where you started i.e. your initial position? Did you have any difficulty with walking the full 5s after the stop? Explain. Measuring the Velocity from the Slope of the Position-Time Graph: As you are now aware the position-time graph for an object traveling at constant velocity is a straight line. And, as you have observed, the faster you move, the more inclined is your position-time graph. The slope of a position-time graph is displacement divided by change in time. It is a Page 1- 9
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LAB 1: INTRODUCTION TO MOTION

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