LAB 8

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Portland State University *

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201

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Physics

Date

Feb 20, 2024

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docx

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Uploaded by PresidentViper1964

LAB 8 Fearghus Tyler PHYSICS 214 11/18/2023 Introduction: This experiment reviews our previous experiment and extrapolates upon it with the concept of moment of inertia. Moment of inertia is a measurement of an object’s resistance to rotation determined by its mass and perpendicular distance from the center of its mass to an axis of rotation. This experiment collects data from conservation of energy and projectile motion. The data for inertia can be found using this equation: mg∆h = v 0 2 /2 (m + I/r 2 ) In which V is the linear velocity, m is the mass, r is the radius etc. The moment of inertia, g is acceleration and h is height from which the object is dropped. Procedure: Three objects will be used in a similar fashion to lab 4, these will be rolled off a table and an impact site will be recorded. A table will be constructed based on 8.1 provided in the lab manual. An incline will be used with a method of alignment such as a straight edge at the top of the incline. This incline will end 4 inches away from the edge of the table to insure a flat surface. Ramp height will be recorded, as well as drop height. Each object will have data columns in quantities of five trials, giving a well-rounded amount of data to draw from. Data: Ramp Height (∆h): 0.2 m Uncertainty in ∆h: ± 0.01 m

Drop Height (∆y): 1 m Uncertainty in ∆y: ± 0.01 m

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Going back over the values, my estimation for the change in x values for the ball and the hollow tennis ball are higher than experiments revealed. The value for the coin was much lower. I believe rounding errors could contribute to this discrepancy. I see that the data portrays it is easier to estimate a ball like object than a coin, as I had predicted.

Conclusion: Experiments have shown that in measuring and predicting as well as calculating that conservation of energy and projectile motion behave as expected. It was found that the moment of inertia was not quite as consistent or like these objects. Behavior does seem to vary based on the objects in question. This experiment revealed the importance of understanding rotational motion and the moment of inertia. If I could go over the experiment again, I would evaluate the objects behavior at differing heights.

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