CN206711461U - A kind of lever principle experiment instrument - Google Patents
A kind of lever principle experiment instrument Download PDFInfo
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- CN206711461U CN206711461U CN201720378946.0U CN201720378946U CN206711461U CN 206711461 U CN206711461 U CN 206711461U CN 201720378946 U CN201720378946 U CN 201720378946U CN 206711461 U CN206711461 U CN 206711461U
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- dynamometer
- cross bar
- base
- control unit
- lever principle
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Abstract
The utility model discloses a kind of lever principle experiment instrument, including base, vertical rod, cross bar, dynamometer and traction control unit, the vertical rod is set on base, the cross bar is rotatablely connected with vertical rod, another side mounting dynamometer of cross bar, the traction control unit pulls dynamometer, and the traction control unit can realize step-less adjustment to the tractive force of dynamometer.The traction control unit is arranged on base, and the wing bolt is connected with whorl of base, and the roller is connected with base rotation, and described pull rope one end is tied up on dynamometer, is tied up to around the other end after roller on wing bolt.Length scale is carved with left and right sides of the cross bar, middle articulated position is zero point.The beneficial effects of the utility model：The experiment teaching aid is designed for the experimental method of control variate method, and by the research method of science, power in lever principle and the factor of the arm of force are analyzed one by one, and experimental considerations is clear, is easy to student's understanding.
Description
Technical field
Originally it is new to belong to teaching experiment teaching aid technical field, and in particular to lever principle experiment instrument.
Background technology
Lever principle is one of principle important in physics, and in physics teaching, demonstration lever principle can allow student's energy
More vivid understanding lever rule.Teacher is demonstrated using experiment teaching aid more when doing lever principle experiment.At present,
It is experiment teaching aid various structures, powerful, still, the research method of science is all not bound with, student thinks when testing
Road is not clear enough, not deep enough to the understanding of principle.
The problem of in physics or biology for multifactor (multivariable), usually using the side of governing factor (variable)
Method, it is multifactor the problem of become multiple single factor tests the problem of, and only change some factor therein, so as to study this because
Element influences on things, is studied respectively, and finally comprehensive again to solve, this method is control variate method.It is in scientific exploration
Important Thought method, be widely used among various Science Explorations and scientific experiment research.
Two variables are shared in lever principle：Power and the arm of force, if using control variate method, first fixed force or the arm of force,
Come the effect for studying the arm of force or when power changes, it can make it that experimental considerations is clear, experiment effect is easier to understand.
The experiment teaching aid of control variate method is not only not bound with the prior art, and can not be applied based on existing teaching aid
Control variate method.For example, 205959481 U of U, CN of Chinese patent CN 205211264, when verifying lever principle, pass through tune
After the quantity and the arm of force of whole left and right counterweight reach balance, now if increasing counterweight quantity by the arm of force of fixed left side counterweight
To study lever principle, it is necessary to by lever leveling, because the weight span of counterweight is larger, generally requires on right side while adjust weight
Code two variables of weight and the arm of force balance to reach.During one-time leveling weighs, left side power size, the right power size and power
Arm is changed, can not be one by one research each variable effect.
Utility model content
The problem of control variate method of science being not bound with for the demonstration in the prior art for lever principle, there is provided
A kind of lever principle experiment instrument, the teaching aid can combine control variate method and two factors of the power in lever principle and the arm of force used
A method for adjusting one is fixed to study its action effect.
A kind of lever principle experiment instrument, including base, vertical rod, cross bar, dynamometer and traction control unit, the vertical rod
Set on base, the cross bar is rotatablely connected with vertical rod, the side mounting counterweight of cross bar one, it is characterised in that the cross bar is another
One side mounting dynamometer, the traction control unit pull dynamometer, traction of the traction control unit to dynamometer
Power can realize step-less adjustment.
The traction control unit is arranged on base, including wing bolt, pull rope and roller, the wing bolt
It is connected with whorl of base, the roller is connected with base rotation, and the groove for accommodating pull rope, the traction are opened up on the roller
Rope one end is tied up on dynamometer, is tied up to around the other end after roller on wing bolt.
Length scale is carved with left and right sides of the cross bar, middle articulated position is zero point.
The beneficial effects of the utility model：The experiment teaching aid designs for the experimental method of control variate method, passes through science
Research method, power in lever principle and the factor of the arm of force are analyzed one by one, experimental considerations is clear, be easy to student understanding.
Brief description of the drawings
The example structure schematic diagram of Fig. 1 the utility model one.
Embodiment
With reference to the accompanying drawing in the utility model embodiment, the technical solution of the utility model is described further.
A kind of lever principle experiment instrument, including base 1, vertical rod 2, cross bar 3, dynamometer 4 and traction control unit 5, institute
Vertical rod 2 to be stated to set on base 1, the cross bar 3 is rotatablely connected with vertical rod 2, the side mounting counterweight 6 of cross bar one, as shown in figure 1,
Another side mounting dynamometer 4 of cross bar 3, the traction control unit 5 pull dynamometer 4, the traction control unit 5
Step-less adjustment can be realized to the tractive force of dynamometer 4.
Using the Examination on experimental operation of control variate method：
First, effect of the power in lever principle is studied by fixed arm of force factor, one is hung in the left side of cross bar 3
Counterweight, regulation traction control unit 5 draw the size of the power of cross bar 3, cross bar 3 is in poised state, now straight down
Record the quality of counterweight 6 and the reading of dynamometer 4；The next group of quality that increase counterweight 6, then pass through traction control unit 5
Carry out leveling cross bar 3, the record now reading of the quality of counterweight 6 and dynamometer 4 can so repeat multigroup, record respectively
The quality of every group of counterweight 6 and the reading of dynamometer 4.
