ࡱ> dfci`` bjbj w0xxxxxxx<EEE@FTGl<eHJ(JJJJJJhSjSjSjS=S@[@'d$ehZh|KduxJJJJJKdxxJJdLLLJxJxJhSLJhSLLrMxxOJH `)<EbKOOd0eOhLhOhxO$LJJJKdKdLJJJeJJJJ<<<D=E<<<E<<<xxxxxx Changing Velocity ADVANCE \d6Introduction In this laboratory you will explore acceleration, the rate at which velocity changes. You will be asked to design an experiment, so you should read the handout before coming to lab and make some predictions about how the glider will accelerate on the track. ADVANCE \d6Textbook Reading Physics 150: Halliday, Resnick, and Walker: Sections 2-5 and 2-6 (pages 17-21). Physics 125: Cutnell and Johnson: Sections 2-3 through 2-6 (pages 34-51) ADVANCE \d6Overview of Laboratory You will first use velocity-time and distance-time graphs to describe motion at constant velocity and motion with constantly changing velocity. You will then design an experiment to explore acceleration on an air track. ADVANCE \d6Objectives: to observe motion at constant velocity and constant acceleration to measure acceleration from the slope of a velocity-time graph to design an experiment that reveals some of the conditions that determine the acceleration of an object. ADVANCE \d6Pre-lab Questions 1. Write down an experience you have had in the last 24 hours which could be accurately described by using the word acceleration. 2. Write the formal physics definition of average acceleration. Hint: if you don't know it, look in your book. 3. What is an example of the units for average acceleration? On the back of this page is a velocity-time graph of the motion of an object. Find its acceleration over the time period after about 1.05 s when its acceleration is constant by determining the slope of the straight line that best fits the data. Report the acceleration with units. What is the acceleration of the object when its velocity is 2 m/s? +2 m/s? 0 m/s? EMBED PBrush \* MERGEFORMAT Write your calculations and results below the graph. Show them to your lab instructor at the beginning of the lab. Your lab grade will depend on doing these exercises before coming to the lab and on the care you take in finding the answers. Motion of an Air-track Glider on a Horizontal Track ADVANCE \d6Equipment Air track with glider ULI with motion detector Experiment file ChangingVelocity1 ADVANCE \d6Introduction Last week you used distance-time graphs to describe motion with constant velocity. You learned how to determine the velocity from the slope of the graph. This week youll explore graphs that show directly how the velocity changes with time. Start the Logger Pro program and open the file ChangingVelocity1. Collect some data to make sure that the motion detector sees only the glider, and not any other object, especially your hand. ADVANCE \d6Practice 1. Using the glider and motion detector, duplicate on the computer the graphs given below as best you can. Draw your best attempt on top of the given graph. You may find it difficult to match them exactly. Approximate the shape of the graphs as well as possible. With each graph, give an explanation of how you performed the experiment, that is, describe how the glider moved. Then draw the second graph requested. A. Distance versus time Describe the motion Sketch the velocity-time graph EMBED Unknown \* MERGEFORMAT EMBED Unknown \* MERGEFORMAT B. Positive velocity versus time Describe the motion Sketch the distance-time graph EMBED Unknown \* MERGEFORMAT EMBED Unknown \* MERGEFORMAT Negative velocity versus time Describe the motion Sketch the distance-time graph EMBED Unknown \* MERGEFORMAT EMBED Unknown \* MERGEFORMAT Now tilt the air track by placing one thick metal block under the leg of the track closest to the motion detector. Place the glider at the far end of the track and release it. Observe its motion, but dont use the ULI yet. Predict the graphs that the computer will display by following this procedure Distance-time graph Velocity-time graph EMBED Unknown \* MERGEFORMAT EMBED Unknown \* MERGEFORMAT At t = 0 (immediately after you released the glider) Where is the glider? How fast is it going? Mark the position on the graph. Mark the speed on the graph. At small t (shortly after you released the glider) Where is the glider? How fast is it going? Mark the position on the graph. Mark the speed on the graph. At the end of its motion (just before it hits the end of the track) Where is the glider? How fast is it going? Mark the position on the graph. Mark the speed on the graph. Now take data and study the distance-time and velocity-time graphs. Draw the results on the axes above, clearly marking which are the predictions and which are the actual motion. Explain below how you can make better predictions in the future. Investigating the Acceleration of a Glider on a Tilted Air Track ADVANCE \d6Equipment Air track with bumpers, glider, and weights Blocks to tilt track ULI with motion detector Program ChangingVelocity2 ADVANCE \d6Introduction If you place a glider on a tilted air track, it will accelerate down the track. How does the acceleration depend on the properties of the glider and its environment? That is, what can you change that changes the acceleration? What is the relationship between the manipulated variables and the resultant variable (the acceleration of the glider)? Just as important, what parameters can you change that have no effect at all on the acceleration? In this part of the laboratory, you will design an experiment to find out. At the end of the laboratory, your instructor will ask you to use your results to predict the acceleration of a glider released in a certain way that has a specified mass and is on an air track tilted to a given angle. ADVANCE \d6Experiment Planning Here is a list of conditions that might affect the acceleration of the glider. Feel free to add others. Initial position of glider on track. Initial velocity of glider (including +, , or 0). Mass of glider. ( Position of detector (upper or lower end of track). Angle air track makes with horizontal. While you are encouraged to explore as many of these parameters as possible, you are required to test the effect of the mass of the glider, the effect of the initial