CN205541570U - Inertia and theorem of angular momentum's presentation device - Google Patents
Inertia and theorem of angular momentum's presentation device Download PDFInfo
- Publication number
- CN205541570U CN205541570U CN201521077543.XU CN201521077543U CN205541570U CN 205541570 U CN205541570 U CN 205541570U CN 201521077543 U CN201521077543 U CN 201521077543U CN 205541570 U CN205541570 U CN 205541570U
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- support
- central shaft
- angular momentum
- demonstrating
- rotary body
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Abstract
The utility model provides an inertia and theorem of angular momentum's presentation device, includes the support, set up in center pin on the support, the center pin with the support combination is a shape, set up in epaxial at least one rotator in center, the rotator can wind the axis of center pin is rotatory, the coiling in haulage rope on the rotator, set up in the weight of haulage rope free end, vertically set up on the support and lie in the scale of center pin one side, set up in pickup assembly on the support, pickup assembly includes two pairs of photoemission wares and photoelectric receiver, wherein, about two photoemission wares the interval set up in on the support of center pin one side, about two photoelectric receiver the interval set up in on the support of center pin opposite side, the photoemission ware with photoelectric receiver's position corresponds, display with the pickup assembly electricity is connected is provided with the timing module in. The utility model discloses simple structure, it is portable, the class demonstration of being convenient for.
Description
Technical field
This utility model belongs to teaching and experiment equipment technical field, particularly relates to a kind of for demonstrating rotary inertia
And the experimental apparatus of angular momentum theorem.
Background technology
" rotary inertia " is the Key Concepts in College physics course dynamics of rigid bodies part, due to this concept
Relatively abstract student often also exists the difficulty in understanding, if class demonstration can be carried out will assist in student
Study.
In existing experimental facilities, the measurement of rotary inertia often uses Inertia Based on Torsion Pendulum Method, the method experiment condition
It is harsh, it is desirable to deflection angle is the least, suspension wire length is equal, tension force phase etc. condition, has display inconspicuous,
The shortcomings such as device complexity is difficult to demonstrate in classroom, and instrument cost is high.The most common rotary inertia demonstration
Device is to use two quality and cylinders equivalently-sized, that Mass Distribution is different, by the two from an inclined-plane
Sustained height discharge simultaneously, by the two order difference rolled down discuss thing influential on rotary inertia
Reason amount, this experiment also exists can only not have quantitative expression, and rigid body round fixed axis of the most strictly coincideing by qualitative observation
The shortcomings such as the physical model rotated.
Summary of the invention
For above not enough, the purpose of this utility model is to provide that one demonstrates gross mass intuitively, quality is divided
The physical quantitys such as the cloth device on the impact of rotary inertia.
To achieve these goals, this utility model takes following technical solution:
A kind of rotary inertia and the apparatus for demonstrating of angular momentum theorem, including: support；It is arranged on described support
Central shaft, described central shaft is in shaped door with described holder combination；It is arranged at least on described central shaft
Individual rotary body, described rotary body can rotate around the axis of described central shaft；It is wound in leading on described rotary body
Messenger；It is arranged at the counterweight of described pull rope free end；It is vertically arranged on support and is positioned at described central shaft
The scale of side；Being arranged at the sensor cluster on described support, described sensor cluster includes two pairs of photoelectricity
Emitter and photelectric receiver, wherein, two photoemitters are arranged at intervals at described central shaft side up and down
Support on, two photelectric receivers are arranged at intervals on the support of described central shaft opposite side up and down, described
Photoemitter is corresponding with the position of described photelectric receiver；The display electrically connected with described sensor cluster
Device, is provided with timing module in described display.On the basis of technique scheme, described rotary body
Being machined with groove on periphery, described pull rope is wound in groove.
On the basis of technique scheme, described pull rope is wound in described rotary body end.
On the basis of technique scheme, spaced apart for mark between described upper and lower two photoemitters
The length of chi.
On the basis of technique scheme, described a rotating body is provided with angular-rate sensor, described angle speed
Degree sensor electrically connects with described display.
