Simple physical pendulum swing rod for measuring gravitational acceleration

Abstract

The invention discloses a simple physical pendulum swing rod for measuring gravitational acceleration and relates to the field of physical experiment equipment. The physical pendulum swing rod is used for overcoming the shortages that the data measurement process and the data processing process are complex and much time is consumed in a physical pendulum gravitational acceleration measurement experiment and reducing deviation caused by calculation. According to the technical scheme, the central axis of the physical pendulum swing rod and the central axis of a hanging rod are perpendicular and intersect, the hanging rod is cylindrical, the two ends of the hanging rod are placed in a pair of grooves, the central axis of the hanging rod is horizontal when the two ends of the hanging rod are placed in the grooves, the swing rod can swing in a reciprocating mode around the central axis of the hanging rod, and the distance h between the centroid of the swing rod and the central axis of the hanging rod is 28.9% of the overall length L of the swing rod, namely, h=0.289L. In order to show that the position of the hanging rod is a suspension point of the smallest swing period, one end of the swing rod or the two ends of the swing rod can adhere to objects and periodical change of the swing rod is observed. The simple physical pendulum swing rod has the advantages that a measuring device and a measuring process are simple and clear, data processing is simple and rapid, and deviation caused by plotting is avoided.

Description

technical field [0001] The invention relates to the field of experimental equipment, in particular to a compound pendulum used in physical experiments to measure the acceleration of gravity. Background technique [0002] In the experiment of measuring the acceleration of gravity with the compound pendulum in the university physics experiment, a long pendulum rod with equidistant circular holes is generally used. There are scales on the surface of the pendulum rod. The hole is hung on the hanging rod (the hanging rod is fixed on the bracket) to swing, measure the swing cycle, record the position coordinates of each hole when hanging (the distance from the round hole to the center of the swing rod, or the origin of other coordinates) and the The swing period when the circular hole is suspended, and then draw a graph on the coordinate paper, and use the graphical method to calculate the acceleration of gravity. [0003] "University Physics Experiment", edited by Wang Zhiheng, ...

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Problems solved by technology

[0005] Since the measurement points are discrete data, the abscissa interval of the discrete data is generally 2cm, and the interval is relatively long. Generally, it is impossible to find that the cycle of the four measurement points is exactly the same. The cycle curve is a traced curve, which deviates from the real curve, so make a The four points where the horizontal line intersects the deviated h-T curve, the coordinate values ​​of the abscissa read from the four points also have deviations, so in addition to the error of the experiment itself, the graphical calculation method also brings a large deviation, Moreover, the data measurement process and processing process are cumbersome and time-consuming

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