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# ex6b - EXPERIMENT 6b Elastic One-dimensional Collisions...

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EXPERIMENT 6b Elastic One-dimensional Collisions Objectives to measure the momentum and kinetic energy of two objects before and after a one-dimensional collision to try to account for any change in KE in the nearly elastic collision compare and contrast the results obtained from the inelastic collision experiment with the results obtained from this experiment Apparatus The same apparatus used in the inelastic experiment will be used in this experiment. However, one of the carts will use an elastic bumper (see Figure 1 below). The second cart will be fitted with a bumper blade which will make contact with the elastic bumper on the first cart during the collision. A bumper blade is on the left hand side of the cart shown in Figure 1 and the elastic bumper is on the right hand side of the cart. Figure 1

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Procedure In this experiment we will try to obtain an almost elastic collision of two carts on the air track. The main difference from the previous lab is that the carts will now move separately after the collision. The elastic bumper allows the carts to bounce off of each other with almost no conversion of kinetic energy into other forms of energy. As before, Cart 2 is initially at rest. Before the collision we have to measure only the velocity of Cart 1, v 1i (Figure 1). However, after the collision we have to measure the velocities of both carts, v 1f and v 2f (Figure 2). Thus, in all we have to measure three times (t 1i , t 1f , and t 2f ), while the photogate system allows us to simultaneously measure only two of them. We can get out of this situation if after the measurement of the initial time t 1 , but before the collision of the two carts, we reset the timer. You will probably have to make several practice trials to learn to quickly remember and reset the contents of the timer before the carts collide. Then, we can again use the contents of the timer display and the memory to find t 1f and t 2f .
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