From above technical scheme, apparatus for demonstrating of the present utility model can realize drilling of kinds of experiments phenomenon
Showing, observation on influencing factors, the measurement of rotary inertia, angular momentum theorem and angular momentum including rotary inertia are kept
Permanent demonstration；The introducing of timing module, it is to avoid the subjectivity observed, for calculating and follow-up theory is established
Basis the most accurately；This apparatus for demonstrating also has measurement function simultaneously, it is possible to achieve the quantitative survey of time
Amount, it is to avoid subjective error, it is also possible to for the solving of rotary inertia, angular momentum quantitatively and the conservation of angular momentum
Numerical Validation provides and calculates data；It is applicable not only to the study of regular shape rigid body, it is also possible to be used for measuring non-
The regular shape rigid body rotary inertia to dead axle, solves existing solid moment of inertia and angular momentum demonstration instrument
Structure complexity, complex operation, problem that cost is high, have simple in construction, portable, and experimentation is directly perceived,
It is easy to the feature of class demonstration.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to enforcement
Example or description of the prior art need the accompanying drawing used do simple introduction, it should be apparent that, in describing below
Accompanying drawing is only some embodiments of the present invention, for those of ordinary skill in the art, is not paying wound
On the premise of the property made work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of this utility model embodiment 1；
Fig. 2 is the structural representation of this utility model embodiment 2.
Detailed description of the invention
Below in conjunction with the accompanying drawings this utility model is described in detail, when describing this utility model embodiment in detail,
For purposes of illustration only, represent that the accompanying drawing of device architecture can be disobeyed general ratio and be done partial enlargement, and described signal
Figure simply example, it should not limit the scope of this utility model protection at this.It should be noted that accompanying drawing is equal
Use the form simplified very much and all use non-ratio accurately, only in order to conveniently, clearly to aid in illustrating originally
The purpose of utility model embodiment.
Embodiment 1
As it is shown in figure 1, apparatus for demonstrating of the present utility model includes support 1, central shaft 2, rotary body 3, leads
Messenger 4, counterweight 5, scale 6, sensor cluster 7 and display 8.Sensor cluster 7 includes that photoelectricity is sent out
Emitter 7-2 and photelectric receiver 7-1, be provided with two pairs of photoemitters and opto-electronic receiver altogether in the present embodiment
Device, sensor cluster 7 electrically connects with display 8, has timing module, sensor cluster in display 8
Triggering timing module can start or stop timing, and show on the display 8.
Central shaft 2 is arranged on support 1, and central shaft 2 and support 1 combine in shaped door.Rotary body 3 is arranged
On central shaft 2, and can rotate about the axis on central shaft 2, the present embodiment is provided with on central shaft 2
Two profiles and rotary bodies identical in quality, that Mass Distribution is different.The periphery of rotary body 3 is machined with
Groove (not shown), is wound in pull rope 4 in groove, and the free end of pull rope 4 connects counterweight 5.
The support 1 of certain side of central shaft 2 is provided with the scale 6 of vertically placement.
Sensor cluster 7 is arranged on the support 1 of central shaft 2 both sides, the most spaced apart two photoelectricity
Receptor 7-1 is positioned on the support 1 of the same side, and the most spaced apart two photoemitter 7-2 are positioned at
On the support 1 of opposite side, the position of photoemitter 7-2 is corresponding with the position of photelectric receiver 7-1,
Length equal to scale 6 spaced apart between two photoemitters, thus, the warp when counterweight 5 falls
Cross first to photoelectric sensor time, this photoelectric sensor detects counterweight, starts the timing module in display
Start timing, when counterweight 5 falls through second pair of photoelectric sensor, and this photoelectric sensor detects counterweight
After, make timing module stop timing, the most recordable time obtained used by weight fell, and over the display
Show.
Presentation process to this apparatus for demonstrating is described in detail as follows below:
Counterweight 5 is connected with pull rope 4, pull rope 4 is wound in the groove of rotary body 3, now counterweight
5 tops being positioned at a pair photoelectric sensor being arranged on；
Applying identical initial velocity to two rotary bodies 3 by release counterweight 5, counterweight 5 is in dropping process
Body 3 is rotated rotate；
When counterweight 5 is by a pair photoelectric sensor on being arranged on, the timing module in display 8 starts
Timing, and simultaneous display time；
When counterweight 5 is successively dropped through a pair photoelectric sensor being arranged under, timing module stopping and
Time, and demonstrate that two counterweights are through the time used by the difference of distance shown in scale 6.
By changing rotary body, this apparatus for demonstrating can demonstrate out that shape is identical with Mass Distribution, gross mass not
With the situation of speed that rotates in identical moment following rotator of rotary body, or shape and identical in quality, matter
Amount is distributed the situation of the speed that different rotary bodies rotates in identical moment following rotator.By the weight of counterweight
And the radius of rotary body can be calculated moment, the time measured by timing module can computing further
Obtain the momentum of moment and the angular momentum of rotary body, further, also can be calculated last current state rotary body
Angular velocity, and then obtain the rotary inertia of rotary body.
