-I. Colliding gliders ' Two experiments are conducted with gliders on a level.r'ctfonless track. - ' In the first experiment. glider A is launched toward a stationary glider. glider M. After the collision. glider A has reversed directions ' In the second experiment. glider M is replaced by glider N. which has the same mass as glider M. Glider A has the same initial velocity as in experiment 1. After the collision. glider A is at rest.- ' The mass of glider A is much smaller than that of glider M and glider N (Lew ms *i mm = (mg). ' Before collision After collision Experiment 1 Experiment 2 Although gliders M and N have the same mass. glider A has a different nal velocity in each case. 1Which glider. M or N. do you think is made ofmore elastic. \"springier\" material? - ' A student makes the following prediction with regard to the two experiments described above:' ' "In experiment 2, glider N ends up with all ofthe momentum that gliderA had initially. In experiment 1, however, gliderAwill have some momentum left over, so glider M won't get as much momentum as glider N will. So, glider M will have a smaller nal speed than glider N." Do you think the student" 3 prediction is correct? Briey explain why you think it is or is not correct: ' I C. For experiment I. draw and label Free-body diagram for Freebody diagram for separate ee-body diagrams for glider A glider M glider A and glider M at an instant during the collision (is, while the gliders are in contact}. "' I 1 . to "While the gliders are in contact. how does the net force on glider A compare to that on glider M? Discuss magnitude and direction.\" ' rrrrrrrrrrrr an; Tw'hile the gliders are in contact. How does the roduct 1'? . Af com are to the roduct ~ 13 net :1 0 13 13 Fet *M fe, ? Discuss both magnitude and direction. Explain.\" ' ur f momentum vector (g? = m at?) of glider A. "' Use Newton's 2'\" law IE ne! I m ) to express the product 13m .A Af, in terms of the change in a I Similarly. express 13m ~31 diff, in terms of the change in momentum vector of glider M.\" On the basis of your work above. how does the change in momentum vector of glider A compare to the change in momentum vector of glider M? Discuss both magnitude and direction. Explain.\" I D. Now consider glider A and glider N in experiment 2. How does the change in momentum vector of glider A compare to that of glider N? (Him: 1Would the same steps in the reasoning you used in part C above also applyr to the collision between gliders A and N?) ' E. The initial and final momentum vectors for glider A in the two experiments are shown below. ~ Experiment 1 Experiment 2 Glider A Glider M Glider A Glider N Momentum before TITT the collision zero zero Momentum after TT the collision zero Change in momentum 1. In the spaces provided, construct vectors that represent the change in momentum for glider A in the two experiments. Draw your vectors to scale with those already shown. (Hint: Finish the first column in each experiment before looking at the second column.) In which experiment does glider A experience the greater change in momentum: experiment 1 or experiment 2? 2. Complete the table by drawing vectors that represent the change in momentum and final momentum of glider M (in experiment 1) and glider N (in experiment 2). Explain how you can use your results from part C to support your answers. Summarize your results: Which experiences the greater change in momentum: glider M (in experiment 1) or glider N (in experiment 2)? Which of these gliders has the greater final speed? ~ - F. Reread the prediction made by the student in part B. On the basis of your work in parts C and D, you should now find that the student's prediction is incorrect. Identify the underlying error in the student's reasoning. Discuss your answer with your partners