Method for measuring gravity acceleration by sleeving cylinder to increase compound pendulum length

Abstract

The invention provides a method for measuring the gravity acceleration by sleeving a cylinder to increase the compound pendulum length, and relates to the field of physical experiment devices and experimental methods. The method is designed to overcome the defect that the measurement process and the data processing process are complex and high in time consumption and to reduce deviation introduced by calculation. According to the technical scheme, a cylindrical hanging rod is fixed to a thin rod, the central axis of the thin rod and the central axis of the hanging rod are perpendicular and intersect, the two ends of the hanging rod are placed in a pair of grooves, the central axis of the hanging rod is horizontal after the two ends of the hanging rod are placed in the grooves, and the thin rod can swing around the central axis of the hanging rod in a reciprocating mode; the distance h between the mass center C of the thin rod and the central axis of the hanging rod is larger than 0.30 time of the length L of the thin rod and smaller than 0.35 time of the length L of the thin rod; a sleeve rod is fixed to the upper end of the thin rod and shares the same central axis with the thin rod, the cylinder, the sleeve rod and the thin rod are made of the same material, the periphery of the cross section of the cylinder and the periphery of the cross section of the thin rod are the same in shape and equal in size, and the gap between the cylinder and the sleeve rod is too small and can be omitted. The method has the advantages that a measurement device and the measurement process are simple and clear, and data processing is easy and rapid.

Description

technical field [0001] The invention relates to the field of experimental equipment and experimental methods, in particular to the experiment of measuring the acceleration of gravity with a compound pendulum in a physical experiment. 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 Ph...

AI Technical Summary

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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