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Lab Report 7 - Work and Energy II

Lab Report 7 - Work and Energy II - Work and Energy II...

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Work and Energy II Physics 101 Section 9

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Introduction : In this lab we were asked to perform a series of tasks in order to test the relationship between work and kinetic energy. Ideally, we wanted to prove that the amount of work done equals the change in kinetic energy, in other words, test the validity of the Work-Energy Theorem. In order to do so we experimented with a cart on a track being pulled by the force applied by a hanging mass that was being run through the Data Studio Smart Pulley. We also preformed the same experiment for experiment two, but this time using an inclined track. In our third experiment, we used a simple pendulum to test this theorem as well, and determine the velocity of the pendulum’s hanging mass given that we knew all the other variables needed in the Work-Energy Theorem. After performing these experiments we then drew further conclusions about them and addressed the validity of the Work-Energy Theorem. Procedure : For the first experiment, we wanted to measure the work done by the cart and the change in its kinetic energy. When dealing with work, you must account for all forces on the cart, one of which was friction. In order to simplify our experiment we chose to eliminate friction and did so by simply hanging paperclips on the other end of the string that was run through the Smart Pulley. As we applied more and more paperclips, we pushed the cart from rest and eyed it to see if the cart was moving at a constant velocity and with an acceleration of zero. Once we thought the cart was moving at a constant velocity, we used Data Studio to measure the actual velocity and acceleration of the cart. When Data Studio indicated that we did achieve constant velocity and zero acceleration we then proceeded to perform our experiments. After eliminating friction from the rest of our experiments using the track, we hung a mass at the end of the string with the paperclips to apply the necessary force to pull the cart across the track. We then used Data Studio to determine the work done by the cart and its change in kinetic energy. We did this by imputing two equations into Data Studio and graphing them on the same axis. The equations we used were simply the equations for work and the change in kinetic energy, and after defining all the variables in the equations except displacement and velocity we were able to let Data Studio determine the work and change in kinetic energy as we let the cart move across the track and the hanging mass fell toward the ground. For the second experiment we used a similar approach, but this time we used an inclined track so, in turn, we had to account for the different forces on the cart, mainly gravity.
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Lab Report 7 - Work and Energy II - Work and Energy II...

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