CN201255944Y - Single pendulum capable of gravitation acceleration changing - Google Patents
Single pendulum capable of gravitation acceleration changing Download PDFInfo
- Publication number
- CN201255944Y CN201255944Y CNU2008201882254U CN200820188225U CN201255944Y CN 201255944 Y CN201255944 Y CN 201255944Y CN U2008201882254 U CNU2008201882254 U CN U2008201882254U CN 200820188225 U CN200820188225 U CN 200820188225U CN 201255944 Y CN201255944 Y CN 201255944Y
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- China
- Prior art keywords
- single pendulum
- gravity
- acceleration
- electromagnet
- suspension wire
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Abstract
Disclosed is a single pendulum capable of changing gravitational acceleration values, a transverse support bar is fixed on a stand, a suspension wire is fixed on the transverse support bar, the lower end of the suspension wire is hung with a ball body, the ball body is a steel ball, and an electromagnet is arranged on the stand and below the ball body. The utility model is used to study and show the relationship between the vibration period of the single pendulum and the gravitational acceleration, a gravitational field is changed through a magnetic field of the electromagnet, and then, a scene of changing the gravitational acceleration is created by a simulation method, thereby the relationship of the vibration period of the single pendulum and the gravitational acceleration can be conveniently viewed with visualized display, and hands-on experiments are easy for students. Further, the utility model is simple in structure and convenient in popularization.
Description
Technical field:
The utility model relates to a kind of single pendulum that changes gravity acceleration value, is used to study and demonstrate the vibration period of single pendulum and the relation between the acceleration of gravity.
Background technology:
In theory, the pass between the vibration period T of single pendulum, the pendulum length L of single pendulum, the gravity acceleration g three is: the square root of period T and pendulum length L is directly proportional and the square root of local gravity acceleration g is inversely proportional to, and scale-up factor is 2 π.Relational expression is: T=2 π √ L/g or g=4 π
2L/T
2, can measure local acceleration of gravity with this relational expression.
It is easily that the square root that will observe the vibration period T of single pendulum and pendulum length L qualitatively is directly proportional, as long as observe the single pendulum of several groups of different pendulum lengths, it is long long hunting period to observe suspension wire significantly, weak point hunting period that suspension wire is short.This phenomenon has been observed by the great scientist's Galileo before the centuries already, and has been applied on the clock.But it but is not so easy that the square root that wants to observe period T and gravity acceleration g is inversely proportional to, because acceleration of gravity is only relevant with the diverse location and the differing heights of the earth.At the diverse location of the earth, the variation of acceleration of gravity not clearly, even compare with equator and the two poles of the earth of the earth, the acceleration of gravity in equator is 9.78 meter per seconds
2, the acceleration of gravity at the two poles of the earth is 9.83 meter per seconds
2Therefore, promptly allow to observe simultaneously under the line two groups of single pendulums with the two poles of the earth, only also to be not easy just can to differentiate which with naked eyes long in cycle, and which short in cycle.Moreover we may not observe respectively under the line two groups of single pendulums with the two poles of the earth simultaneously.Gravity acceleration g is with highly relevant, between the pass be: gravity acceleration g and arrive square being inversely proportional to of geocentric distance.6400000 meters of the radius average out to of the earth, if highly increase several kms or a myriametre, this numerical value is still very little for huge earth radius, reducing of acceleration of gravity also is little.So, even single pendulum is taken on Mountain Everest, only to observe with eyes, the cycle that also can not observe single pendulum has obvious variation.Want to observe obvious variation a little, must take high-altitude more than 1000 kilometers to single pendulum, obviously, can't accomplish in the ordinary course of things.Therefore, the instrument that also not have now preferably the square root in order to vibration period T that single pendulum is described and gravity acceleration g be inversely proportional to.
Summary of the invention:
The purpose of this utility model provides a kind of single pendulum that changes gravity acceleration value, is used to observe the experiment that the square root of the vibration period T of single pendulum and gravity acceleration g is inversely proportional to.Applying a magnetic field is strengthened gravity field, with the method for simulating the g value is changed.
The purpose of this utility model realizes as follows: fix a cross support arm on support, fix a suspension wire on the cross support arm, the lower end of suspension wire hangs a spheroid, and spheroid is a steel ball, and the bottom that is in spheroid on the support is provided with electromagnet.
During demonstration, if without electromagnet, this is a common single pendulum, measures its pendulum length, and promptly the length of suspension wire adds the radius of magnet ball, measures its vibration period, just can ask the calculating of local g value.Electromagnet coil power makes electromagnet attract top steel ball, and this just is equivalent to steel ball and becomes heavier, can see that at this moment the vibration period of single pendulum diminishes, and the frequency of vibration accelerates, and it is big that the g value of measuring becomes.Magnet coil passes to different voltage, just can measure different g values.Its inreal g value that changes just changes gravity field with magnetic field, with the method for simulation, has created a scene that acceleration of gravity changes, thereby has realized technical purpose.
The beneficial effects of the utility model are: adopt it can observe the vibration period of single pendulum and the relation of acceleration of gravity easily, and intuitive display, the student starts to test easily, and is simple in structure, is convenient to promote.
Description of drawings:
Accompanying drawing is the structural representation that the utility model can change the single pendulum of gravity acceleration value.
Embodiment:
With reference to accompanying drawing, on support 1, fix a cross support arm 2, fix a suspension wire 3 on the cross support arm 2, the lower end of suspension wire 3 hangs a spheroid 4, spheroid 4 is a steel ball, and the bottom that is in spheroid 4 on the support 1 is provided with electromagnet 5, and the coil 6 of electromagnet 5 connects tunable voltage dc power supply by lead 7.Participation by electromagnet 5 changes gravity field with magnetic field, has created a scene that acceleration of gravity changes with the method for simulation.
Claims (1)
- A kind of single pendulum that changes gravity acceleration value, fix a cross support arm on support, fix a suspension wire on the cross support arm, the lower end of suspension wire hangs a spheroid, it is characterized in that: spheroid (4) is a steel ball, and the bottom that is in spheroid (4) on the support (1) is provided with electromagnet (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201882254U CN201255944Y (en) | 2008-09-10 | 2008-09-10 | Single pendulum capable of gravitation acceleration changing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201882254U CN201255944Y (en) | 2008-09-10 | 2008-09-10 | Single pendulum capable of gravitation acceleration changing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201255944Y true CN201255944Y (en) | 2009-06-10 |
Family
ID=40739270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201882254U Expired - Fee Related CN201255944Y (en) | 2008-09-10 | 2008-09-10 | Single pendulum capable of gravitation acceleration changing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201255944Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467843A (en) * | 2010-11-16 | 2012-05-23 | 陈渝德 | Electromagnetic pendulum experiment instrument |
-
2008
- 2008-09-10 CN CNU2008201882254U patent/CN201255944Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102467843A (en) * | 2010-11-16 | 2012-05-23 | 陈渝德 | Electromagnetic pendulum experiment instrument |
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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: 20090610 |