CN2911837Y - Friction force demonstrator - Google Patents
Friction force demonstrator Download PDFInfo
- Publication number
- CN2911837Y CN2911837Y CN 200620084904 CN200620084904U CN2911837Y CN 2911837 Y CN2911837 Y CN 2911837Y CN 200620084904 CN200620084904 CN 200620084904 CN 200620084904 U CN200620084904 U CN 200620084904U CN 2911837 Y CN2911837 Y CN 2911837Y
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- CN
- China
- Prior art keywords
- spring
- friction force
- wooden case
- travelling belt
- conveyer belt
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model relates to an educational tool, in particular to a friction force demonstrator for physics education. The technical proposal lies in that the utility model comprises a wooden case, a supporting plate in the case, a measuring scale, a conveyer belt, a small object cart, and a spring; wherein a fan-shaped board provided with the measuring scale is vertically fixed in the horizontally positioned wooden case; the conveyer belt provided with a supporting plate on the bottom is positioned in the front of the bottom of the board; one end of the conveyer belt is moved by a shaft of a pulley driven by a motor; the small object cart is positioned on the upper surface of the conveyer belt and connected with the movable end of the spring, which is fixed and connected with one end of the wooden case, and the endpoint of an indicator. The utility model has the advantages that by making use of the lever principle, the indicator is able to amplify the reading of the spring scale, increases the visibility and improves the effect of demonstration with less errors owing to the adoption of a copper sleeve.
Description
One, technical field:
The utility model relates to a kind of educational aid, particularly relates to the friction force demonstration device on a kind of physics teaching.
Two, background technology:
Friction force knowledge be just, one of the important content of high school physics mechanics part, in order to prove absolutely this problem, in study, usually test and verify and illustrate this problem by friction force.Teaching aid used in imparting knowledge to students now is simpler, and just the sliding shoe of different coefficients of friction calculates friction force and friction factor by the traction sliding shoe, can not bring results of learning intuitively to the student.
Three, summary of the invention:
The purpose of this utility model is exactly the above-mentioned defective that exists at prior art, but a kind of friction force demonstration device of demonstration friction intuitively is provided.
Its technical scheme is: be made up of the support plate in wooden case, the wooden case, rule, travelling belt, object dolly and spring; Wherein, the fan-shaped plank that has rule is vertically fixed in the wooden case of horizontal positioned, before the bottom of plank, be sidelong a travelling belt, a support plate is fixed in the travelling belt bottom, one end of travelling belt is rotated by the rotating shaft of driven by motor pulley, the object dolly places the upper surface of travelling belt, and the object dolly links to each other with the pointer end points with the movable end of spring, and spring is fixedly connected on an end of wooden case.
Spring is connected on the fixing wooden unit of wooden case one end.
Described motor drives the pulley rotating shaft by belt and rotates.
Pointer is a lever amplifier, and enlargement factor is near seven.
The beneficial effects of the utility model are: a, pointer skilful use lever principle, amplify the spring balance reading, and increase visibility, improve the demonstration effect, and adopted copper sheathing, reduced error; B, driven by motor travelling belt move object on travelling belt, hardboard is gone up in holder under the travelling belt, make the object of which movement velocity-stabilization, and can change rotating speed by changing voltage, verify that more easily friction force size and relative motion of object speed are irrelevant; C, utilize the standard spring balance of two obstructed ranges two the standard grooves that drawn dexterously, make device can study sliding friction and rolling friction that the slight small item body is subjected to simultaneously; D, for reduce the friction, in two rotating shafts, bearing has been installed all, in rotating shaft, also smear copper oil, reduce the friction.The mass part of whole device is all relevant with friction, provides convenience to teaching; E, bottom of device are loaded onto two little drawers, and some accessories are placed on the inside, make things convenient for the use of device; The plank drawing and pulling type is adopted in switching on f, the wooden unit between different clothes, the size of convenient research friction force and the relation of material.
Four, description of drawings:
Accompanying drawing 1 is a structural representation of the present utility model.
Five, embodiment:
In conjunction with the accompanying drawings, the utility model will be further described:
Its technical scheme is: be made up of the support plate in wooden case 10, the wooden case 4, rule 1, travelling belt 6, object dolly 5 and spring; Wherein, the fan-shaped plank that has rule 1 is vertically fixed in the wooden case 10 of horizontal positioned, before the bottom of plank, be sidelong a travelling belt 6, a support plate 4 is fixed in the travelling belt bottom, one end of travelling belt drives pulley rotating shaft 7 by motor 9 and rotates, and object dolly 5 places the upper surface of travelling belt, and object dolly 5 links to each other with pointer 2 end points with the movable end of spring 3, the fixedly connected wooden unit 11 of wooden case 10 1 ends, spring 3 is connected on the wooden unit 11.Described motor 9 drives pulley rotating shaft 7 by belt 8 and rotates.Pointer 2 is lever amplifiers, and enlargement factor is near seven.For guaranteeing the stationarity of moving of car, fix a support plate 4 in the travelling belt bottom, in the process of moving of car, to remain the three point-blank, and guarantee that spring does not rub with travelling belt.Pointer is a lever amplifier, and enlargement factor is near 7, and pointer phase countershaft can slide up and down slightly, to guarantee that in the pointer rotating process line of object, pointer end points, spring all the time point-blank.Accessory is one in the little wooden car that has towel, cloth, each one of towel, cloth, and the counterweight that differs in size is several, one of student's power supply, one of wood particle, one of jigger, one on brush becomes mildewed.
