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Mass of the ball (kg) 0.5 Position Time (s) position (m) 0 0.03 4.85 0.11 0.44 3.82 0.23 0.85 2.56 0.35 1.06 1.37 0.45 1.15 0.38 0.49 1.21 0.01 0.56 1.12 -0.07 0.67 1.03 -1.72 0.75 0.82 -2.46 0.84 0.55 -3.51 1.02 0.05 -4.95 After release On the way up On the way up On the way up Before the Top Top of path After the Top going down going down going down Before catch Velocity (m/s) GPE (J) KE (J) TE (J) ` Lab 8 “Energy of a Tossed Ball.” Motion Detector In this experiment, we will study energy changes using a Motion Detector. OBJECTIVES: • • Measure the change in the kinetic and potential energies as a ball moves in free fall. See how the total energy of the ball changes during free fall. MATERIALS: Computer Lab Pro Logger Pro Vernier Motion Detector Basketball; PRELIMINARY QUESTIONS: For each question, consider the free-fall portion of the motion of a ball tossed straight upward, starting just as the ball is released to just before it is caught. Assume that there is very little air resistance. 1. What form or forms of energy does the ball have while momentarily at rest at the top of the path? _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ 2. What form or forms of energy does the ball have while in motion near the bottom of the path? _______________________________________________________________________________________ _______________________________________________________________________________________ _______________________________________________________________________________________ 3. Sketch a graph of velocity vs. time for the ball, kinetic energy vs. time for the ball, and potential energy vs. time for the ball. 1 PROCEDURE: 1. Measure and record the mass of the ball you plan to use in this experiment. 2. Connect the Motion Detector to the DIG/SONIC 1 channel of the interface. Place the Motion Detector on the floor and protect it by placing a wire basket over it. 3. Hold the ball directly above the Motion Detector. Have your partner click to begin data collection. Toss the ball straight upward above the Motion Detector and let it fall back toward the Motion Detector catch the ball before it hits the detector. Note: Use two hands, be sure to pull your hands away from the ball after it starts moving so they are not picked up by the Motion Detector. Throw the ball so it moves vertically above the detector. Verify that the position vs. time graph corresponding to the free-fall motion is parabolic in shape, without spikes or flat regions, before you continue. This step may require some practice. If necessary, repeat the toss, until you get a good graph. When you have good data on the screen, proceed to the Analysis section. 4. Click on the Examine button, , and move the mouse across the position or velocity graphs of the motion of the ball to answer these questions. a. Identify the portion of each graph where the ball had just left your hands and was in free fall. Determine the position and velocity of the ball at this time. Enter your values in your data table. (after release) b. Identify the point on each graph where the ball was at the top of its path. Determine the time, position, and velocity of the ball at this point. Enter your values in your data tab

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