PHYS101_Gravity_2019.pdf - McGill University Physics 101 Experiment 1 Measuring the gravitational acceleration g#� F = m#� g g= ∆v ∆t Figure 1 A

PHYS101_Gravity_2019.pdf - McGill University Physics 101...

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McGill University Physics 101 Experiment 1 Measuring the gravitational acceleration, g F = m g g = Δ v Δ t Figure 1: A view of the IOLab device used in this lab. Fall 2019, v3.0
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Introduction The gravitational acceleration, g , is the acceleration of an object in free-fall near the surface of the Earth caused by the force of gravitation. Regardless of the mass, the acceleration of the center of mass of objects in the Earth’s gravitational field near the surface is always the same, as long as air resistance is neglected. The accepted value used for g is 9.80655 m/s 2 , with an uncertainty on the final digit. In this experiment, you will measure the gravitational acceleration g by analyzing the free fall of a ‘ladder’ made of Lego blocks. A flashlight and the light sensor on the IOLab device will be used to track the position of the falling ladder as a function of time. Calculating the change in the speed of the ladder will allow you to measure g. In addition to your measured value of g , you will be estimating its uncertainty . Note that this uncertainty is not the difference between your value and the known, high-precision (“true”) value of g = 9 . 80655 m/s 2 quoted above. The uncertainty we want you to estimate arises from uncertainties on your measured data (distances and times). How precisely can you do? You’ll get a chance to compare your results to others, at the end of this lab. But throughout the lab, as in the other labs, you should be asking yourself: “How can I make a better (ie, more precise) measurement?”, and seeking to reduce your uncertainty. The lab process and your report As in all our labs in this course, you will carry out manipulations of the equipment and analysis of
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  • Fall '17
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