CN204102389U - Junior middle school's mechanics multifunctional is probed into, demonstrating experiment device - Google Patents

Abstract

Mechanics multifunctional of a kind of junior middle school is probed into, demonstrating experiment device.This device be in junior middle school's mechanics four important experiments integrate multi-functionally to probe into, demonstrating experiment device.The experiment that can probe into and demonstrate has: balance between two forces, pulley (group) power, distance relation, survey pulley (group) mechanical efficiency, research spring force and (quantitatively) relation of elongation, and can suitably expand.This device perfectly can solve design defect and the deficiency of these four traditional experiment devices.This device is made up of main element and accessory, main part is assembled by three pulleys, two covers screw (screw is joined three nuts and is furnished with metal hanger), two set screws, scaleplate and foot rests, can break very easily and assemble, but generally not break.Fitting part is spring, four single-sheaved blocks, two lightweight veneers, hook code, thin cotton thread and two weight beam compositions of two different elasticity coefficient, because different assemblings is taked in different experiments.

Description

Junior middle school's mechanics multifunctional is probed into, demonstrating experiment device

Technical field

The utility model is a teaching aid very applicable in junior physics classroom.Title is: junior middle school's mechanics multifunctional is probed into, demonstrating experiment device.This device be in junior middle school's mechanics four important experiments integrate multi-functionally to probe into, demonstrating experiment device.The experiment can probe into, demonstrated has: 1, balance between two forces; 2, pulley (group) power, distance relation; 3, pulley (group) mechanical efficiency is surveyed; 4, (quantitatively) relation of spring force and elongation is studied.

Background technology

At present, what the experiment content teaching aid that this device is demonstrated generally adopted is four covering devices.Respectively:

1, the device (2001,2012 people teach device and the scheme all for this reason of the balance between two forces lecture experiment shown in version and Lu section version teaching material) of demonstration of balance between two forces:

One, experiment dolly, two ends respectively with a pulley be about 1 meter plank, fine rule and some hooks code composition.In experiment, research object is dolly, and dolly two ends respectively connect a fine rule, and two fine rules link up with code after walking around the pulley at two ends respectively again.The experimental program of this experimental provision: dynamically whether change to judge that whether dolly is by equilibrant with the motion of dolly.(1) whether equally study two power sizes: two power suffered by dolly are respectively the power that two end hook codes draw dolly, this power size is hook code gravity, and namely change hook code number changes the size to dolly two pulling force.Observe moving of car state whether to change to judge that whether dolly is by equilibrant, pushes away two power and whether balances.(2) study two power whether way be on the same line: discharge (discharging the first two power not on the same line) after dolly being reversed certain angle, observe dolly and whether rotate, thus judge now two force unbalances.(3) research direction on the contrary whether time, allow same number hook code be hung on two ends and one end respectively and demonstrate.(4), when two power of studying are same stressed thing, cannot directly demonstrate.

There is great design defect in this experimental design, be presented as: (1) friction force between dolly and plank cannot be avoided and comparatively large (particularly when being turned an angle by dolly), larger on the demonstrating effect impact of experiment; (2) dolly quality is comparatively large, and inertia is comparatively large, and under unbalanced force condition, motion state is malleable not, larger to experimental demonstration influential effect; (3) to one of condition of balance between two forces: two power on the same line demonstrating effect are not obvious; (4) one of balance between two forces: application point embodies not obvious on same object, does not have visual impact to student.

2, pulley (group) power, distance relation; Survey pulley (group) mechanical efficiency (because the existing experimental provision generally adopted is identical, therefore two experiments merge explanation)

Iron stand, pulley (group) and core degree chi scheme are the existing device that generally adopts and experimental program: hang on iron stand by pulley (group) assembling, vertical direction clamp a rule with iron clamp simultaneously.Use weight beam lifting heavy hook code again, start to test.But this device and scheme are not bery perfect, are unfavorable for Experimental Research.Be embodied as: the pulley blocks that the pulley of (1) movable and fixed pulley and same number forms can not contrast that to carry out testing (2) device stability poor simultaneously, and equip too little, be not easy to demonstration, reading is not very convenient.(3) device install, operation not very convenient.

3, (quantitatively) relation of spring force and elongation is studied.

Iron stand, spring and rule scheme are the existing experimental provision that generally adopts and scheme: hung on by spring on iron stand, vertical direction clamp a rule with iron clamp simultaneously.Hanged hook code under spring, starts to test again

But this device and scheme are not bery perfect, are unfavorable for Experimental Research.Be embodied as: (1) experimental program causes error comparatively large, is not easy to Rule Summary.(2) device stability is poor, equips too little, and be not easy to demonstration, reading is not very convenient.(3) contrast experiment and expansion is not easy to.

Summary of the invention

The very large design defect that these four experimental provisions carried out to overcome this four covers experimental provision existing exist in design and deficiency, the utility model provides that one junior middle school mechanics multifunctional is probed into, demonstrating experiment device, perfectly can solve former four cover experimental provision design defect and deficiencies, and some technical barriers can be solved, four covering devices are merged into the utility model set of device simultaneously.

The experimental provision that the utility model proposes, is made up of main element (Figure 14) and accessory.

part I is main element, comprises 4 kinds of assembly: 800mm × 600mm × 40mm lightweight composite plastic rectangle sheet material 1, foot rest 2, one265mm × 548mm × 2mm difunctional scaleplate 3, and three laboratory standard single-sheaved blocks 4.The location assembling mode of 4 kinds of assemblies refers to accompanying drawing 14, specific as follows: one isthe assembling of difunctional scaleplate 3 and rectangle sheet material 1 ,the set screw that difunctional scaleplate 3 is 2mm by internal diameter is fixed on sheet material 1, uses when studying spring and pulley or pulley blocks, reads the scale that the left side marks when wherein studying spring, reads the scale that the right marks when research pulley or pulley blocks; two arethe assembling of three laboratory standard single-sheaved blocks 4 and square sheet material 1 ,three laboratory standard single-sheaved blocks 4 adopt six set screws to screw each pulley two ends hook to be respectively fixed on sheet material 1, size positions is shown in accompanying drawing 14, wherein single-sheaved block 4 is positioned sheet material 1 by the set screw of two internal diameter 2mm and the nut of 6 internal diameter 2mm, to be separated by 2mm to realize single-sheaved block 4 and sheet material 1 by turn positioning screw cap, allow pulley 4 lower surface and difunctional scaleplate 3 upper surface just at grade; three arethe assembling of hook 5 and sheet material 1, hook 5 is clamped by the set screw of 1 internal diameter 2mm and the nut of two internal diameter 2mm, be fixed on sheet material 1 by the nut of 2 internal diameter 2mm again, the distance between hook 5 and sheet material 1, two setscrew nuts being clamped hook 5 by turn regulate; four aresheet material 1 is arranged two set screws 6, be convenient to the accessories such as the spring in expansion experiments are installed.

part II is accessory,comprise 7 types: the sett B that the sett A that the continuous line of soft matter that the hook code that specification is 50g, specification are diameter 0.5mm, specification are 200mm × 100mm × 1.5mm, specification are 200mm × 100mm × 1.5mm, former long 150mm elasticity coefficient are spring, the weight beam of 1N/cm .The kind of accessory according to probing into, the content of lecture experiment selects, the assembly and connection mode of accessory and main element, specific as follows: one is for carrying out balance between two forces lecture experiment,be the hook code of 50g by (Fig. 3) specification, (Fig. 4) specification is the continuous line of soft matter of diameter 0.5mm, sett B and the utility model main body ministerial level of the 200mm × 100mm × 1.5mm connected with transparent adhesive tape in the middle of the sett A of (Figure 10) 200mm × 100mm × 1.5mm or (Fig. 9) are connected (Figure of description illustrate in Figure 16 to Figure 19); two is for carrying out pulley (group) power and distance relation demonstration is tested,be the hook code of 50g by (Fig. 3) specification, (Fig. 4) specification is the continuous line of soft matter of diameter 0.5mm, standard single-sheaved block and weight beam and this applicable Novel main body component combine each parts afterwards and be connected (Figure of description illustrate in Figure 20) in laboratory; three is for pulley (group) mechanical efficiency carries out lecture experiment,be the hook code of 50g by (Fig. 3) specification, (Fig. 4) specification is the continuous line of soft matter of diameter 0.5mm, (Figure 12) laboratory standard single-sheaved block and (Figure 13) weight beam and the utility model main element combine each parts afterwards and be connected (Figure of description illustrate in Figure 21); four is for spring force and elongation relation demonstration are tested,be the hook code of 50g by (Fig. 3) specification, (Fig. 8) former long 150mm elasticity coefficient is that the spring of 1N/cm combines (Figure of description illustrate in Figure 22 to Figure 25) with this applicable Novel main body component.

this demonstrating experiment device, the unit type related to and number as follows: main element,containing 800mm × 600mm × 40mm lightweight composite plastic rectangle sheet material 1, foot rest 2, difunctional scaleplate 3 and (Fig. 1) packing ring, (Fig. 2) specification is the positioning screw cap of external diameter 7mm and internal diameter 2mm, (Fig. 5) specification is the accessory set screw nail of internal diameter 2mm, (Fig. 6) specification is the scaleplate set screw of long 50mm and diameter 2mm, (Figure 11) specification is the metal hanger of long 10mm and diameter 2mm, (Figure 12) standard single-sheaved block three in laboratory, is fixed on the sheet material 1 of main element with set screw, nut respectively ; Accessory,containing the continuous line of soft matter that (Fig. 4) specification is diameter 0.5mm, (Fig. 7) former long 60mm elasticity coefficient is the little spring of 0.5N/cm, (Fig. 8) former long 150mm elasticity coefficient is the big spring of 1N/cm, (Fig. 9) the sett B of 15g is no more than in the middle of by 200mm × 100mm × 1.5mm quality that transparent adhesive tape connects, (Figure 10) 200mm × 100mm × 1.5mm quality is no more than the sett A of 15g, (Figure 11) metal hanger, standard (Figure 12) single-sheaved block two in laboratory, (Figure 13) weight beam two.

After the utility model connects by above technical scheme, these four experiments can be merged into set of device and carry out probing into, demonstrating and technological merit of the present utility model can be shown, below divide four experiments to be described:

1, balance between two forces probe into, demo function (Figure of description illustrate in Figure 16 to Figure 19 show)

(1) experiment experiment of horizontal table top being changed into perpendicular of novelty, strengthens visibility greatly.

(2) can novelty solution balance between two forces in stressed thing be the difficulties in teaching that same object cannot directly be demonstrated.

(3) research object is no longer by the impact of friction force, and under nonequilibrium condition motion state malleable.

2, pulley (group) power, distance relation; Survey pulley (group) mechanical efficiency is probed into, demo function (in Figure of description explanation, Figure 20 to Figure 21 shows)

After changing this programme into by iron stand, pulley (group) and rule scheme, install, operation more simply, more intuitively, easier reading.Teacher can vividly explain by separating device.

(2) two operations can be carried out simultaneously, contrast two kinds of pulley (group) student Geng Yi and distinguish and knowledge is not obscured.

3, the probing into of (quantitatively) relation of spring force and elongation, demo function (Figure of description illustrate in Figure 22 to Figure 28 show) is studied

(1), after changing device of the present utility model, scheme into by iron stand, spring and rule scheme, more convenient operation, more directly perceived, convenient reading, teacher can vividly explain by separating device.

(2) the utility model is more easily studied the relational extensions of the qualitative understanding spring force in junior middle school and elongation to quantitative relationship, and student is easy to understand.

(3) the utility model can not only study spring force, but also the elastic threads such as such as bungee etc. can be replaced the relation of spring research elastic force and elongation, the thinking of expansion student.

(4) under the utility model can also study different spring force the same terms by control variate method, pairing comparision, elongation is different.If conditions permit, go back easily extensible and probe into relevant knowledges such as spring series and parallels.

The beneficial effects of the utility model are, this covering device well can not only complete balance between two forces, pulley (group) power and distance relation, survey pulley (group) mechanical efficiency and research spring force and (quantitatively) of elongation be related to these four test probe into, demonstration, and the very large design defect that existing experimental provision and scheme can be existed and deficiency obtain comparatively perfectly separating, novelty solve some difficulties in teaching, and visual impact is obvious, teaching difficulty is easily broken through, this cover junior middle school mechanics multifunctional is probed into, apparatus for demonstrating a set ofly meets very much a set of experimental provision of junior middle school student to physical mechanics cognitive law.

Accompanying drawing explanation

fig. 1 is the accessory packing ring figure that the utility model is used.

fig. 2 is the accessory positioning screw cap figure that the utility model is used.

fig. 3 is the accessory hook code figure that the utility model is used.

fig. 4 is thin, the soft continuous line chart of the accessory that the utility model is used.

fig. 5 is the accessory set screw nail figure that the utility model is used.

fig. 6 is the accessory scaleplate set screw figure that the utility model is used.

fig. 7 is the little spring figure that accessory elasticity coefficient that the utility model is used is less.

fig. 8 is the big spring figure that accessory elasticity coefficient that the utility model is used is larger.

fig. 9 is that the centre of joining that the utility model is used is schemed with the part sett B that transparent adhesive tape connects.

figure 10 is that the accessory sett A that the utility model is used schemes.

figure 11 is the accessory metal hanger figure that the utility model is used.

figure 12 is standard single-sheaved block figure in the utility model accessory laboratory of using.

figure 13 is the accessory weight beam figure that the utility model is used.

figure 14 is that the main element of the utility model (except accessory) faces engineering drawing.

figure 15 be the utility model (except accessory) main element on the left of look engineering drawing.

figure 16 is the utility model for exploded view during two balances in demonstration of balance between two forces.

figure 17 is the utility model for two power in demonstration of balance between two forces not at the uneven exploded view of same straight line.

figure 18 is that the utility model two power in demonstration of balance between two forces do not act on uneven exploded view on same object.

figure 19 is that the utility model is for the identical uneven exploded view of two force directions in demonstration of balance between two forces.

figure 20 is that the utility model is for demonstrating movable and fixed pulley feature and surveying movable and fixed pulley mechanical efficiency experiment effect exploded view.

figure 21 is that the utility model is for demonstrating pulley blocks feature and surveying pulley blocks mechanical efficiency experiment effect exploded view.

exploded view after pendulum spring when Figure 22 is the utility model for studying spring.

figure 23 be the utility model for studying spring time hang exploded view after a hook code.

figure 24 be the utility model for studying spring time hang exploded view after two hook codes.

figure 25 be the utility model for studying spring time hang exploded view after three hook codes.

to be the utility model only hang up exploded view after spring for studying different elasticity by identical tension spring elongation difference to Figure 26.

to be the utility model hang up exploded view after a hook code for studying different elasticity by identical tension spring elongation difference to Figure 27.

to be the utility model hang up exploded view after two hook codes for studying different elasticity by identical tension spring elongation difference to Figure 28.

Embodiment

Figure 14 shows the utility model main element.Comprise 800mm × 600mm × 40mm lightweight composite plastic rectangle sheet material 1 and foot rest 2.Wherein sheet material 1 contains four parts, following connection respectively: the difunctional scaleplate (using when research spring and pulley (group)) 3 of (1) 265mm × 548mm × 2mm, and the set screw being 2mm by internal diameter is fixed on sheet material 1, (2) employing six set screws are fixed on three laboratory standard single-sheaved blocks 4 on sheet material 1 by the position in this figure and orientation, and single-sheaved block 4 is positioned apart from sheet material 1 by the set screw of two internal diameter 2mm and the nut of six internal diameter 2mm, be achieved single-sheaved block (4) and sheet material (1) by turn positioning screw cap to be separated by 2mm, allow pulley 4 lower surface and difunctional scaleplate 3 upper surface just at grade, be convenient to balance between two forces, pulley (group) power and distance relation, survey pulley (group) mechanical efficiency and be related to that these four experiments do not interfere with each other with (quantitatively) of research spring force and elongation, (3) hook 5 is clamped by the set screw of an internal diameter 2mm and the nut of two internal diameter 2mm, be fixed on sheet material 1 by the nut of two internal diameter 2mm again, distance between hook 5 and sheet material 1, two nuts can clamping hook 5 by turn regulate, and are convenient to four different experimental implementation, (4) be convenient to other accessory of this device is installed and the set screw 6 arranged.

Figure 15 shows the utility model main element left side view.Reflection set screw 1, hook 2, be fixed on the laboratory standard single-sheaved block 3 on plank and be convenient to install set screw 4 and foot rest 5 assemble effect.

(quantitatively) that this combination of subassembly selection be suitable in Novel main body component and figure mono-well can complete balance between two forces, pulley (group) power, distance relation, survey pulley (group) mechanical efficiency after installing and study spring force and elongation be related to these four test probe into, demonstrate.These four experiment embodiment be:

1, the probing into of balance between two forces, demonstrate

Be the hook code of 50g by (Fig. 3) specification, (Fig. 4) specification be the continuous line of soft matter of diameter 0.5mm, the sett B of 200mm × 100mm × 1.5mm that sett A(or Fig. 9-centre that (Figure 10) 200mm × 100mm × 1.5mm quality is no more than 15g connects with transparent adhesive tape).After combining with the utility model main element (Figure 14), can complete the operation shown in Figure 16 to Figure 19, particular content is as follows:

(1) Figure 16 is sight photo when meeting balance between two forces (two power etc. are large, oppositely, conllinear, consubstantiality).

One of balance between two forces can be studied: two power equal and opposite in directions (changing both sides hook code number checking) shown in this figure

(2) Figure 16 and Figure 17 shows research balance between two forces two: two power on the same line.

(3) Figure 16 and Figure 18 shows that research balance between two forces three: two point of force application is on same object.

(4) Figure 16 and Figure 19 shows that research balance between two forces four: two force direction is contrary.

Research object when this experiment is done with the utility model in [operation indicating] (1) is sett wooden unit A(Figure 10 that small rectangle 200mm × 100mm × 1.5mm quality is no more than 15g) and B(Fig. 9).Wherein B(Fig. 9) be little rectangularly open the sett B that research object 200mm × 100mm × 1.5mm quality that plank is formed by connecting is no more than 15g with adhesive tape by two, adhesive tape is connector, is convenient to cut off.

(2) only have operation shown in Figure 18 to use small rectangle 200mm × 100mm × 1.5mm quality to be no more than the sett B of 15g, cut off connector with scissors as shown in figure 18----adhesive tape, counterevidence: two power must act on same object.

(3) the sett B(Fig. 9 of the rectangle 200mm × 100mm × 1.5mm to picture is studied carefully) reuse way: after first time, intermediate connector adhesive tape was cut off in experiment, stick with adhesive tape before second time uses B and get final product (adhesive tape is as connector).

2, pulley (group) power, the probing into of distance relation, demonstrate; Survey the probing into of pulley (group) mechanical efficiency, demonstrate:

(because 2,3 experiments utilize the utility model to assemble, assemble substantially identical with experimentation, therefore merge introduction.）

(1) distance relation of fixed and moving power, distance relation is studied and is surveyed mechanical efficiency:will (fig. 3) in the specification hook code that is 50g, (Fig. 4) specification continuous line of soft matter that is diameter 0.5mm, (Figure 12) laboratory standard single-sheaved block and (Figure 13) weight beam and the utility model main element (Figure 14) combine afterwards each parts connection for shown in (Figure 20), namely originally probe into, demonstrate scheme of installation, namely these function body parts of the utility model and each parts connection are shown.

(2) distance relation of two kinds of pulley blockss of same number pulley composition is studied and is surveyed mechanical efficiency:be the hook code of 50g by (Fig. 3) specification, (Fig. 4) specification is the continuous line of soft matter of diameter 0.5mm, after standard single-sheaved block and (Figure 13) weight beam and the utility model main element (Figure 14) combine in (Figure 12) laboratory, each parts connection is for shown in Figure 21, namely originally probe into, demonstrate scheme of installation, namely these function body parts of the utility model and each parts connection are shown.

When [operation indicating] 1, weight beam upwards pull, direction of pull keeps vertically as far as possible, to reduce experimental error.2, read hook code to be read during range of lift on the right side of scaleplate " grind (spy) and study carefully pulley (group) reading district"

3, spring force and elongation the probing into of (quantitatively) relation, demonstrate:

The experimental implementation as shown in Figure 22 to Figure 23 can be completed after the big spring that the hook code being 50g by (Fig. 3) specification and (Fig. 8) former long 150mm elasticity coefficient are 1N/cm and the utility model main element (Figure 14) combine, namely originally probe into, demonstrate, namely these function body parts of the utility model and each parts connection are shown.Wherein:

Figure 22 is that displaying directly reads spring former length when probing into.Figure 23 to Figure 25 is concrete research process schematic diagram, to the qualitative examination of junior physics Current Curriculum standard-required, namely studies " spring elongates amount is longer, and the elastic force of generation is larger ".

the utility model can also carry out patulous research (this part is also the utility model protection domain) to spring knowledge very easily:

Expansion one: to the qualitative examination of junior middle school's Current Curriculum standard-required, also can not only can easily carry out quantitative examination, namely " same spring, spring force is directly proportional to elongation " be studied.

Expansion two: by (Fig. 3), can complete different the probing into of elongation under different spring force the same terms after the big spring of the hook code of specification 50g, (Fig. 7) former long 60mm elasticity coefficient to be the former long 150mm elasticity coefficient of little spring (Fig. 8) of 0.5N/cm be 1N/cm combines from an applicable Novel main body component (Figure 14).Shown in Figure 26 to Figure 28.

Expansion three: the utility model is used for this experiment and can also extends to very easily the related laws such as spring series and parallel are probed into.

[operation indicating] 1, test before, first observe the utility model main element (shown in Figure 14, Figure 15)metal hook extreme lower position whether " grind (spy) and study carefully spring reading district" zero graduation position, if in this position, can start to hang spring immediately and start experiment; If no longer use this position, with clamp adjustment metal hook to " grind (spy) and study carefully spring reading district" zero graduation position, then start experiment.

2, read hook code to be read during range of lift on the left of scaleplate " grind (spy) and study carefully spring reading district "

Above-described is only preferred implementation of the present utility model; should be understood that for the person of ordinary skill of the art; under the prerequisite not departing from the utility model principle, can also make some distortion and improvement, these also should be considered as protection domain of the present utility model.

Claims (3)

1. junior middle school's mechanics multifunctional is probed into, demonstrating experiment device, its architectural feature is: this covering device, be made up of main element and accessory two parts, Part I is main element, comprise 800mm × 600mm × 40mm lightweight composite plastic rectangle sheet material (1) and foot rest (2), wherein sheet material (1) is fixed with three laboratory standard single-sheaved blocks (4) and one piece of these four vitals of difunctional scaleplate (3), connected mode is respectively: one is that the difunctional scaleplate (3) of 265mm × 548mm × 2mm uses when studying spring and pulley or oil tanker group, read when studying spring the scale that the left side marks, the scale that the right marks is read when research pulley or pulley blocks, and the set screw being 2mm by internal diameter is fixed on sheet material (1), two is employing six set screws, screw each pulley two ends respectively and link up with three laboratory standard single-sheaved blocks (4) of being fixed on sheet material (1), and single-sheaved block (4) is positioned sheet material (1) by the set screw of two internal diameter 2mm and the nut of six internal diameter 2mm, be achieved single-sheaved block (4) and sheet material (1) by turn positioning screw cap to be separated by 2mm, allow single-sheaved block (4) lower surface and difunctional scaleplate (3) upper surface just at grade, three is clamp hook (5) by the nut of the set screw of an internal diameter 2mm and two internal diameter 2mm, be fixed on sheet material (1) by the nut of two internal diameter 2mm again, distance between hook (5) and sheet material (1) can be clamped by turn two nuts of locating hook linking up with (5) and be regulated, four is be convenient to install other accessory of this device and two set screws 6 arranged, Part II is that accessory and reaching of main element join use, its connected mode is these four kinds respectively and reaches and join: one is be the hook code of 50g by specification, specification is the continuous line of soft matter of diameter 0.5mm, the sett B of 200mm × 100mm × 1.5mm that the sett A of 200mm × 100mm × 1.5mm or centre connect with transparent adhesive tape and the utility model main element combine, two is be the hook code of 50g by specification, specification is the continuous line of the soft matter of the continuous line of soft matter of diameter 0.5mm, in laboratory standard single-sheaved block and weight beam and the utility model main element combine after each parts be connected, three is be the hook code of 50g by specification, specification is the continuous line of soft matter of diameter 0.5mm, in laboratory standard single-sheaved block and weight beam and the utility model main element combine after each parts be connected, four is be the hook code of 50g by specification, former long 150mm elasticity coefficient is that the spring of 1N/cm and the utility model main element combine.

2. mechanics multifunctional is probed in junior middle school according to claim 1, demonstrating experiment device, it is characterized in that, main element is formed by following assembling parts: comprise 800mm × 600mm × 40mm lightweight composite plastic rectangle sheet material (1), foot rest (2), scaleplate (3) and packing ring, specification is the positioning screw cap of external diameter 7mm and internal diameter 2mm, specification is the accessory set screw nail of internal diameter 2mm, specification is the scaleplate set screw of long 50mm and diameter 2mm, specification is the metal hanger of long 10mm and diameter 2mm, standard single-sheaved block three in laboratory, use set screw respectively, nut is fixed on the sheet material (1) of main element.

3. junior middle school according to claim 1 mechanics multifunctional probe into, demonstrating experiment device, it is characterized in that, accessory has: specification is the continuous line of soft matter of diameter 0.5mm, former long 60mm elasticity coefficient is the little spring of 0.5N/cm, former long 150mm elasticity coefficient is the big spring of 1N/cm, the middle sett B being no more than 15g by 200mm × 100mm × 1.5mm quality that transparent adhesive tape connects, 200mm × 100mm × 1.5mm quality is no more than the sett A of 15g, metal hanger, standard single-sheaved block two in laboratory, weight beam two.