CN201549105U - Visual friction direction demonstrator - Google Patents
Visual friction direction demonstrator Download PDFInfo
- Publication number
- CN201549105U CN201549105U CN2009202695495U CN200920269549U CN201549105U CN 201549105 U CN201549105 U CN 201549105U CN 2009202695495 U CN2009202695495 U CN 2009202695495U CN 200920269549 U CN200920269549 U CN 200920269549U CN 201549105 U CN201549105 U CN 201549105U
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- friction force
- square
- visual
- friction
- demonstration
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Abstract
The utility model relates to a visual friction direction demonstrator, which comprises two square blocks and two hard boards made of highly elastic materials. The visual friction direction demonstrator is characterized in that the two square blocks are respectively fixed onto the two hard boards, and color fringes are printed on the front surface and the back surface of each of the two square blocks. When in friction demonstration, the directions of frictional forces respectively exerted on an upper contact surface and a lower contact surface can be correctly determined according to the inclination directions of the upper elastic square block and the lower elastic square block.
Description
Affiliated technical field
The utility model relates to the device that a kind of demonstration friction exists, especially can ocular demonstration stiction direction and the friction force direction ocular demonstration device of sliding friction force direction.
Background technology
At present, known friction force demonstration device, be to utilize spring balance to haul an object on another object surfaces, to slide, or when the trend of slip is arranged, the demonstration that spring balance is strong, illustrate thus between the surface that two articles is in contact with one another and produced friction force, the friction force that produces when taking place between object to slide relatively is called force of sliding friction, do not take place between object to slide relatively, but the friction force that is produced when the trend of relative slip is arranged is called stiction, and the direction fibrous root of these two kinds of friction force is judged according to the direction of pull of spring balance.But utilize spring balance to come the device of demonstration friction, have following some shortcomings: the direction that 1, can not intuitively show friction force.2, friction force is to occur in pairs, when being the two articles contact, on the surface of contact of an object, produced friction force, equal and opposite in direction, friction force that direction is opposite have then also been produced on the surface of contact of another object simultaneously, this is a very abstract problem, be a difficult point in the teaching, this apparatus for demonstrating more can't show this problem.
Summary of the invention
Existingly draw the apparatus for demonstrating of object can't intuitively show the deficiency of friction force direction in order to overcome with spring balance, this reality is novel to provide a kind of friction force direction ocular demonstration device, this demonstration device can not only intuitively be presented at the friction force that is produced between the surface that two articles is in contact with one another, and can intuitively show the direction of simultaneous equal and opposite in direction on two surfaces that are in contact with one another, two friction force that direction is opposite, said here friction force comprises stiction and force of sliding friction.
The technical scheme that its technical matters that solves the utility model adopts is: square and two hardboards of being made by two blocks of highly elastic materials constitute, and square can be made with rubber, also can make with other highly elastic material.Two squares are separately fixed on two hardboards, and stamp color fringe on former and later two faces of square.When carrying out friction force demonstration, with a square be placed on another square just above, and upper and lower surfaces are fully contacted, following hardboard is fixed on the Demonstration table, and top hardboard draws with an external force F, at this moment will see a phenomenon, that is exactly that inclination has all taken place upper and lower two squares, on color fringe, the vergence direction of two squares is opposite, the first from left right side.The reason that causes two squares to tilt is exactly the friction force between surface of contact, i.e. upper block run-off the straight is that its vergence direction is exactly the direction of friction force f because its lower surface is subjected to the effect of friction force f; The lower block run-off the straight is because the direction that its upper surface is subjected to friction force f " effect, its vergence direction is friction force f just ".Therefore, the utility model just can be intuitively according to the correct direction of determining two friction force f and f ' of the vergence direction of upper and lower two squares in demonstration.
The beneficial effects of the utility model are: during demonstration, according to the vergence direction of upper and lower two squares, can correctly determine the direction of upper and lower two surface of contact suffered friction force f of difference and f '.Simple in structure, the demonstration effect is directly perceived, obvious.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is a structure principle chart of the present utility model.
Fig. 2 is a demonstration design sketch of the present utility model.
The square of making among the figure 1, by highly elastic material, 2, hardboard.
Embodiment
A face of square in Fig. 1 (1) is fixed on above the hardboard (2), stamps color fringe on former and later two faces of square (1).
The utility model most preferred embodiment: the long 60mm of square (1), wide 80mm, high 100mm, the long 160mm of hardboard (2), wide 80mm, high 10mm.
Claims (1)
1. friction force direction ocular demonstration device, square and two hardboards of being made by two blocks of high resiliency materials constitute, and it is characterized in that: two squares are fixed respectively on two hardboards, and stamp color fringe at former and later two faces of two squares.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202695495U CN201549105U (en) | 2009-10-22 | 2009-10-22 | Visual friction direction demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202695495U CN201549105U (en) | 2009-10-22 | 2009-10-22 | Visual friction direction demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201549105U true CN201549105U (en) | 2010-08-11 |
Family
ID=42604283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202695495U Expired - Fee Related CN201549105U (en) | 2009-10-22 | 2009-10-22 | Visual friction direction demonstrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201549105U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466530A (en) * | 2010-11-04 | 2012-05-23 | 兰州大学 | Friction meter |
| CN102663937A (en) * | 2012-05-08 | 2012-09-12 | 上海市闵行第二中学 | Friction direction demonstration system of driving wheels and driven wheels |
-
2009
- 2009-10-22 CN CN2009202695495U patent/CN201549105U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102466530A (en) * | 2010-11-04 | 2012-05-23 | 兰州大学 | Friction meter |
| CN102466530B (en) * | 2010-11-04 | 2014-08-13 | 兰州大学 | Friction meter |
| CN102663937A (en) * | 2012-05-08 | 2012-09-12 | 上海市闵行第二中学 | Friction direction demonstration system of driving wheels and driven wheels |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100811 Termination date: 20101022 |