CN208673577U - A kind of conservation of angular momentum experiment instrument - Google Patents
A kind of conservation of angular momentum experiment instrument Download PDFInfo
- Publication number
- CN208673577U CN208673577U CN201820438211.7U CN201820438211U CN208673577U CN 208673577 U CN208673577 U CN 208673577U CN 201820438211 U CN201820438211 U CN 201820438211U CN 208673577 U CN208673577 U CN 208673577U
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- support arm
- conservation
- angular momentum
- fixed
- motor
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Abstract
The conservation of angular momentum experiment instrument of the utility model, including pedestal, turntable and motor are fixed with vertical cylinder on pedestal, are respectively fixed with axis and lower axle in turntable upper and lower surface；Be characterized in that: lower axle warp beam, which is held, to be rotatably dispose in cylinder, and the two sides on upper axis top are respectively and fixedly provided with U-shaped seat, and left support arm and right support arm have been respectively articulated in two U-shaped seats, and the outer end of left and right support arm is respectively and fixedly provided with dumbbell；Motor is fixed on the top of axis, and lower roll and upper roll are fixed on the output shaft of motor, and lower roll, upper roll are connected through drawstring with the outer end of left support arm and right support arm respectively.The conservation of angular momentum experiment instrument of the utility model has both cultivated the dense experimental interests of students so that the conservation of angular momentum visually is presented out, it helps for student to the profound understanding of the principles of science, beneficial effect is significant.
Description
Technical field
The utility model relates to a kind of conservation of angular momentum experiment instruments, more specifically, more particularly to a kind of by changing object
The radius of turn of body is come the conservation of angular momentum experiment instrument observed.
Background technique
Physical Experiment should also have lively, interesting form to show under the premise of teaching student's scientific theory, with
Just student generates keen interest to experiment, and then student is excited to think deeply empirical theory, so as to by scientific theory application
To in the middle of production practices later.The conservation of angular momentum theory one of more classical as object of which movement, is meant that not
When being acted on by moment of face, the total angular momentum of system is inconvenient.The expression formula of angular momentum are as follows: L=r × p=r × (mv)=mr2ω, m are
The quality of object, p are the momentum of object, and r is the mass center of object to the distance of shaft, and ω is the rotational angular velocity of object.Lead to
Experiment is crossed to observe the conservation of angular momentum, the quality of object can not change under normal conditions, this is just needed to mass center to shaft
Distance r, object rotational angular velocity ω just change, by changing one of amount, to observe the variation of another amount, with
It withdraws deposit the conservation of angular momentum.
Summary of the invention
The utility model in order to overcome the shortcomings of the above technical problems, provides a kind of conservation of angular momentum experiment instrument.
The center of the conservation of angular momentum experiment instrument of the utility model, including pedestal, turntable and motor, base upper surface is fixed
There is a vertical cylinder, is respectively fixed with axis and lower axle on the center of disk upper surface and lower surface；It is characterized by: under described
Axis warp beam, which is held, to be rotatably dispose in cylinder, and the two sides on upper axis top are respectively and fixedly provided with U-shaped seat, and left branch has been respectively articulated in two U-shaped seats
The outer end of arm and right support arm, left support arm and right support arm is respectively and fixedly provided with dumbbell；Motor is fixed on upper axis in the form of output shaft upward
Top, lower roll and upper roll, lower roll, upper roll point are successively fixed on the output shaft of motor from the bottom to top
It is not connected through drawstring with the outer end of left support arm and right support arm.
The conservation of angular momentum experiment instrument of the utility model, the motor are direct current generator, are fixed with battery on turntable, store
The power end of battery is connected through conducting wire with the feeder ear of direct current generator.
The conservation of angular momentum experiment instrument of the utility model is fixed with swinging plate on the lateral surface of the turntable.
The conservation of angular momentum experiment instrument of the utility model, the left support arm and right support arm are hingedly connected to two U by pin shaft
On shape seat.
The beneficial effects of the utility model are: the conservation of angular momentum experiment instrument of the utility model, the spool on turntable passes through
Bearing is set in the cylinder on pedestal, realizes being freely rotated for turntable；By the way that two U-shaped seats are arranged on the upper axis of turntable,
Left support arm and right support arm are articulated in U-shaped seat, and left support arm and right support arm pass through the coiling on drawstring and motor output shaft
Axis is connected, in this way, can be enabled after left support arm, right support arm, motor, dumbbell follow turntable to rotate by the rotation of motor
Bracing wire drives left support arm and right support arm inwardly to move, and the distance r for being equivalent to mass center to the shaft of object reduces, at this time turn of turntable
Dynamic speed will increase, so that the conservation of angular momentum visually is presented out, both cultivate the dense experimental interests of students,
Facilitate student to the profound understanding of the principles of science, is conducive to bring into play in actual production from now on, beneficial effect is significant.
Detailed description of the invention
Fig. 1 is the main view of the conservation of angular momentum experiment instrument of the utility model；
Fig. 2 is the top view of the conservation of angular momentum experiment instrument of the utility model；
Fig. 3 is the usage state diagram of the conservation of angular momentum experiment instrument of the utility model.
In figure: 1 pedestal, 2 turntables, 3 motors, axis on 4,5 lower axles, 6 cylinders, 7 bearings, 8 U-shaped seats, 9 left support arms, 10 right branch
Arm, 11 dumbbells, 12 descend rolls, roll on 13,14 batteries, 15 swinging plates, 16 drawstrings, 17 pin shafts.
Specific embodiment
The utility model is described in further detail with embodiment with reference to the accompanying drawing.
