CN201262794Y

CN201262794Y - Demonstration instrument for teaching force parallelogram rule

Info

Publication number: CN201262794Y
Application number: CNU2008200269249U
Authority: CN
Inventors: 梁冰
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-08-20
Filing date: 2008-08-20
Publication date: 2009-06-24
Anticipated expiration: 2018-08-20

Abstract

The utility model provides a physics teaching demonstration instrument. A hanging ring is arranged at the top of a backboard of the device, a dynamometer is arranged at the lower part of the hanging ring, a circular ring is connected at the lower end of the dynamometer, a protractor is fixedly arranged on the circular ring, two rope yarns and one check line are connected at the lower part of the circular ring; two arc-shaped slideways are arranged at the middle part of the backboard, one end of a rotary dividing ruler is fixed on the arc-shaped slideway through a fixing nut, and a dial disc is arranged between the fixing nut and the arc-shaped slideway. The device is characterized by convenient use, simple structure, high accuracy, and the like, and can lead students to verify the parallelogram law of force from experiments and lead the boring theoretical knowledge to be very easy to understand and remember, thereby having better teaching demonstration effect; furthermore, the backboard of the device is made of frosted glass materials, thereby facilitating a teacher to use a chalk to draw lines for marking during the teaching in class, so that the device has great promotion and using values.

Description

Parallelogram of forces rule teaching demonstrator

1, technical field

The utility model relates to a kind of physics teaching demonstrator, a kind of specifically parallelogram of forces rule teaching demonstrator.

2, background technology

Need to learn this knowledge point of parallelogram of forces rule in the senior middle school physics curriculum now, the student understands the difficulty of comparison when contacting this respect knowledge for the first time, there do not have corresponding demonstration equipment teacher to explain to be also very difficult, some teacher can oneself install a fairly simple demonstration instrument to students explanation demonstration, but bigger error can appear in such instrument, designs also to be unfavorable for the understanding that the student is correct under irrational situation and to grasp this knowledge point.

3, summary of the invention

The purpose of this utility model is to overcome above-mentioned shortcoming, provides a kind of equipment simple, easy to use, the parallelogram of forces rule teaching demonstrator that teaching demonstration is effective.

The technical solution of the utility model realizes in the following manner, its structure is made of dynamometer, annulus, protractor, rope yarn, cambered way, hold-down nut, dial disc, rotation rule, backboard, shelf, check line and link, the top of backboard is provided with link, the bottom of link is provided with dynamometer, the lower end of dynamometer is connected with annulus, be fixed with protractor on the annulus, the bottom of annulus is connected with two rope yarns and a check line; The middle part of backboard is provided with two cambered waies, and an end of rotation rule is fixed on the cambered way by hold-down nut, is provided with dial disc between hold-down nut and the cambered way.

Backboard is selected the ground glass material for use, is set to shelf in the bottom of backboard.

The utility model has the advantages that:

(1), the utility model is easy to use, simple in structure, the accuracy height can allow student's checking parallelogram of forces rule from experiment, uninteresting knowwhy is become be very easy to understand and memory, has teaching demonstration effect preferably.

(2), the backboard of this device selects for use the ground glass material to form, and makes things convenient for teacher's time standby drawing with coloured chalk wire tag of explanation on class.

(3), use in the process of this device the accuracy of pick-up unit voluntarily, overcome the possibility that error occurs.

4, description of drawings

Accompanying drawing is the structural representation of parallelogram of forces rule teaching with demonstrator;

Mark in the accompanying drawing is represented respectively;

1, dynamometer; 2, annulus; 3, protractor; 4, rope yarn; 5, cambered way; 6, hold-down nut; 7, dial disc; 8, rotation rule; 9, backboard; 10, shelf; 11, check line; 12, link.

5, embodiment

Below in conjunction with accompanying drawing the teaching of the utility model parallelogram of forces rule is done following detailed description the in detail with demonstrator.

As shown in drawings, the teaching of the utility model parallelogram of forces rule is made of dynamometer 1, annulus 2, protractor 3, rope yarn 4, cambered way 5, hold-down nut 6, dial disc 7, rotation rule 8, backboard 9, shelf 10, check line 11 and link 12 with its structure of demonstrator, the top of backboard 9 is provided with link 12, the bottom of link 12 is provided with dynamometer 1, the lower end of dynamometer 1 is connected with annulus 2, be fixed with protractor 3 on the annulus 2, the bottom of annulus 2 is connected with two rope yarns 4 and a check line 11; The middle part of backboard 9 is provided with two cambered waies 5, and an end of rotation rule 8 is fixed on the cambered way 5 by hold-down nut 6, is provided with dial disc 7 between hold-down nut 6 and the cambered way 5.

The bottom of backboard 9 is set to shelf 10, the convenient article of placing.

Dial disc 7 is for being marked with the disk of 360 degree scale values.

When using this teaching to use demonstrator, at first regulating the protractor 3 of hold-down nut 6 by top makes two rope yarns 4 form the angle of setting, hang up counterweight in the bottom of rope yarn 4 then, rotate rotation rule 8 and make rotation rule 8 parallel with rope yarn 4 by dial disc 7, cotton rope 4 and rotation rule 8 have promptly surrounded a parallelogram; Read with joint efforts and the size of component by the numerical value of dynamometer 1 and counterweight, measure the length of check line 11, the last length of on backboard 9, setting out Niu Li representative, according to make a concerted effort and component between angular relationship and the length of each power representative parallelogram that draws, can verify the parallelogram of forces rule.

The teaching of the utility model parallelogram of forces rule is very simple and convenient with its processing and fabricating of demonstrator, can process shown in the accompanying drawing to specifications.

Except that the described technical characterictic of instructions, be the known technology of those skilled in the art.

Claims

1, parallelogram of forces rule teaching demonstrator, it is characterized in that constituting by dynamometer, annulus, protractor, rope yarn, cambered way, hold-down nut, dial disc, rotation rule, backboard, shelf, check line and link, the top of backboard is provided with link, the bottom of link is provided with dynamometer, the lower end of dynamometer is connected with annulus, be fixed with protractor on the annulus, the bottom of annulus is connected with two rope yarns and a check line; The middle part of backboard is provided with two cambered waies, and an end of rotation rule is fixed on the cambered way by hold-down nut, is provided with dial disc between hold-down nut and the cambered way.

2, demonstrator is used in parallelogram of forces rule teaching according to claim 1, it is characterized in that the bottom of backboard is set to shelf.