CN201000682Y - Circular motion research instrument - Google Patents
Circular motion research instrument Download PDFInfo
- Publication number
- CN201000682Y CN201000682Y CNU2007200949835U CN200720094983U CN201000682Y CN 201000682 Y CN201000682 Y CN 201000682Y CN U2007200949835 U CNU2007200949835 U CN U2007200949835U CN 200720094983 U CN200720094983 U CN 200720094983U CN 201000682 Y CN201000682 Y CN 201000682Y
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- Prior art keywords
- balance
- dolly
- centripetal force
- gear
- rolling groove
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Abstract
The utility model relates to a circular motion researching instrument for the middle school student physics group experimental teaching, which mainly comprises a base plate, a motor, a binding post, a trolley rolling groove, a spring dynamometer sliding groove, a spring dynamometer and a balance indicating end. A balance indicating mechanism is firmly connected on a T-shaped plate at one end of a bracket double arm, a balance indicating plate is firmly connected with the T-shaped plate, the indicating end is connected with the balance indicating plate in a pin connection way through an indicating end seat, a wire hanging frame and a wire hanging lug are firmly connected with the indicating end seat, one end of the wire hanging frame tied a thin wire is connected with the spring dynamometer arranged in the sliding groove, one end of the wire hanging lug tied a thin wire connected with the trolley, one end at the bottom part of the rolling groove is firmly connected with the output axle of the motor with a pinion gear, the pinion gear is geared with the bull gear of a gear speed measuring case. The utility model has the advantages that the device makes students read out the centripetal force value when quality, angular speed and semidiameter through the practical demonstration are respectively changed through measuring the revolution speed mechanism and the centripetal force mechanism, and find out the relational graph of the physical quantity and the centripetal force, thus the centripetal force formula is deduced.
Description
Technical field
The utility model belongs to teaching appliance, relates in particular to a kind of circular motion research instrument for the experimental teaching of middle school student's physical packets.
Background technology
Object is done the teaching of centripetal force one joint of circular motion in the senior middle school physics curriculum, is the difficult point of generally acknowledging always.Main cause is that object is made the quality of needed centripetal force of circular motion and object, angular velocity, (the F=m ω of the relational expression between the radius of circular motion
2R), owing to can not draw with method more intuitively, many students learn will can remember the centripetal force formula by memorize mechanicalling just here.Owing to lack understanding, cause the student to use this formula and deal with problems and bring very big difficulty the formula source.The people of latest edition teaches the method that adopts in the Socialist Education Movement material to be: release the expression formula of centripetal acceleration theoretically by the variable quantity of speed, again according to Newton second law, obtain the expression formula of centripetal force.Used the way of thinking of a large amount of limit in the process.From the theory to the theory.Find in the teaching practice that the student accepts very difficult.Because the student lacks necessary experience in the process of study, can not receive the anticipation teaching effect.
The utility model content
The purpose of this utility model is to overcome the deficiency of above-mentioned technology, and a kind of circular motion research instrument is provided, and it is simple to operate, and principle is directly perceived, and error is less, and is cheap because of the low cost of manufacture of cost again, is fit to student experiment in group.The student is improved to the quantitative work experiment with the qualitative lecture experiment of centripetal force, makes the student play great role to the understanding and the application of centripetal force formula.
The utility model for achieving the above object, by the following technical solutions: a kind of circular motion research instrument, it is characterized in that: mainly by the chassis, support, motor, binding post, the dolly rolling groove, the weight beam chute, weight beam, the gear case that tests the speed, the balance pointer is formed, described two-armed spider is fixed on the chassis, affixed balance indicating mechanism on the T shape plate of support both arms one end, indicating mechanism comprises the balance dial plate, pointer, flex holder and lanyard ear, described balance dial plate and T shape plate are affixed, pointer is by hand rest and balance dial plate pin joint, flex holder and lanyard ear and hand rest are affixed, and be bascule with bearing pin, flex holder one end is a fine rule, weight beam in brush line is crossed pulley and placed chute is connected, lanyard ear one end is a cord, cord is connected with dolly in placing the dolly rolling groove by idle wheel, described dolly rolling groove one bottom portion is affixed with the motor output shaft that is provided with pinion wheel, the test the speed gear wheel engagement of case of described pinion wheel and gear, the pinion that gear wheel is coaxial with outer rotor, described binding post are fixed on the wiring support that is connected with the chassis.
The cord adjustable length of described dolly.
The beneficial effects of the utility model: this device makes the student pass through actual presentation by survey rotating speed mechanism and direction detector force mechanisms can change quality, angular velocity, radius respectively, at any time read centripetal force numerical value, find out the image that concerns of above-mentioned physical quantity and centripetal force respectively, thereby draw the centripetal force formula.
Description of drawings
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is that quality and centripetal force concern coordinate diagram;
Fig. 3 is that radius and centripetal force concern coordinate diagram;
Fig. 4 is that angular velocity and centripetal force concern coordinate diagram.
Embodiment
Describe embodiment of the present utility model in detail below in conjunction with accompanying drawing and preferred embodiment.
As shown in the figure, a kind of circular motion research instrument, mainly by chassis 1, support 2, motor 3, binding post 4, dolly rolling groove 5, chute 6, weight beam 7, the gear case 8 that tests the speed, balance indicating mechanism 9 forms, described two-armed spider 2-1 is fixed on the chassis, the upward affixed balance of the T shape plate 2-2 of support both arms one end indicating mechanism, indicating mechanism comprises balance dial plate 9-1, pointer 9-2, flex holder 9-3 and lanyard ear 9-4, described balance dial plate and T shape plate 2-2 are affixed, pointer is by hand rest 9-5 and balance dial plate pin joint, flex holder and lanyard ear and hand rest are affixed, and be bascule with bearing pin, can not influence the radius that dolly is made circular motion in the time of can guaranteeing weight beam 7 deformation.Flex holder one end is a fine rule 10, weight beam 7 in brush line is crossed pulley 11 and placed chute is connected, lanyard ear 9-4 one end is a cord 12, cord is connected with dolly 14 in placing the dolly rolling groove by idle wheel 13, the cord adjustable length of described dolly, change the radius that dolly is made circular motion by adjusting cord length, adopt rule directly to measure the radius that dolly is made circular motion.The dolly sole mass is 6.2 grams, can place counterweight on dolly, changes the quality of dolly.Described dolly rolling groove one bottom portion is affixed with the motor output shaft that is provided with pinion wheel 15, the test the speed gear wheel 8-1 engagement of case 8 of described pinion wheel 15 and gear, and the coaxial pinion wheel 8-3 of gear wheel and outer rotor 8-2 meshes.Gear ratio is 180/10 * 180/12=270/1, and the rotation period T that can measure dolly rolling groove 5 can obtain angular velocity by utilizing ω=2 π/T.Described binding post is fixed on the wiring support 16 that is connected with the chassis, connects by divider resistance 17 between the binding post, can adjust rotating speed of motor when power supply is received different binding posts, thereby changes the ω value.This device can adopt organic glass or injection molding, and its middle gear can adopt plastics or metal to make.This instrument is used to probe into centripetal force formula F=m ω for the experimental teaching of middle school student's physical packets
2The usefulness of r.Performance index: adopt student's power supply 4.5V shelves; Weight beam range 1N.Using method: student's power supply is put into the 4.5V shelves, and teaching aid both positive and negative polarity button is chosen, and connects lead; Bead is put into dolly rolling groove appropriate location; Weight beam colludes the fine rule rope; Weigh up the dolly quality.
Experimentation:
(1) probe into quality m and centripetal force F relation:
1, the fixing length of line on the dolly, the fixed electrical machinery input voltage, do not put the counterweight sheet in the dolly, this moment, the dolly quality was 6.2 grams, opened motor, this moment, the driven by motor sliding tray rotated, when dolly when a certain position is static in groove, pulling weight beam, when observing the balance pointer and pointing to index dial balance center line, read the data of weight beam, then deenergization.
2, dolly adds the counterweight sheet successively, and dolly quality under the meter still according to method 1 experiment, obtains weight beam numerical value, i.e. the centripetal force value successively respectively.
3, the quality and the centripetal force value that obtain are made image, draw and concern conclusion.
(2), probe into radius r and centripetal force F relation:
1, the cord on the dolly is tightened to a less position of radius;
2, energized, method reads the weight beam registration with experiment one;
3, regulate cord length on the dolly successively, the dolly radius of gyration is increased 1cm at every turn, repeat aforesaid operations respectively, meter lower spring dynamometry evaluation;
4, draw radius and centripetal force image draw and concern conclusion.
(3), probe into angular velocity omega and centripetal force F relation:
1, earlier motor speed is adjusted to the fastest shelves;
2, measure outer rotor with stopwatch and rotate a cycle t, then (large and small gear ratio is 180/10 * 180/12=270) to motor period T=t/270, utilizes ω=2 π/T to obtain angular velocity, and method is read centripetal force with (one);
3, the divider resistance of change access is transferred motor speed gear shift successively slowly, obtains acceleration ω and centripetal force F respectively, makes acceleration ω and centripetal force image, draws to concern conclusion.
Points for attention: when observing the weight beam reading, treat the stable back of pointer reading;
Angle measurement speed will be from angular velocity greatly to measuring for a short time.
Data processing:
(1) radius r, angular velocity omega are certain, probe into quality m and centripetal force F relation:
| m(g) | F(N) | |
| 1 | 6.2 | 0.46 |
| 2 | 8.2 | 0.59 |
| 3 | 10.2 | 0.69 |
| 4 | 12.2 | 0.84 |
| 5 | 14.2 | 0.97 |
(2) quality m, angular velocity omega are certain, probe into radius r and centripetal force F relation:
Chart:
| r(cm) | F(N) | |
| 1 | 3.4 | 0.41 |
| 2 | 4.2 | 0.54 |
| 3 | 5 | 0.6 |
| 4 | 5.4 | 0.75 |
| 5 | 6 | 0.79 |
| 6 | 6.4 | 0.85 |
| 7 | 6.7 | 0.89 |
(3) quality m, radius r are certain, probe into angular velocity omega and centripetal force F relation:
Chart:
| ω(rad/s) | F(N) | |
| 1 | 9.29 | 0.1 |
| 2 | 13.56 | 0.16 |
| 3 | 1 5.4 | 0.18 |
| 4 | 19.5 | 0.38 |
| 5 | 21.88 | 0.52 |
| 6 | 24.93 | 0.7 |
| 7 | 29.23 | 0.99 |
The above only is preferred embodiment of the present utility model, is not structure of the present utility model is done any pro forma restriction.Every foundation technical spirit of the present utility model all still belongs in the scope of the technical solution of the utility model any simple modification, equivalent variations and modification that above embodiment did.
Claims (2)
1, a kind of circular motion research instrument, it is characterized in that: mainly by the chassis, support, motor, binding post, the dolly rolling groove, the weight beam chute, weight beam, the gear case that tests the speed, the balance pointer is formed, described two-armed spider is fixed on the chassis, affixed balance indicating mechanism on the T shape plate of support both arms one end, indicating mechanism comprises the balance dial plate, pointer, flex holder and lanyard ear, described balance dial plate and T shape plate are affixed, pointer is by hand rest and balance dial plate pin joint, flex holder and lanyard ear and hand rest are affixed, and be bascule with bearing pin, flex holder one end is a fine rule, weight beam in brush line is crossed pulley and placed chute is connected, lanyard ear one end is a cord, cord is connected with dolly in placing the dolly rolling groove by idle wheel, described dolly rolling groove one bottom portion is affixed with the motor output shaft that is provided with pinion wheel, the test the speed gear wheel engagement of case of described pinion wheel and gear, the pinion that gear wheel is coaxial with outer rotor, described binding post are fixed on the wiring support that is connected with the chassis.
2, circular motion research instrument according to claim 1 is characterized in that: the cord adjustable length of described dolly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200949835U CN201000682Y (en) | 2007-01-17 | 2007-01-17 | Circular motion research instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200949835U CN201000682Y (en) | 2007-01-17 | 2007-01-17 | Circular motion research instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201000682Y true CN201000682Y (en) | 2008-01-02 |
Family
ID=39015086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200949835U Expired - Fee Related CN201000682Y (en) | 2007-01-17 | 2007-01-17 | Circular motion research instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201000682Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971563A (en) * | 2014-05-04 | 2014-08-06 | 四川大学 | Device for measuring gravitational acceleration by lengthening pendulum length of compound pendulum through magnetic attraction |
| CN106601092A (en) * | 2016-12-20 | 2017-04-26 | 安徽理工大学 | Centripetal force demonstrator |
| CN106601088A (en) * | 2016-12-20 | 2017-04-26 | 安徽理工大学 | Centripetal force demonstration apparatus |
-
2007
- 2007-01-17 CN CNU2007200949835U patent/CN201000682Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971563A (en) * | 2014-05-04 | 2014-08-06 | 四川大学 | Device for measuring gravitational acceleration by lengthening pendulum length of compound pendulum through magnetic attraction |
| CN103971563B (en) * | 2014-05-04 | 2016-07-06 | 四川大学 | A kind of magnetic attracts to extend physical pendulum pendulum length and measures acceleration of gravity |
| CN106601092A (en) * | 2016-12-20 | 2017-04-26 | 安徽理工大学 | Centripetal force demonstrator |
| CN106601088A (en) * | 2016-12-20 | 2017-04-26 | 安徽理工大学 | Centripetal force demonstration apparatus |
| CN106601088B (en) * | 2016-12-20 | 2018-10-12 | 安徽理工大学 | A kind of centripetal force demonstration apparatus |
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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: 20080102 |