Physics Lab Report #1

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Brooklyn College, CUNY *

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PHYS1100

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Physics

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Feb 20, 2024

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doc

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3

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Professor Franco 8/28/13 Measurements – Acceleration of Gravity \ 1
The purpose of this experiment is to measure the gravitational acceleration of various objects from different heights in order to see what effects gravity has on these objects. For the first part of the experiment, each lab team was given a specific height to perform the experiment at. In this part of the experiment, our goal was to get the average of different time measurements at a constant height. For the second part of the experiment, we used the combined set of values from the whole class in order to determine the data at various heights. Computed Results from Table 1 (Heavier Steel Ball) Average time 0.4484 (s) Standard deviation 2.22x10^-3 (s) Experimental value of free fall time from distance of 100 cm .4484 ± 2x10^-3 (s) Acceleration due to gravity 995 cm/s² Computer Results from Table 3 (Lighter Steel Ball) Average time: 0.4488 (s) Computed Results from Table 4 (Heavier Steel Ball) Average acceleration 1001.6 cm/s² Standard deviation 13.945 cm/s² Experimental value 1001.6 ± 13.945 cm/s² Percent error 2.20% 2
Slope of graph of (D vs T avg²) 488.5 cm/s² Experimental value from graph 977.0 cm/s² Percent error 0.39% Answers to lab questions 7. According to the law of falling bodies, the time of fall is independent of the weight of the object. After comparing data from the heavier ball and the lighter ball, our results show that this law is valid. 8. After obtaining the data for each group for table 4, we can see that the data of g from the group are approximately the same. Therefore, g is independent of the distance d. 11. The manufacturer of the free-fall timer claims that the timer is accurate to 1%. After seeing our results show only a 0.39% error, its reasonable to believe that manufacturer’s claim is true. 12. Possible uncertainty errors in the experiment may include: incorrect height measurements, possible flaw in the manufacturer’s product, calculation errors, or I did not set up the device properly. After looking at the results of the experiments, it’s clear that the gravitational acceleration of the objects are the same regardless of its weight and height. 3
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