Gravitational acceleration tester

Abstract

The invention discloses a gravity acceleration tester, which includes a rectangular magnet, an insulating connector, a constant DC power supply and a double-pole double-throw switch. The insulating connector includes two symmetrically arranged liquid channels, and the liquid channels are at the bottom of the insulating connector. Connected, the liquid channel is arranged in the vertical direction, electrodes are arranged on both sides of the bottom of the insulating connector, and the rectangular magnet is arranged on the lower part of the insulating connector; a liquid resistance is arranged in the liquid channel; by adjusting the constant DC power supply, changing the current size or By changing the number of magnets and changing the magnetic induction intensity to change the height difference of the liquid level at both ends of the connector, the height difference reflects the gravity difference, and the local gravity acceleration of the experiment can be obtained by calculation. The double-pole double-throw switch can switch the pole of the pure copper sheet electrode Reverse copper plating, so that the liquid level changes from left high and right low to left low and right high or from left low and right high to left high and right low, using current symmetrical measurement method to eliminate pyroelectric and thermomagnetic side effects, the measurement results more acurrate.

Description

technical field [0001] The invention belongs to the field of physics teaching experiment devices, and in particular relates to a gravity acceleration tester. Background technique [0002] Gravitational acceleration is a very important physical quantity in physics. It refers to the acceleration of an object under the action of gravity. Also called the acceleration of free fall, expressed in g, the direction is vertically downward. Due to the influence of the earth's rotation, the acceleration of gravity is slightly different at the same latitude and at different altitudes; the acceleration of gravity at the same altitude and at different latitudes is not exactly the same. Therefore, the determination of the acceleration of gravity is of great significance to theory, production and scientific research. [0003] At present, the commonly used methods for measuring the acceleration of gravity in high school physics experiments include the simple pendulum method, the dot timer m...

AI Technical Summary

Problems solved by technology

The period of a simple pendulum is According to the long period of the pendulum Available However, two problems inevitably arise in the simple pendulum experiment: in the measurement of the pendulum length, it is difficult to obtain an accurate value of the pendulum length due to the difficulty in determining the center of mass of the pendulum ball; , there will be a situation of leading or lagging timing, and there will be a large timing error

Both the dot timer and the chute method use the displacement and time of the falling object to be measured, and the law of uniform linear motion can be used to obtain the acceleration of gravity, but friction and air resistance will bring errors to the measurement results and the operation is complicated. Data processing is complicated

[0004] In recent years, based on the existing research programs and results, combined with the DIS system, a method for measuring the acceleration of gravity has been proposed. Now there are experimental instruments produced by an instrument company on the market for this experiment, but the friction force still has a great influence. And it is not suitable for high school students to do it by themselves, because the experiment process is too dependent on electronic devices such as sensors and computers. They are like a black box, and students can complete the experiment even if they do not understand the principle of the whole experiment. This is not conducive to students exploring the nature of high school physics experiments, and using the average speed of the light baffle instead of the instantaneous speed will also affect the measurement results

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