Friction demonstration mechanism

Abstract

The invention relates to a friction demonstration mechanism in the field of teaching instruments. A friction test bench comprises a left working part, a right working part and an intermediate workingpart between the left working part and the right working part. The left working part and the right working part are directly fixed to a support frame. The front end and the rear end of the intermediate working part are provided with a front rotating roller and a rear rotating roller respectively. A friction working surface is arranged in a surrounding manner between the front rotating roller and the rear rotating roller. The front rotating roller or the rear rotating roller is provided with a rotating device. The friction working surface comprises groups of branch working surfaces which are successively spliced end to end. The friction working surface is provided with a friction block. The front end of the support frame is provided with a driving work part corresponding to the friction block. A dynamometer is arranged between the driving work part and the friction block. The friction demonstration mechanism can simulate the friction under different roughness environments simultaneously, facilitates operations and practices for students, improves the cognition degree of the students, and improves teaching quality.

Description

technical field [0001] The invention relates to a friction demonstration mechanism in the field of teaching instruments. Background technique [0002] In middle school physics teaching, sliding friction is the focus and difficulty of teaching, and the best way to break through this difficulty is to let students know which factors are related to the size of sliding friction through experiments; the current experimental method is mainly to use The spring dynamometer pulls the small wooden block horizontally on a long plank to move at a constant speed, and uses the condition of the balance of the two forces to obtain the magnitude of the sliding friction force through the indication of the spring dynamometer; in the prior art, due to the limited environment , often only one kind of roughness friction test can be done, and the friction test of different roughness is more troublesome to operate; in the prior art, the application number is 201310463802.1, the application date is 2...

AI Technical Summary

Problems solved by technology

[0002] In middle school physics teaching, sliding friction is the focus and difficulty of teaching, and the best way to break through this difficulty is to let students know which factors are related to the size of sliding friction through experiments; the current experimental method is mainly to use The spring dynamometer pulls the small wooden block horizontally on a long plank to move at a constant speed, and uses the condition of the balance of the two forces to obtain the magnitude of the sliding friction force through the indication of the spring dynamometer; in the prior art, due to the limited environment , often only one kind of roughness friction test can be done, and it is troublesome to perform friction tests with different roughnesses; in the prior art, application number 201310463802.1, application date 2013.10.08, application publication number CN 103473973 A, a sliding friction demonstration device on the publication date of the application on 2013.12.25, its structure includes a spring dynamometer, a fixed pulley, a slider, a long wooden block, a weight, an electric motor, a thin wire, a reading board, a vertical board and a power supply , which is characterized in that: the spring dynamometer is vertically fixed on the reading plate, and a fixed pulley is arranged directly below it, and one end of the fixed pulley is connected with the spring dynamometer through a thin wire, and the other end is connected with the slider, and the slider is placed horizontally On the long wooden block, the other end of the long wooden block is connected to the motor through a thin wire, and the long wooden block moves horizontally and uniformly in a straight line driven by the motor; this invention cannot quickly replace the rough surface, and can only be used on a single rough surface To experiment; not very efficient to use

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