Lab Report 6 - Work and Energy I

Lab Report 6 - Work and Energy I - Work and Energy I...

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Work and Energy I Physics 101 Section 9
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Introduction : In this lab, we were asked to perform a series of tasks to determine the relationship between the work done by different forces on an object. To do so, we preformed two experiments using a weighed down cart on a frictionless track and recorded its motion as we pulled it for half a meter (.5m). In order to record the force we exerted on the cart as we pulled it across the track, we used a spring force scale that measured the force as the spring stretched. Our results from the spring scale were then transferred into a table of values using the Data Studio program. We were expected to raise one end of the track by placing a two-by-four underneath it, thus giving us an incline. For the first experiment, we pulled the cart up the track, making sure that the spring scale (which was connected to the cart) was parallel to the track. In the second experiment, we repeated the same process but this time, pulling the cart up the track with a force 60º above the incline. Using the same process for each experiment ensured that our results would be more accurate. After completing the experiments we solved for the work done by each force in both trials and were then able to draw several conclusions about the total work on the cart. Procedure : In order to perform both experiments we first had to set up our track, calculate the value of its three sides and determine the total mass of the object we were using, in this case, the cart with one block of weight on it. After weighing both the block and the cart on a digital scale, we then proceeded to set up our track. Once the two-by- four was placed vertically under the track, we then measured its height, thus measuring the height of the incline. We then moved on to determine the length of the inclined track and used the Pythagorean Theorem to solve for the it's base. Knowing all three sides of the triangle formed by the incline, we than solved for the angle at which it was inclined. We did so by using simple trigonometric methods. At this point we were now able to perform our experiments. For the first experiment, we placed the cart about one millimeter off the bottom bumper of the track to ensure that our results wouldn’t conflict with the initial force needed to pull the cart off the bumper.
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