CN2545661Y - Experimental device of measuring sliding friction force for teaching - Google Patents

Abstract

The utility model discloses an experimental device for measuring the sliding friction force. The device consists of a pulley block that can be moved up and down, a small electric motor, a small block and a spring balance. The organic combination of the pulley block, the small electric motor, the small block and the spring balance minimizes the error of measurement. The utility model can shorten the time of experiment and is easy to be operated.

Description

The teaching experimental provision of measuring the force of sliding friction size

The utility model relates to a kind of device of measuring the force of sliding friction size, particularly a kind of device that can make the measuring result error minimum.

At present, in the junior physics textbook, the experiment of research sliding friction mainly is flatly to haul wood particle uniform motion on a block length plank with spring balance, reads the reading on the spring balance.Though this method simply is easy to do, the each error of experimental result is bigger.Cause the main cause of this phenomenon that 3 points are arranged: the one, use hand spring scale, the pulling force inequality, the wood particle movement velocity is sometimes fast and sometimes slow, can not read the reading of spring balance exactly.The 2nd, to raise easily when pulling spring balance, the direction of power and wooden unit direction of motion have an angle.The 3rd, in the experiment, the student should use hand, observes again, also wants reading, has disperseed notice, is easy to generate accidental error.

The purpose of this utility model is exactly at this situation, and a kind of device of measuring the force of sliding friction size of design.This device can overcome the existing deficiency of measuring in the friction force experiment in use well, can make measuring error drop to bottom line, and experimental period is reduced than original.

The utility model is to realize like this, spring balance 1 is fixed on wood particle 2 centres, link to each other with hook on the spring balance 1 with an end of fine rule 3, the other end is connected in the rotating shaft 6 that small size motor 5 driven by the pulley blocks that can transfer up and down 4, allows small size motor 5 drive wood particles 2 and slides on long plank 7.

Because adopt said structure, this install in use, as long as press the switch of small size motor, just at the uniform velocity advance by small size motor drive wood particle, the experimenter just can be according to the reading of spring balance, and measures the size of force of sliding friction.

Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing:

Fig. 1: the teaching experimental provision of measuring the force of sliding friction size

Among Fig. 1:

1, spring balance 2, wood particle 3, fine rule 4, the pulley blocks that can transfer up and down

5, the rotating shaft 7 on small size motor 6, the small size motor, long plank

This device as long as press the switch of small size motor 5, just by pulley blocks 4 and the fine rule 3 of the rotating shaft on the small size motor 56 by transferring up and down, hauls wood particle 2 and at the uniform velocity advances on long plank 7 in use.At this moment, the experimenter just can read the size of force of sliding friction by spring balance 1.

Claims (1)

1, a kind of teaching with the experimental provision of measuring the force of sliding friction size, this device partly is made up of spring balance, wood particle, fine rule, the pulley blocks that can transfer up and down, small machine, long plank etc., it is characterized in that driving wood particle and spring balance at the uniform velocity slip on long plank by the pulley that can transfer up and down and a small machine.

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