Then, effect of the arm of force in lever principle is studied by fixed force factor, one is hung in the left side of cross bar 3
Counterweight, regulation traction control unit 5 draw the size of the power of cross bar 3, cross bar 3 is in poised state, now straight down
The positional distance and the reading of dynamometer 4 that record counterweight 6 is hung on cross bar 3；Next group, the mass conservation of counterweight 6, move it
The size of the position hung on cross bar 3, the i.e. arm of force, by traction control unit 5 come leveling cross bar 3, record counterweight 6 is in horizontal stroke
The positional distance and the reading of dynamometer 4 hung on bar 3, can so repeat multigroup, record every group of counterweight 6 respectively in horizontal stroke
The positional distance and the reading of dynamometer 4 hung on bar 3.
Because there was only a variable every time, the arm of force of right side dynamometer 4 is constant all the time, can be directly perceived by dynamometer 4
Reading variable change when dynamometer 4 power size variation, contrast that above-mentioned two parts of experimental datas can be perfectly clear finds out
Power and the arm of force are for the action effect in lever principle.Student is doing laboratory, using this teaching aid, with reference to the section of control variate method
Experimental method is learned, the clear thinking entirely tested is deep to the understanding of lever principle.
The traction control unit 5 is arranged on base 1, including wing bolt 51, pull rope 52 and roller 53, described
Wing bolt 51 is threadedly coupled with base 1, and the roller 53 is rotatablely connected with base 1, and receiving traction is opened up on the roller 53
The groove of rope 52, described one end of pull rope 52 ties up on dynamometer 4, tied up to around the other end after roller 53 on wing bolt 51.
Pull rope 52 is around on roller 53, playing a part of changing the direction of power, and 52 1 sections of pull rope is in vertical state, separately
One section is horizontal, and traction force direction of the pull rope 52 to dynamometer 4 straight down, is adjusted by screwing wing bolt 51
The size of tractive force.
Length scale is carved with the cross bar 3, middle articulated position is zero point.When testing, student is facilitated to read
Number, it is not necessary to look for graduated scale to measure again.
Several circular holes 31, the distance of 31 distance transverse rod of circular hole, the 3 middle articulated position and survey are opened up on the cross bar 3
The distance of 3 middle articulated position of the hanging position of power meter 4 and cross bar is in multiple proportion.
Counterweight 6 is by hanging in circular hole 31, in the size of controling power, regulation arm of force experiment, in that context it may be convenient to move
The hanging position of dynamic counterweight 6, because the distance of 31 distance transverse rod of circular hole, 3 middle articulated position and the hanging position of dynamometer 4 and horizontal stroke
The distance of 3 middle articulated position of bar is in multiple proportion, and the record of experimental data is more convenient, and the arm of force is brighter to the action effect of torque
It is aobvious.
It will be appreciated that embodiment of the present utility model while there has been shown and described that, for the common skill of this area
For art personnel, it is possible to understand that these embodiments can be carried out in the case where not departing from principle of the present utility model and spirit
A variety of change, modification, replacement and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.
Claims (3)
1. a kind of lever principle experiment instrument, including base (1), vertical rod (2), cross bar (3), dynamometer (4) and tractive force regulation dress
Put (5), the vertical rod (2) is set on base (1), and the cross bar (3) is rotatablely connected with vertical rod (2), the side mounting of cross bar one
Counterweight (6), it is characterised in that another side mounting dynamometer (4) of cross bar (3), traction control unit (5) drawing are surveyed
Power meter (4), the traction control unit (5) can realize step-less adjustment to the tractive force of dynamometer (4).
2. lever principle experiment instrument as claimed in claim 1, it is characterised in that the traction control unit (5) is arranged at
On base (1), including wing bolt (51), pull rope (52) and roller (53), the wing bolt (51) and base (1) screw thread
Connection, the roller (53) are rotatablely connected with base (1), and the groove for accommodating pull rope (52), institute are opened up on the roller (53)
State pull rope (52) one end to tie up on dynamometer (4), around roller (53), the other end is tied up on wing bolt (51) afterwards.
3. lever principle experiment instrument as claimed in claim 1, it is characterised in that be carved with length at left and right sides of the cross bar (3)
Scale, middle articulated position are zero point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720378946.0U CN206711461U (en) | 2017-04-12 | 2017-04-12 | A kind of lever principle experiment instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720378946.0U CN206711461U (en) | 2017-04-12 | 2017-04-12 | A kind of lever principle experiment instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206711461U true CN206711461U (en) | 2017-12-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720378946.0U Expired - Fee Related CN206711461U (en) | 2017-04-12 | 2017-04-12 | A kind of lever principle experiment instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206711461U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109493698A (en) * | 2018-12-13 | 2019-03-19 | 中国农业大学烟台研究院 | A kind of physics teaching water flow measurement system |
| CN109959604A (en) * | 2019-02-22 | 2019-07-02 | 重庆建工建材物流有限公司 | Haydite concrete delamination degree test device and method |
-
2017
- 2017-04-12 CN CN201720378946.0U patent/CN206711461U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109493698A (en) * | 2018-12-13 | 2019-03-19 | 中国农业大学烟台研究院 | A kind of physics teaching water flow measurement system |
| CN109493698B (en) * | 2018-12-13 | 2021-05-28 | 中国农业大学烟台研究院 | Water flow measuring system for physics teaching |
| CN109959604A (en) * | 2019-02-22 | 2019-07-02 | 重庆建工建材物流有限公司 | Haydite concrete delamination degree test device and method |
| CN109959604B (en) * | 2019-02-22 | 2024-05-31 | 重庆建工建材物流有限公司 | Device and method for testing layering degree of ceramsite concrete |
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171205 Termination date: 20180412 |
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| CF01 | Termination of patent right due to non-payment of annual fee |