A centripetal force demonstrator

Abstract

The invention relates to the field of a physical experiment teaching aid, and particularly to a centripetal force demonstrator. The centripetal force demonstrator comprises a frame, a rotating shaft, a cantilever, a transmission device, a speed change device, a variable-diameter device, a dynamometer and steel balls. The rotating shaft is vertically mounted at the left side of the frame. The upper part of the rotating shaft is provided with a blind hole. The bottom of the blind hole is provided with a communicated step hole on which an internal screw thread is arranged. The cantilever is next to the upper surface of the frame and is vertically mounted on the rotating shaft. The transmission device which drives the rotating shaft to rotate is arranged below the frame. The variable-diameter device is arranged below the transmission device. The dynamometer is mounted at the end of the cantilever. The steel balls are arranged in the cantilever. The centripetal force demonstrator can perform quantitative researching on a relationship among mass, rotation radius, rotating speed and the centripetal force. Furthermore the centripetal force demonstrator can change the mass, the rotation radius and the rotating speed without rotation stoppage. Furthermore the centripetal force demonstrator has advantages of improving experiment precision, reducing experiment error and shortening experiment time.

Description

technical field [0001] The invention relates to the field of teaching aids for physics experiments, in particular to a centripetal force demonstrator. Background technique [0002] It is known that "centripetal force" is a very important knowledge point in high school physics textbooks. In teaching practice, the research on centripetal force, especially the derivation of the formula, is a difficult point in teaching. The theoretical derivation process of the formula is too abstract and difficult for students to understand, and the experimental research carried out basically uses conical pendulum or similar devices. A rough verification of centripetal force lacks scientificity, accuracy and comparability, and the actual effect is not ideal; and the "centripetal force experiment demonstrator" used in textbooks over the years is only semi-quantitative. [0003] In the prior art, a Chinese patent with an application date of 2013.01.29 and an application number of 201320047446.0...

AI Technical Summary

Problems solved by technology

[0009] 1. The centripetal force can only be studied qualitatively, not quantitatively;

[0010] 2. Driven by a motor, although it can achieve variable speed, it cannot work when the power is off, and the scope of use is limited;

[0011] 3. It is not possible to measure all the data at one time during the test, and it is necessary to stop and replace the test conditions, such as quality;

[0012] 4. For the manually rotating device, the speed is easily disturbed, resulting in large experimental errors

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