As depicted in figs. 1 and 2, the main view and vertical view of the conservation of angular momentum experiment instrument of the utility model is set forth
Figure, shown in conservation of angular momentum experiment instrument by pedestal 1, turntable 2, motor 3, upper axis 4, lower axle 5, cylinder 6, U-shaped seat 8, left support arm
9, right support arm 10, battery 14 and drawstring 16 form, and pedestal 1, which serves, to be fixed and supported, and pedestal 1 is used to be placed in ground,
Cylinder 6 is fixed on the center of pedestal 1, the upper end opening of cylinder 6.Upper axis 4 and lower axle 5 be individually fixed in turntable 2 upper surface and
On the center of lower surface, lower axle 5 is inserted in cylinder 6, and realizes that the rotation in cylinder 6 is fixed by two bearings 7, in this way, turning
Disk 2 can be rotated under basic friction free state.
The two sides of upper 4 upper end of axis are respectively and fixedly provided with U-shaped seat 8, and the inner end of left support arm 9 and right support arm 10 passes through pin shaft 17 and distinguishes
It is articulated in two U-shaped seats 8, to realize rotation of the inner end of left support arm 9 and right support arm 10 in U-shaped seat 8.Left support arm 9 and right branch
The outer end of arm 10 is respectively and fixedly provided with dumbbell 11, and the weight of dumbbell 11 is big, when dumbbell 11 inwardly occurs mobile, the mass center of object can be made to become
It moves larger.Motor 3 is fixed on the top of upper axis 4 in the form of output shaft direction, is fixed with lower roll on the output shaft of motor 3
12 and upper roll 13, the drawstring 16 on lower roll 12 is connected with the outer end of left support arm 9, the drawstring 16 on upper roll 13
It is connected with the outer end of right support arm 9.In this way, left support arm 9 and right support arm 10 can be made by horizontal under the driving effect of motor 3
State is drawn close inwardly, to reduce the mass center of entire rotation system to the distance of shaft.
Battery 14 is provided on shown turntable 2, motor 3 uses direct current generator, and 14 power end of battery connects with motor 3
Line end connection, so that battery 14 is powered direct current generator.Battery 14 to the power on/off of motor 3 by wireless remote control into
Row control.It is fixed with swinging plate 15 on the side of shown turntable 2, experimenter is by that can drive rotation with power drive swinging plate 15
Turntable 15 is rotated together together with upper axis 4, lower axle 5, motor 3, left support arm 9, right support arm 10.
As shown in figure 3, the usage state diagram of the conservation of angular momentum experiment instrument of the utility model is given, when turntable 2 rotates
After getting up, left support arm 9 and right support arm 10 at this time is in horizontality, and the dumbbell 11 at both ends is also apart from shaft (on i.e.
The axle center of axis 4) distance it is maximum.At this point, making motor 3 using the winding to drawstring 16, by left 9 He of support arm if opening motor 3
Right support arm 10 rotates upward so that the dumbbell 11 at its both ends is close to shaft, according to angular momentum conservation law it is found that when formula L=
r×p=r×(mv)=mr2In ω, when r reduces, angular velocity omega should increase, and whether the velocity of rotation by observing turntable 2 increases i.e.
It can obtain.
Claims (4)
1. the center of a kind of conservation of angular momentum experiment instrument, including pedestal (1), turntable (2) and motor (3), base upper surface is fixed
Have vertical cylinder (6), axis (4) and lower axle (5) are respectively fixed on the center of disk upper surface and lower surface；Its feature exists
In: the lower axle is rotatably dispose in cylinder (6) through bearing (7), and the two sides on upper axis top are respectively and fixedly provided with U-shaped seat (8), two U-shapeds
Left support arm (9) and right support arm (10) have been respectively articulated in seat, and the outer end of left support arm and right support arm is respectively and fixedly provided with dumbbell (11)；Motor
It is fixed on the top of upper axis in the form of output shaft upward, is successively fixed with lower roll from the bottom to top on the output shaft of motor
(12) it is connected respectively through drawstring (16) with the outer end of left support arm and right support arm with upper roll (13), lower roll, upper roll
It connects.
2. conservation of angular momentum experiment instrument according to claim 1, it is characterised in that: the motor (3) is direct current generator, is turned
It is fixed on disk (2) battery (14), the power end of battery is connected through conducting wire with the feeder ear of direct current generator.
3. conservation of angular momentum experiment instrument according to claim 1 or 2, it is characterised in that: on the lateral surface of the turntable (2)
It is fixed with swinging plate (15).
4. conservation of angular momentum experiment instrument according to claim 1 or 2, it is characterised in that: the left support arm (9) and right support arm
(10) it is hingedly connected on two U-shaped seats (8) by pin shaft (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820438211.7U CN208673577U (en) | 2018-03-29 | 2018-03-29 | A kind of conservation of angular momentum experiment instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820438211.7U CN208673577U (en) | 2018-03-29 | 2018-03-29 | A kind of conservation of angular momentum experiment instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208673577U true CN208673577U (en) | 2019-03-29 |
Family
ID=65822864
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820438211.7U Expired - Fee Related CN208673577U (en) | 2018-03-29 | 2018-03-29 | A kind of conservation of angular momentum experiment instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208673577U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110827630A (en) * | 2019-11-12 | 2020-02-21 | 哈尔滨工程大学 | Novel Cofski stool |
-
2018
- 2018-03-29 CN CN201820438211.7U patent/CN208673577U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110827630A (en) * | 2019-11-12 | 2020-02-21 | 哈尔滨工程大学 | Novel Cofski stool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190329 Termination date: 20200329 |