CN203870862U - Novel self-made lever principle demonstration device - Google Patents
Novel self-made lever principle demonstration device Download PDFInfo
- Publication number
- CN203870862U CN203870862U CN201420278942.1U CN201420278942U CN203870862U CN 203870862 U CN203870862 U CN 203870862U CN 201420278942 U CN201420278942 U CN 201420278942U CN 203870862 U CN203870862 U CN 203870862U
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- cross bar
- lever principle
- support
- cross rod
- novel self
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Abstract
The utility model discloses a novel self-made lever principle demonstration device which comprises a cross rod and a supporting rod. The upper side of the cross rod is provided with a detachable hanging hook. The cross rod is provided with scales. The cross rod is detachably connected with the supporting rod. The two ends of the cross rod are respectively in threaded connection with a fine-tuning nut. The cross rod is uniformly provided with eight circular iron hoops for hanging weights. The supporting rod is fixedly arranged on a support. The upper side of the support and the lower side of the cross rod are respectively provided with a plurality of hanging holes. The self-made lever principle demonstration device is simple in structure, reasonable in design, and convenient for students to observe and do the experiment by themselves, thereby reducing the teaching burden of teachers, improving the learning interest of the students, and helping the students to better understand and grasp relevant knowledge of the lever principle.
Description
Technical field
The utility model belongs to junior middle school physics teaching field, especially relates to a kind of novel self-control lever principle apparatus for demonstrating.
Background technology
Lever principle also claims " lever balance ", make lever balance, acting on two moments on the lever product of the arm of force (power with) size must equate, that is: power is multiplied by power arm and equals resistance and be multiplied by resistance arm, is expressed as F1L1=F2L2 by algebraic expression, in formula, F1 represents power, L1 represents power arm, and F2 represents resistance, and L2 represents.
At present, in Physics Course, concept and laws many on textbook all need experiment to demonstrate and prove, meeting student understands more intuitively and grasps knowledge, especially in the teaching of power and the arm of force, while studying the equilibrium condition of lever, teacher uses original lever teaching aid conventionally, these teaching aids are all made up of support and lever, the function singleness of this lever, only can demonstrate lever basic function and principle, complex operation, not portable yet, and can only be placed on lectern, can not be fixed on blackboard and test, row student's study after impact like this, increase the difficulty of giving lessons.
Summary of the invention
Problem to be solved in the utility model is to provide a kind of novel self-control lever principle apparatus for demonstrating, this apparatus structure is simple, reasonable in design, facilitate observation of students, improve students ' practical ability and the interest to Physics Learning, better understand and master lever principle relevant knowledge.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of novel self-control lever principle apparatus for demonstrating, comprise cross bar and support bar, the upside of described cross bar is provided with dismountable hook, described cross bar is with scale, described cross bar and described support bar removably connect, the two ends of the described cross bar fine-tuning nut that has been threaded, on described cross bar, be uniformly distributed the round iron ring of eight suspension counterweights, described support bar is fixed on support, and described support upside, described cross bar downside are equipped with several hanging holes.
Described round iron ring is detachable round iron ring.
The hanging hole in described support left side is connected with the hanging hole in described cross bar left side by elastic device.
The hanging hole on described support right side is connected with the hanging hole on described cross bar right side by elastic device.
Described support bar is metal retractable support lever.
Owing to adopting technique scheme, this utility structure is simple, reasonable in design, has the observation of students of convenience and start to test, and has alleviated teacher's teaching load, improves the advantage of student's learning interest.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model;
Wherein, 1, hook, 2, cross bar, 3, fine-tuning nut, 4, support bar, 5, support, 6, round iron ring, 7, hanging hole.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further illustrated.
As shown in Figure 1, a kind of novel self-control lever principle apparatus for demonstrating, comprise cross bar 2 and support bar 4, the upside of cross bar 2 is provided with dismountable hook 1, and cross bar 2 is with scale, cross bar 2 removably connects with support bar 4, support bar 4 is metal retractable support lever 4, and the two ends of cross bar 2 fine-tuning nut 3 that has been threaded is uniformly distributed the detachable round iron ring 6 of eight suspension counterweights on cross bar 2, support bar 4 is fixed on support 5, and support 5 upsides, cross bar 2 downsides are equipped with several hanging holes 7.
The hanging hole 7 in support 5 left sides can be connected with the hanging hole 7 in cross bar 2 left sides by spring; The hanging hole 7 on support 5 right sides can be connected with the hanging hole 7 on cross bar 2 right sides by spring; Support bar 4 and cross bar 2 hinged places can with dismountable arm of force dip stick hinge.
The course of work of this example:
Dismantle support bar 4 and support 5, teacher can be suspended to device on blackboard, to demonstrate lever principle experiment with hook 1.
Dismantle hook 1, round iron ring 6, this device is placed on lectern, or the round iron of dismantling ring 6 is suspended to device on blackboard, taking cross bar 2 with the pin joint of support bar 4 as fulcrum, the power that the spring in support bar 4 left sides applies to cross bar 2 is resistance, and the direction of resistance is the direction of the spring in support bar 4 left sides, rotary arm dip stick, exert all one's strength arm measure chi perpendicular to the spring in support bar 4 left sides, and the distance from pin joint to vertical point is resistance arm; The power that the spring on support bar right side applies to cross bar 2 is power, and the direction of power is the direction of support bar 4 right side springs, rotary arm dip stick, and the arm measure chi of exerting all one's strength is perpendicular to the spring on support bar 4 right sides, and the distance from pin joint to vertical point is power arm.
The position of adjusting spring, in the time that the resistance arm of force is greater than power arm, power is greater than resistance, is now effort lever, in the time that resistance arm is less than power arm, power is less than resistance, is now laborsaving lever, in the time that resistance arm equals power arm, power equals resistance, is now bascule.The utility model makes student be easier to understand lever principle, effort lever, laborsaving lever and these knowledge of bascule, greatly improves the classroom effect of giving lessons.
By reference to the accompanying drawings embodiment of the present utility model is described although above-mentioned; but the not restriction to the utility model protection domain; one of ordinary skill in the art should be understood that; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various amendments that creative work can make or distortion still in protection domain of the present utility model.
Claims (5)
1. a novel self-control lever principle apparatus for demonstrating, comprise cross bar and support bar, it is characterized in that, in the middle of the upside of described cross bar, be provided with dismountable hook, described cross bar, with scale, is characterized in that: described cross bar and described support bar removably connect, the two ends of the described cross bar fine-tuning nut that has been threaded, the round iron ring that is uniformly distributed eight suspension counterweights on described cross bar, described support bar is fixed on support, and described support upside, described cross bar downside are equipped with several hanging holes.
2. the novel self-control lever principle of one as claimed in claim 1 apparatus for demonstrating, is characterized in that, described round iron ring is detachable round iron ring.
3. the novel self-control lever principle of one as claimed in claim 1 apparatus for demonstrating, is characterized in that, the hanging hole in described support left side is connected with the hanging hole in described cross bar left side by elastic device.
4. the novel self-control lever principle of one as claimed in claim 1 apparatus for demonstrating, is characterized in that, the hanging hole on described support right side is connected with the hanging hole on described cross bar right side by elastic device.
5. the novel self-control lever principle of one as claimed in claim 1 apparatus for demonstrating, is characterized in that, described support bar is metal retractable support lever.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420278942.1U CN203870862U (en) | 2014-05-28 | 2014-05-28 | Novel self-made lever principle demonstration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420278942.1U CN203870862U (en) | 2014-05-28 | 2014-05-28 | Novel self-made lever principle demonstration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203870862U true CN203870862U (en) | 2014-10-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420278942.1U Expired - Fee Related CN203870862U (en) | 2014-05-28 | 2014-05-28 | Novel self-made lever principle demonstration device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203870862U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314898A (en) * | 2017-08-04 | 2017-11-03 | 苏州德源机电有限公司 | A kind of tested roller installing mechanism of elevator door-motor roller test machine |
-
2014
- 2014-05-28 CN CN201420278942.1U patent/CN203870862U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107314898A (en) * | 2017-08-04 | 2017-11-03 | 苏州德源机电有限公司 | A kind of tested roller installing mechanism of elevator door-motor roller test machine |
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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: 20141008 Termination date: 20150528 |
|
| EXPY | Termination of patent right or utility model |