Hollow pendulum barrel experiment device for measuring gravity acceleration

Abstract

The invention provides a hollow pendulum barrel experiment device which processes data accurately and conveniently, is suitable for operation by students and is used for measuring gravity acceleration. The hollow pendulum barrel experiment device is composed of a hollow pendulum barrel and two sets of cylindrical weights with the same height and different radiuses. A compound pendulum system is formed by the hollow pendulum barrel and the cylindrical weights, first a swing period of the compound pendulum system is obtained after different amounts of weights are added, and a gravity acceleration computation formula is obtained by analyzing influences of the two sets of weights. Compared with an existing method, the gravity acceleration is obtained by fitting a slope of a straight line, thehollow pendulum barrel experiment device has the advantages of being simple in experimental method and convenient in data processing, the complex experimental data processing process is avoided, experimental data precision is improved, the experiment device is convenient to operate, a principle is easy to understand, and the experiment device is suitable for physics experiment teaching.

Description

technical field [0001] The invention relates to an experimental device, in particular to a hollow pendulum experimental device for measuring the acceleration of gravity. Background technique [0002] The experiment of measuring the acceleration of gravity with a compound pendulum is one of the demonstration experiments in university physics. Generally, the J-LD23 compound pendulum experimental device is used, that is, a slender pendulum with circular holes at equal intervals. The surface of the pendulum is marked with vertical scales. Hang the round hole of the pendulum on the bracket for swinging, record the distance from the round hole to the center of the pendulum and the swing cycle when the round hole is suspended, complete multiple sets of experiments, and then draw on the coordinate paper, using the graphic method Perform data processing and calculate the acceleration due to gravity. [0003] The method of processing the experimental data of the compound pendulum to ...

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Problems solved by technology

[0004] In the actual operation process, the above-mentioned widely used compound pendulum measurement gravitational acceleration experiment has the following difficulties. The first is that the periodic curve is a traced curve. Unlike the fitted straight line, it is very difficult for beginners to describe an accurate curve; There is a deviation between the traced periodic curve and the real curve, so the coordinate values ​​of the four points where the straight line parallel to the abscissa axis intersects the periodic curve must also have deviations; third, because the measurement points are discrete data, the abscissa interval is generally 2cm , such an interval is difficult to find exactly the same measurement points for four periods in reality

In summary, there are large deviations in the existing measurement acceleration experiments, and the data measurement and processing process is also relatively cumbersome and time-consuming

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