velocity, and the dependence on the angle at which the track is tilted. Experimental Preparation Open the Logger Pro file ChangingVelocity2. Measuring acceleration Before coming to the lab you found the slope of a printed velocity-time graph. The computer can find the best straight-line fit to the velocity-time data. Use the mouse to select the region of the data on the v-t graph that you want to analyze. Click on the curve fit icon: or select Curve fit from the Analyze menu. You will see a menu box. In the box at the lower left select linear. Click on Try Fit. A thin straight line will appear on the graph and numeric values of the slope and intercept will be written in the box under the graph. If you are not satisfied with the fit, you can select a different range of data and try again. When you are satisfied with the fit, click on OK. A floating box will appear on the original graph that shows the parameters of the fit: m, the slope, is the acceleration; b, the intercept, is the velocity at t = 0; St. Dev. Slope measures the uncertainty in the acceleration. If this measure doesnt appear, double-click on the floating box and click on the box for Std. Dev. of Slope. Varying mass You should have four chrome-plated steel cylinders that fit over the pins on the skirts of the glider. Always put them on in pairs, either one or two on each pin. Tilting the track You will find aluminum blocks of various thicknesses on the table. Use them to raise the end of the track closer to the motion detector. You can use them either individually or stack them up. EMBED Unknown \* MERGEFORMAT The sine of the tilt angle of the track can be found by dividing the height of the blocks, H, by the distance between the legs of the air track, L. Note that this distance is measured along the track, not the table. Then, sin  = H/L. ADVANCE \d6Making a Measurement Select one glider mass and track tilt. Decide how your team will collect data, and whether you will simply release the glider from rest or give it a push uphill or downhill. Then try it. Analyze the data as displayed on the velocity-time graph as outlined on the previous page to find the acceleration. ADVANCE \d6Reporting Your Results Dependence of acceleration on mass Description of procedure used: Results (be sure to use appropriate units for each measured quantity): Glider mass (kg) Tilt of track sin    Acceleration (including uncertainty) (m/s2)            Conclusions (Does the acceleration depend on mass?): Dependence of acceleration on initial velocity Description of procedure used: Results (be sure to use appropriate units for each measured quantity): Glider mass (kg) Tilt of track sin   Initial velocity (m/s) Acceleration (including uncertainty) (m/s2)                Conclusions (Does the acceleration depend on the initial velocity? Within your uncertainties, is the acceleration of the glider up the track the same as it is down the track? Attach printed velocity-time graphs to support your conclusions.): Dependence of acceleration on tilt of track Description of procedure used: Results (be sure to use appropriate units for each measured quantity): Glider mass (kg) Tilt of track sin   Initial Velocity (m/s) Acceleration (including uncertainty) (m/s2)                          Use the program Graphical Analysis for Windows to plot your results. Include error bars on acceleration. Decide whether you should plot the acceleration as a function of  or sin . One goal is to find the acceleration that the glider would have if the track were vertical ( = 90o), so plan your graph to be able to answer that question. Describe, according to your experimental data, how the acceleration of the glider depends on the mass of the glider and its initial velocity and the tilt of the track. What acceleration would the glider have under the conditions (mass, initial position, initial velocity, etc.) given you by your instructor if the track were tilted at 90o? Describe any additional experiments in this format on your own paper. Name_____________________________ Lab Section ____ Velocity-time graphs Answer the following questions in the spaces provided 1. a) How do you move to create a horizontal line in the positive part of the v-t graph? b) Draw the motion diagram for your motion.  EMBED Unknown \* MERGEFORMAT  2. a) How do you move to create a straight line v-t graph that slopes up from zero? b) Draw the motion diagram for your motion.  EMBED Unknown \* MERGEFORMAT  3. a) How do you move to create a straight-line v-t graph that slopes down to zero? b) Draw the motion diagram for your motion.  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The v-t graph of an object is shown. Find the total change in position (displacement) of the object. Show your work. Displacement = _________ m EMBED Unknown \* MERGEFORMAT  5. This v-t graph shows the motion of two objects. a) Is one faster than the other? If so, which one? Does it depend on the time? If so, which one, when? b) What does the intersection mean? c) Does either A or B reverse direction? Explain. EMBED Unknown \* MERGEFORMAT  Sketch a velocity-time graph and a motion diagram corresponding to each of the following descriptions of the motion of an object. 6. The object moves away from the origin at a constant velocity. Motion diagram: EMBED Unknown \* MERGEFORMAT  7. The object is standing still. Motion diagram: EMBED Unknown \* MERGEFORMAT  8. The object moves with a steady (constant) velocity toward the origin for 10 seconds and then stands still for 10 seconds. Motion diagram: EMBED Unknown \* MERGEFORMAT  9. The object moves with a steady velocity away from the origin for 10 seconds, then reverses direction and moves at the same speed toward the origin for 10 seconds. Motion diagram: EMBED Unknown \* MERGEFORMAT  10. Draw the velocity-time graphs for three objects. All have accelerations of 0.50 m/s2. One has an initial velocity of +2.0 m/s, the second has an initial velocity of 0 m/s, the third has an initial velocity of 2.0 m/s.        Physics Laboratory Manual. Jan 1999 Changing Velocity - Page PAGE 1 of 10 Physics Laboratory Manual. 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