Lab211-08Energy_of_Tossed_Ball - Phy 211 General Physics I...

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Phy 211: General Physics I Lab page  1 of 6 Instructor:   Tony Zable Experiment: Energy of a Tossed Ball OBJECTIVES 1. Measure the change in the kinetic and potential energies as a ball moves in “free fall”. 2. See how the total energy of the ball changes during free fall. INTRODUCTION When a juggler tosses a bean ball straight upward, the ball  slows down until it reaches the top of its path and then  speeds up on its way back down. In terms of energy, when  the ball is released it has kinetic energy,  KE . As it rises  during its free-fall phase it slows down, loses kinetic energy,  and gains gravitational potential energy,  PE . As it starts  down, still in free fall, the stored gravitational potential  energy is converted back into kinetic energy as the object  falls. If there is no work done by frictional forces, the total  mechanical energy will remain constant. In this experiment,  you will observe whether or not this works out for the toss of  a ball. In addition, you will study the energy transformations for the ball using a Motion Detector. MATERIALS LabPro Interface basketball or other similar ball Logger  Pro    wire basket Vernier Motion Detector PRELIMINARY QUESTIONS Consider a ball tossed straight upward in free-fall motion, from just as the ball is released to just  before it is caught. Assume that there is essentially no 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. Modified from original file by Vernier Software.
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