The scale principle is: at first adjust spring movable end and pointer end points and object point-blank, determined that pointer is after zero point, with standard spring balance pulling spring end, in the pointer rotation process, mark 0 N-2.5 Ns and 0 N of-0.25 N of two groove respectively as master scale, on travelling belt, in the pulling object, can directly read the suffered friction force size of object then.
The experimental implementation step
(1) demonstrates the force of sliding friction that little wooden car is subjected to
A, by changing the size of surface of contact, the size of checking friction force has nothing to do with the contact area size.
B, by changing voltage, change the travelling belt rotating speed, thereby change relative motion of object speed, checking friction force size is irrelevant with relative motion of object speed.
C, put the counterweight of equal in quality on little wooden car, by the suffered friction force size of Measuring Object, checking friction force size is directly proportional with normal pressure.
D, switch different clothes measure friction force on little wooden car, checking friction force size is relevant with the surface of contact material character.
(2) put the brush that becomes mildewed, judge the direction of friction force by the sensing of brush
(3) change jigger, measure the rolling friction that it is subjected to, the quality of it and little wooden car relatively verifies that rolling friction is less than sliding friction again.
(4) demonstration stiction.
Application notice
(1) preoperation inspection pointer zero set whether then slightly changes the pointer angle if any deviation pointer is transferred to zero-bit.
(2) regulate spring movable end, pointer end points and object point-blank before the use.Regulate the small belt pulley on the pulley and the direction of the small wheels on the motor, make it point-blank.
When (3) beginning to measure, because the place of place's linear slit is arranged on the travelling belt, be not very flat, make object through out-of-date, pointer rocks, so pointers such as reading Shi Ying are read when relatively stable again.
Claims (4)
1, a kind of friction force demonstration device is characterized in that: be made up of support plate (4), rule (1), travelling belt (6), object dolly (5) and spring in wooden case (10), the wooden case; Wherein, the fan-shaped plank that has rule (1) is vertically fixed in the wooden case (10) of horizontal positioned, before the bottom of plank, be sidelong a travelling belt (6), a support plate (4) is fixed in the travelling belt bottom, one end of travelling belt drives pulley rotating shaft (7) by motor (9) and rotates, object dolly (5) places the upper surface of travelling belt, and object dolly (5) links to each other with pointer (2) end points with the movable end of spring (3), and spring (3) is fixedly connected on an end of wooden case (10).
2, friction force demonstration device according to claim 1 is characterized in that: spring (3) is connected on the fixing wooden unit (11) of wooden case (10) one ends.
3, friction force demonstration device according to claim 1 is characterized in that: described motor (9) drives pulley rotating shaft (7) by belt (8) and rotates.
4, according to claim 1,2 or 3 described friction force demonstration devices, it is characterized in that: pointer (2) is a lever amplifier, and enlargement factor is near seven.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620084904 CN2911837Y (en) | 2006-05-26 | 2006-05-26 | Friction force demonstrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620084904 CN2911837Y (en) | 2006-05-26 | 2006-05-26 | Friction force demonstrator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2911837Y true CN2911837Y (en) | 2007-06-13 |
Family
ID=38133699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620084904 Expired - Fee Related CN2911837Y (en) | 2006-05-26 | 2006-05-26 | Friction force demonstrator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2911837Y (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236707B (en) * | 2008-03-10 | 2010-06-02 | 南京化工职业技术学院 | Active and static friction force demonstration instrument for plane and inclined slope |
| CN102208148A (en) * | 2011-05-23 | 2011-10-05 | 韩进荣 | Novel physical experiment demonstration device |
| 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 |
| CN105139725A (en) * | 2015-09-25 | 2015-12-09 | 中国石油大学(北京) | Static friction force tester |
| CN108417126A (en) * | 2018-04-25 | 2018-08-17 | 王佳愉 | A kind of friction force demonstration instrument |
-
2006
- 2006-05-26 CN CN 200620084904 patent/CN2911837Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101236707B (en) * | 2008-03-10 | 2010-06-02 | 南京化工职业技术学院 | Active and static friction force demonstration instrument for plane and inclined slope |
| 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 |
| CN102208148A (en) * | 2011-05-23 | 2011-10-05 | 韩进荣 | Novel physical experiment demonstration device |
| 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 |
| CN105139725A (en) * | 2015-09-25 | 2015-12-09 | 中国石油大学(北京) | Static friction force tester |
| CN108417126A (en) * | 2018-04-25 | 2018-08-17 | 王佳愉 | A kind of friction force demonstration instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |