Electric spark hodoscope for simple pendulum vibration curve

Abstract

This invention discloses a simple pandulum vibration graph spark hodoscope including a vibrating ball, a wire a time axis hodoscopie needle, conduction paper, a high voltage generator, a motor, double-pole three-throw switch, an electromagnet and indicating lump, among which, the ball and the hodoscope pole are connected to the positive of the high voltage generator negative to the conducting paper and input of which is linked with the motor and the said switch, the other end of the switch on the transformer connecting to a bridge commutating circuit linked to a filter capacitor which is connected to the magnet to absorb the ball after switch on.

Description

technical field [0001] The invention relates to a single pendulum vibration graph line demonstrator, in particular to a single pendulum vibration graph line electric spark tracer using electric sparks. Background technique [0002] Now in the middle school physics class, when teaching the vibration graph of a single pendulum to do demonstration experiments, the general method is: the teacher fixes the sand pendulum ball with one hand and blocks the sand flow hole with his fingers, and pours the fine sand in the small bottle into the sand pendulum with the other hand . After filling, put down the vial and turn on the switch again, release the pendulum ball and make a rectangular iron plate move forward at a constant speed, at the same time release the fingers blocked on the quicksand hole, so that the sand pendulum can move freely according to the movement law of a simple pendulum. At this time, the flowing fine sand can draw a sinusoidal curve on the rectangular iron plate....

AI Technical Summary

Problems solved by technology

But the above-mentioned instrument has the following problems: First, the opening of the switch and the release of the quicksand hole by the finger are not synchronized and cause the pendulum to vibrate at the initial stage of release, destroying the vibration of the single pendulum.

Second, if the sand is too fine, the pendulum ball will leak before it completes a full vibration. If the sand is too coarse or some individual sand particles are larger, it will cause the flow of quicksand to stop and the experiment will be interrupted.

In addition, in principle, the pendulum length of the sand pendulum is fixed on the surface, but in fact, due to the continuous loss of sand, the center of gravity of the pendulum ball changes, so it can be said that the pendulum length is constantly changing. From a theoretical point of view, this experiments are imprecise

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