Method for measuring gravitational acceleration by pressurizing and increasing pendulum length of compound pendulum

Abstract

The invention discloses a method for measuring gravitational acceleration by pressurizing and increasing the pendulum length of a compound pendulum, and relates to the field of physical test equipment and test methods. The method is designed in order to overcome the defects that the data measuring process and the data processing process are tedious and consuming in time and to reduce deviation caused by calculation. According to the technical scheme, a pendulum rod of the compound pendulum is an air bag, the upper end face and the lower end face of the air bag are respectively coated with a planar metal supporting mesh, and the side face of the air bag is coated with a spiral spring; a metal ring is arranged on the outer side of one end of the air bag, and a hanging rod is fixed on the metal ring; the lower end of one n-shaped or two n-shaped rigid plastic frames or light hard metal frames or the lower end of a set of light hard metal mesh is fixed on the metal ring, the upper end of the one n-shaped or two n-shaped rigid plastic frames or light hard metal frames or the upper end of the set of light hard metal mesh is fixedly connected with the pendulum rod air bag, and the pendulum rod air bag is provided with an air inlet hole with a one-way valve; the hanging rod is horizontally placed in a pair of grooves; the distance h from the mass center C of the pendulum rod air bag to the central axis of the hanging rod is 0.20-0.25 the length L of the pendulum rod. The method has the advantages that the measuring device and the measuring process are simple and clear, and data processing is simple and quick.

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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