Embodiment 2
As in figure 2 it is shown, the present embodiment place different from embodiment 1 is: rotary body 3 is for irregular
Rigid body, is additionally provided with angular-rate sensor inside rotary body, is provided with connecing of angular-rate sensor in display 8
Receiving device, when rotary body 3 rotates, display 8 can also receive the speed that angular-rate sensor measurement is arrived
Degree, and show.
In this device, the corresponding different angular velocity of rotation of different laboratory samples, can be surveyed by sensor
Directly by the measurement result of related physical process, such as rotation time and angular velocity etc. after amount, show in display
On screen, it is simple to observation of students.
Above example is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to upper
Stating embodiment to be described in detail this utility model, those of ordinary skill in the field should manage
Solve, still detailed description of the invention of the present utility model can be modified or equivalent, and without departing from
Any amendment of this utility model spirit and scope or equivalent, it all should be contained of the present utility model
Among right.Such as, the weight of the structure of rotary body, the quantity of setting, counterweight etc. all can root
Test needs factually to be changed；Pull rope can be wound on rotary body periphery, it is also possible to is wound in rotation
On the cylinder of body end；Such as these change and equivalent transformation should be included in the model described in claim
Within enclosing.
Claims (5)
1. a rotary inertia and the apparatus for demonstrating of angular momentum theorem, it is characterised in that including:
Support；
Being arranged at the central shaft on described support, described central shaft is in shaped door with described holder combination；
At least one rotary body being arranged on described central shaft, described rotary body can be around the axle of described central shaft
Line rotates；
It is wound in the pull rope on described rotary body；
It is arranged at the counterweight of described pull rope free end；
It is vertically arranged on support and is positioned at the scale of described central shaft side；
Be arranged at the sensor cluster on described support, described sensor cluster include two pairs of photoemitters and
Photelectric receiver, wherein, two photoemitters are arranged at intervals at the support of described central shaft side up and down
On, two photelectric receivers are arranged at intervals on the support of described central shaft opposite side up and down, and described photoelectricity is sent out
Emitter is corresponding with the position of described photelectric receiver；
The display electrically connected with described sensor cluster, is provided with timing module in described display.
2. rotary inertia as claimed in claim 1 and the apparatus for demonstrating of angular momentum theorem, its feature exists
In: being machined with groove on the periphery of described rotary body, described pull rope is wound in groove.
3. rotary inertia as claimed in claim 1 and the apparatus for demonstrating of angular momentum theorem, its feature exists
In: described pull rope is wound in described rotary body end.
4. rotary inertia as claimed in claim 1 and the apparatus for demonstrating of angular momentum theorem, its feature exists
In: the length for scale spaced apart between described upper and lower two photoemitters.
5. rotary inertia as claimed in claim 1 and the apparatus for demonstrating of angular momentum theorem, its feature exists
In: described a rotating body is provided with angular-rate sensor, and described angular-rate sensor is electrically connected with described display
Connect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521077543.XU CN205541570U (en) | 2015-12-22 | 2015-12-22 | Inertia and theorem of angular momentum's presentation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521077543.XU CN205541570U (en) | 2015-12-22 | 2015-12-22 | Inertia and theorem of angular momentum's presentation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205541570U true CN205541570U (en) | 2016-08-31 |
Family
ID=56762864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201521077543.XU Expired - Fee Related CN205541570U (en) | 2015-12-22 | 2015-12-22 | Inertia and theorem of angular momentum's presentation device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205541570U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106781897A (en) * | 2017-01-16 | 2017-05-31 | 安徽师范大学 | Homing position type free fall experimental device |
| CN108074448A (en) * | 2018-01-16 | 2018-05-25 | 浙江大学城市学院 | A kind of novel quantitative verifies law of conservation of moment of momentum experiment instrument |
-
2015
- 2015-12-22 CN CN201521077543.XU patent/CN205541570U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106781897A (en) * | 2017-01-16 | 2017-05-31 | 安徽师范大学 | Homing position type free fall experimental device |
| CN108074448A (en) * | 2018-01-16 | 2018-05-25 | 浙江大学城市学院 | A kind of novel quantitative verifies law of conservation of moment of momentum experiment instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160831 Termination date: 20161222 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |