CN203858788U - Newton second law probe experimental instrument - Google Patents
Newton second law probe experimental instrument Download PDFInfo
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- CN203858788U CN203858788U CN201420280337.8U CN201420280337U CN203858788U CN 203858788 U CN203858788 U CN 203858788U CN 201420280337 U CN201420280337 U CN 201420280337U CN 203858788 U CN203858788 U CN 203858788U
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- 239000000523 sample Substances 0.000 title abstract description 9
- 238000002474 experimental method Methods 0.000 claims abstract description 43
- 238000006073 displacement reaction Methods 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229920001971 elastomer Polymers 0.000 claims description 8
- 239000005060 rubber Substances 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 description 20
- 238000012360 testing method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 230000005484 gravity Effects 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
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Abstract
The utility model provides a Newton second law probe experimental instrument. The instrument comprises a track, a car moving in the direction of the length of the track, a main controller, a time control device, a brake device, an electromagnet and a power supply. The electromagnet is used for driving the brake device to move. The main controller is separately connected to the time control device, the electromagnet and the power supply. The front part of the car is provided with a first rope, and the back part of the car is provided with a second rope. The end part of the first rope is fixed with a first counterweight that is in a vertical hanging state. The second rope that is in a stretched state passes through the brake device. The upper end surface of the car is provided with a second counterweight. With the experimental instrument, the relationship among a pulling force, the weight of the car, and the moving distance of the car is well observed. The moving time of the car in a plurality of experiments is ensured to be equal, so that moving time is a fixed amount. Thus, the accuracy of the experiment results is ensured.
Description
Technical field
The utility model relates to a kind of physics teaching experiment equipment, particularly relates to a kind of Newton second law and probes into experiment instrument.
Background technology
Newton second law is newton's second law of motion, and the acting force that the size that refers to object acceleration is subject to object is directly proportional, and is inversely proportional to the quality of object, the direction of acceleration is identical with the direction of bonding force, i.e. F=ma, and F is the power that object is subject to, m is mass of object, the acceleration that a is object.Newton second law, as the bridge of kinematics and mechanics, is dynamic (dynamical) core rule, is the dynamic (dynamical) basis of research, occupies very important status in the Physics Learning of senior high school period.Therefore, by one successfully experiment to allow student probe into acceleration, quality, the stressed triangular relation of object be an extremely important link in Newton second law teaching process.At present, mainly there is following drawback for the experimental provision of probing into Newton second law:
1, traditional experiment device:
Mode one: adopt dotted timer, in the situation that repeatedly measuring, need to repeatedly change paper tape and test, therefore operate complicated, time-consuming;
Mode two: adopt double track experimental provision, owing to not controlling time of the each motion of dolly all identical, therefore can not take multiple measurements, thereby cause experiment can not reflect well Newton second law;
Mode three: air track and dotted timer mode are similar, have just reduced the frictional resistance between slide block and dolly;
2, between paper tape and spacing hole, there is friction, can produce undoubtedly more error, the accuracy of impact experiment;
3, comparatively difficulty of the calculating of experimental data, waste time in classroom;
4, three kinds of mode equipment used are more, and inconvenient operation, particularly moving object braking difficulty are the maximum operating difficulties of experiment;
5, experiment is difficult for successfully, at the greatly lower classroom efficiency that reduces of easily failed situation.
Utility model content
The defect of prior art and various weak point in view of the above, the technical problems to be solved in the utility model be to provide a kind of can ensure to test time at every turn moving of car time all consistent Newton second law probe into experiment instrument.
For achieving the above object, the utility model provides a kind of Newton second law to probe into experiment instrument, comprise track and the dolly that can move along track length direction, also comprise master controller, time-controlling arrangement, clamping device, electromagnet and power supply, described electromagnet is used for driving clamping device action, and described master controller is connected with time-controlling arrangement, electromagnet and power supply respectively; The front end of described dolly is provided with the first stay cord, and rear end is provided with the second stay cord, and the end of described the first stay cord is fixed with the first balancing weight, and this first balancing weight is in vertical suspension status; Described the second stay cord is located in clamping device, and the second stay cord is in exceptionally straight state; The upper surface of described dolly is provided with the second balancing weight.
Further, also comprise a horizontal stand, the front end of described track is provided with support unit, and rear end is provided with a control box, and described track is bearing on horizontal stand by support unit and control box; Described master controller, clamping device, electromagnet are fixed in control box, and described time-controlling arrangement is fixed on the upper surface of control box.
Preferably, described time-controlling arrangement comprises housing, is located at the control chip in housing, the outer wall of described housing is provided with electronic display, timing button, state display lamp and start button, and described electronic display, timing button, state display lamp and start button are all connected with control chip.
Further, described clamping device comprises connecting rod, lower link and the upper brake block being oppositely arranged and lower brake block, on the upper surface of the lower surface of described upper brake block and lower brake block, be all fixed with sheet rubber, described the second stay cord is between two sheet rubbers; Described upper connecting rod and upper brake block are fixed on the inwall of control box, and described lower link is located in the iron core and lower brake block of electromagnet, is provided with two springs between the two ends of described upper connecting rod and the two ends of lower link; In the time that electromagnet is switched on, upper brake block and lower brake block are separated, and described spring is stretched; In the time of electromagnet power-off, the elastic force of spring drives lower brake block to move up, and upper brake block and lower brake block fit.
Preferably, also comprise that one is positioned at the spacing ring of front side, brake block lower end, this spacing ring is fixed on the inwall of control box, and described the second stay cord is located in this spacing ring.
Preferably, also comprise that one is vertically located in control box and ejector return pin moving up and down, the upper end of this ejector return pin is fixed with a reset button that is positioned at control box outside, and lower end abutment is on the iron core of electromagnet.
Further, described support unit comprises back-up block, two nuts and two screw rods, the left and right sides of described back-up block is equipped with a liner plate, two screw rods be located in respectively in two blocks of liner plates and with liner plate threaded engagement, two nuts are separately fixed at the upper end of two screw rods.
Further, the front end of described track is provided with a pulley, and described the first stay cord is walked around from the upper surface of this pulley.
Preferably, the sidewall of described track is provided with zero graduation and scale mark, and described scale mark is for representing the displacement of dolly.
Preferably, described track has and only has one.
The Newton second law that the utility model relates to is probed into experiment instrument and is had following beneficial effect:
This experiment instrument can be observed the relation between pulling force, dolly weight, dolly displacement three well, therefore can provide a displaying directly perceived about Newton second law for student, thereby be convenient to student and grasp better and understand the principle of Newton second law, in addition, this experiment instrument is in the time carrying out many experiments, the time that can ensure to test each time time, dolly moves all equates, traveling time is a fixed amount, thereby ensures the accuracy of experimental result.
Above-mentioned explanation is only the general introduction of technical solutions of the utility model, in order to better understand technological means of the present utility model, and can be implemented according to the content of instructions, below with preferred embodiment of the present utility model and coordinate accompanying drawing to be elaborated to this patent.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the side view of Fig. 1.
Fig. 3 is the structural representation of time-controlling arrangement in the utility model.
Fig. 4 is the structural representation of clamping device in the utility model.
Fig. 5 is the structural representation of support unit in the utility model.
Fig. 6 is the A circle enlarged drawing of Fig. 4.
Element numbers explanation
1 track
2 dollies
3 time-controlling arrangements
31 housings
32 electronic displays
33 timing buttons
34 state display lamps
35 start buttons
4 electromagnet
41 iron cores
5 clamping device
Connecting rod on 51
52 lower links
Brake block on 53
54 times brake blocks
55 sheet rubbers
56 springs
57 spacing rings
58 ejector return pins
59 reset button
6 first stay cords
7 second stay cords
8 first balancing weights
9 second balancing weights
10 horizontal stands
11 support units
111 back-up blocks
112 nuts
113 screw rods
114 liner plates
12 control boxs
13 pulleys
14 scale marks
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described in detail.
Newton second law is F=ma, therefore Newton second law research experiment instrument is mainly the relation of probing between the tensile force f three that acceleration a, dolly quality m and dolly be subject to; In addition, by
known, under certain prerequisite of time, the acceleration a of dolly is directly proportional to the displacement S of dolly.Therefore the tensile force f three's that can be subject to by dolly displacement S, dolly quality m and dolly relation is probed into Newton second law, tensile force f one timing being subject to when dolly, if dolly quality m and dolly displacement S are inversely proportional to, illustrate that the acceleration a of dolly quality m and dolly is inversely proportional to; In like manner, when dolly quality m mono-timing, if the tensile force f that dolly displacement S is subject to dolly is directly proportional, illustrate that the acceleration a of dolly is directly proportional to tensile force f.
For this reason, the time of experiment is at every turn made as a fixed value by the application, experimental period is quantized, as depicted in figs. 1 and 2, the utility model provides the Newton second law relating to probe into experiment instrument to comprise track 1 and the dolly 2 that can move along track 1 length direction, also comprise master controller, time-controlling arrangement 3, clamping device 5, electromagnet 4 and power supply, described electromagnet 4 is for driving clamping device 5 to move, and described master controller is connected with power supply with time-controlling arrangement 3, electromagnet 4 respectively; The front end of described dolly 2 is provided with the first stay cord 6, and rear end is provided with the second stay cord 7, and the end of described the first stay cord 6 is fixed with the first balancing weight 8, and this first balancing weight 8 is in vertical suspension status; Described the second stay cord 7 is located in clamping device 5, and the second stay cord 7 is in exceptionally straight state; The upper surface of described dolly 2 is provided with the second balancing weight 9.
This experiment instrument is in the time probing into Newton second law, and described the first balancing weight 8 is in vertical suspension status, therefore the first balancing weight 8 provides tensile force f by the first stay cord 6 for dolly 2, the second balancing weight 9 is placed on the upper surface of dolly 2, thereby for dolly 2 provides quality m, therefore can change tensile force f and quality m by changing the weight of the first balancing weight 8 and the second balancing weight 9, simultaneously, described time-controlling arrangement 3 is for setting the traveling time of each dolly 2, traveling time reaches after setting value, master controller drive magnetic 4 moves, thereby drive clamping device 5 to move, dolly 2 is stopped mobile, thereby realize synchronizeing of clamping device 5 and time-controlling arrangement 3, ensure that each mobile time of dolly 2 is all consistent, and then provide scientific basis for the drawing of experiment conclusion of Newton second law, so that student probes into dolly 2 displacement S, relation between the tensile force f three that dolly 2 quality m and dolly 2 are subject to, so that understand better more intuitively, grasp the principle of Newton second law.Preferably, described track 1 has and only has one, to simplify experiment instrument, makes more convenient to operate.
In addition, in the present embodiment, described the first balancing weight 8 and the second balancing weight 9 are counterweight, and the counterweight that the first balancing weight 8 is multiple 10g, the counterweight that the second balancing weight 9 is multiple 200g, and in order to prevent that dolly 2 second balancing weight 9 in moving process from shaking, therefore be provided with multiple grooves on the end face of dolly 2, the lower end of described the second balancing weight 9 is placed in groove.The front-end and back-end of described dolly 2 are equipped with a link, and described the first stay cord 6 is connected with the rear end of dolly 2 with the front end of dolly 2 by link respectively with the second stay cord 7.
Further, as shown in Figure 1, also comprise a horizontal stand 10, the front end of described track 1 is provided with support unit 11, and rear end is provided with a control box 12, and described track 1 is bearing on horizontal stand 10 by support unit 11 and control box 12; Described master controller, clamping device 5, electromagnet 4 are fixed in control box 12, and described time-controlling arrangement 3 is fixed on the upper surface of control box 12, and described the first balancing weight 8 is positioned at the front side of horizontal stand 10.Described support unit 11 and controller be the rear and front end of supporting track 1 respectively, and track 1 and horizontal stand 10 are separated, and ensures normally advancing of dolly 2.Preferably, the front end of described track 1 is provided with a pulley 13, and described the first stay cord 6 is walked around from the upper surface of this pulley 13, and the friction while moving to reduce the first stay cord 6, so that dolly 2 moves is more steady.
Preferably, as shown in Figure 1 and Figure 5, described support unit 11 comprises back-up block 111, two nuts 112 and two screw rods 113, the left and right sides of described back-up block 111 is equipped with a liner plate 114, two screw rods 113 be located in respectively in two blocks of liner plates 114 and with liner plate 114 threaded engagement, two nuts 112 are separately fixed at the upper end of two screw rods 113.Height by the adjustable screw rod 113 of rotating nut 112 in liner plate 114 lower ends, thereby the height of adjustable whole support unit 11, it is the angle of inclination of adjustable track 1, until the weight balancing of dolly 2 falls the kinetic force of friction of dolly 2 in moving process and between track 1, thereby 2, strict guarantee dolly does forward uniformly accelrated rectilinear motion under the effect of tensile force f, ensure the accuracy of Newton second law experimental result.
Preferably, see Fig. 3, described time-controlling arrangement 3 comprises housing 31, is located at the control chip in housing 31, the outer wall of described housing 31 is provided with electronic display 32, timing button 33, state display lamp 34 and start button 35, and described electronic display 32, timing button 33, state display lamp 34 and start button 35 are all connected with control chip.Shown in electronic display 32 for showing the set time etc.; Shown in timing button 33 comprise that the time increases " ▲ " key and time decreased
key, the time of pressing increases " ▲ " key for increasing the control time, presses time decreased
key is for reducing the control time; Described state display lamp 34 comprises run indicator and stop pilot lamp, for the working condition of displaying time control device 3, in the time that run indicator is bright, represents that time-controlling arrangement 3 is in work, when stopping pilot lamp when bright, represents that time controller do not work; Described start button 35 is started working for driving time control device 3.Therefore the time-controlling arrangement 3 in the application adopts singlechip controller, can regulate arbitrarily according to the length of track 1 length in control time, regulate the traveling time of dolly 2, as time t is adjusted to 1 second, 2 seconds etc., accurately and reliably, effectively improve the accuracy of experimental result; And after each adjusting,, without resetting the control time, time-controlling arrangement 3 can automatically reset, and therefore can carry out easily experimental implementation next time.
Further, as shown in Figure 4 and Figure 6, described clamping device 5 comprises connecting rod 51, lower link 52 and the upper brake block 53 being oppositely arranged and lower brake block 54, on the upper surface of the lower surface of described upper brake block 53 and lower brake block 54, be all fixed with sheet rubber 55, described the second stay cord 7 is between two sheet rubbers 55; Described upper connecting rod 51 and upper brake block 53 are fixed on the inwall of control box 12, and described lower link 52 is located in the iron core 41 and lower brake block 54 of electromagnet 4, between the two ends of described upper connecting rod 51 and the two ends of lower link 52, is provided with two springs 56.In the time that electromagnet 4 is switched on, the iron core 41 of electromagnet 4 drives lower brake block 54 to move down, thereby brake block 53 and lower brake block 54 are separated, and described spring 56 is stretched, and now dolly 2 is the state of motion; Reach after preset value when the control time, main control control electromagnet 4 power-off, now, the elastic force of spring 56 drives lower brake block 54 to move up, thus upper brake block 53 and lower brake block 54 fit, thereby by the second stay cord 7 fixed clamp between two sheet rubbers 55, with braking dolly 2, dolly 2 is stopped mobile, therefore these clamping device 5 brake tests are very easy, thereby Enhancement test is handling.
Preferably, see Fig. 4, also comprise that one is positioned at the spacing ring 57 of brake block 53 front sides, lower end, this spacing ring 57 is fixed on the inwall of control box 12, and described the second stay cord 7 is located in this spacing ring 57, to ensure that the second stay cord 7 moves within the limits prescribed.
Preferably, also comprise that one is vertically located in control box 12 and ejector return pin moving up and down 58, the upper end of this ejector return pin 58 is fixed with a reset button 59 that is positioned at control box 12 outsides, and lower end abutment is on the iron core 41 of electromagnet 4.The sidewall of described track 1 is provided with zero graduation and scale mark 14, and described scale mark 14 is for representing the displacement of dolly 2.After once experiment finishes, press reset button 59, ejector return pin 58 moves down under the effect of pressure, thereby force the iron core 41 of electromagnet 4 to move down together with lower brake block 54, now can be directly by pulling the second stay cord 7 that dolly 2 is returned to zero graduation line place, so that the carrying out of experiment next time; Dolly 2 is reset to after zero graduation line, unclamps reset button 59, can directly test next time, easy to operate quick.
The operation steps that this Newton second law is probed into experiment instrument is as follows:
1, equipment is placed on horizontal stand 10 to setting nut 112, the friction force that balancing trolley 2 is subject on track 1;
2, pin reset button 59, pull the second stay cord 7 of control box 12 outsides, make dolly 2 get back to the zero graduation line place of track 1, discharge reset button 59;
3, hang up 1 little hook code 10g in the end of the first stay cord 6, for dolly 2 provides certain tensile force f;
4, press and discharge start button 35;
5, record the displacement S that dolly 2 moves;
6, repeating step 2,3,4,5, surveys the mean value of getting S for four times.
7, change tensile force f with control variate method, change the number of hanging little hook code; Or change dolly 2 gross mass m, and on dolly 2, put 1 of 200 grams of hook code or 2, to probe into experiment, and record corresponding data, until complete experiment.
In aforesaid operations step, it is 1 second that time-controlling arrangement 3 will be made as in the control time, also can adjust as required the control time.
Experimental result is as follows:
One, dolly 2 quality remain unchanged, and the number that changes hanged hook code changes the suffered external force of dolly 2, hang up respectively 1,2,3 of the hook codes of 10g, measure every kind of situation of displacement S that dolly 2 passes through and do 4 times, and record data as shown in Table 1.
M=200g, t=1s, acceleration of gravity is 10N/Kg
Table one:
The constant 2F of number (hanging 2 little hook codes) of the constant hanged hook code of pulling force that two, dolly 2 is subject to, on dolly 2, add respectively that counterweight changes the gross mass dolly 2 of dolly 2 and the gross mass being added after counterweight is respectively 200g, 400g, 600g, measure every kind of situation of displacement S that dolly 2 passes through and do 4 record data as shown in Table 2
Pulling force is 2F, t=1s, and acceleration of gravity is 10N/Kg
Table two:
Analysis of experimental data is as follows:
As shown in Table 1:
In the time that m=200g, t=1s, acceleration of gravity are 10N/Kg, by Acceleration Formula
, calculate:
In the time that pulling force is F, a=0.39N/s
2;
In the time that pulling force is 2F, a=0.78N/s
2, F increases 2 times, and acceleration also increases 2 times in error range;
In the time that pulling force is 3F, a=1.16N/s
2, F increases 3 times, and acceleration also increases 3 times in error range;
Conclusion: when quality m mono-timing, tensile force f is directly proportional to acceleration a.
As shown in Table 2:
When pulling force is that 2F, t=1s, acceleration of gravity are while being 10N/Kg, by Acceleration Formula
,
calculate:
When m=0.2Kg, a=0.78N/s
2;
When m=0.4Kg, a=0.40N/s
2, when m increases 2 times, acceleration increases
doubly in error range;
When m=0.6Kg, a=0.24N/s
2, m increases 3 times, and acceleration increases
doubly in error range;
Conclusion: when tensile force f one timing, quality m and acceleration a are inversely proportional to.
In sum, the utlity model has following beneficial effect:
1, experimental implementation draws experiment conclusion simply, easily and fast, greatly improves classroom efficiency;
2, experiment equipment is few, overcomes the deficiency of traditional means of experiment, and computation process is simple;
3, adopt time-controlling arrangement, the methods such as the mean value of displacement calculating, reduce to test error;
4, being applicable to classroom instruction demonstration and student experiment in group uses;
5, cost is low, and precision is high, and appearance design is reasonable, can spread.
So the utility model has effectively overcome various shortcoming of the prior art and tool high industrial utilization.
A kind of Newton second law above the utility model embodiment being provided is probed into experiment instrument and is described in detail; for one of ordinary skill in the art; according to the thought of the utility model embodiment; all will change in specific embodiments and applications; in sum; this description should not be construed as restriction of the present utility model, and all any changes of making according to the utility model design philosophy are all within protection domain of the present utility model.
Claims (10)
1. a Newton second law is probed into experiment instrument, comprise track (1) and the dolly (2) that can move along track (1) length direction, it is characterized in that: also comprise master controller, time-controlling arrangement (3), clamping device (5), electromagnet (4) and power supply, described electromagnet (4) is for driving clamping device (5) action, and described master controller is connected with power supply with time-controlling arrangement (3), electromagnet (4) respectively; The front end of described dolly (2) is provided with the first stay cord (6), rear end is provided with the second stay cord (7), the end of described the first stay cord (6) is fixed with the first balancing weight (8), and this first balancing weight (8) is in vertical suspension status; Described the second stay cord (7) is located in clamping device (5), and the second stay cord (7) is in exceptionally straight state; The upper surface of described dolly (2) is provided with the second balancing weight (9).
2. Newton second law according to claim 1 is probed into experiment instrument, it is characterized in that: also comprise a horizontal stand (10), the front end of described track (1) is provided with support unit (11), rear end is provided with a control box (12), and described track (1) is bearing on horizontal stand (10) by support unit (11) and control box (12); Described master controller, clamping device (5), electromagnet (4) are fixed in control box (12), and described time-controlling arrangement (3) is fixed on the upper surface of control box (12).
3. Newton second law according to claim 1 and 2 is probed into experiment instrument, it is characterized in that: described time-controlling arrangement (3) comprises housing (31), is located at the control chip in housing (31), the outer wall of described housing (31) is provided with electronic display (32), timing button (33), state display lamp (34) and start button (35), and described electronic display (32), timing button (33), state display lamp (34) and start button (35) are all connected with control chip.
4. Newton second law according to claim 2 is probed into experiment instrument, it is characterized in that: described clamping device (5) comprises connecting rod (51), lower link (52) and the upper brake block (53) being oppositely arranged and lower brake block (54), on the upper surface of the lower surface of described upper brake block (53) and lower brake block (54), be all fixed with sheet rubber (55), described the second stay cord (7) is positioned between two sheet rubbers (55); Described upper connecting rod (51) and upper brake block (53) are fixed on the inwall of control box (12), described lower link (52) is located in the iron core (41) and lower brake block (54) of electromagnet (4), between the two ends of described upper connecting rod (51) and the two ends of lower link (52), is provided with two springs (56); In the time that electromagnet (4) is switched on, upper brake block (53) and lower brake block (54) are separated, and described spring (56) is stretched; In the time of electromagnet (4) power-off, the elastic force of spring (56) drives lower brake block (54) to move up, and upper brake block (53) and lower brake block (54) fit.
5. Newton second law according to claim 4 is probed into experiment instrument, it is characterized in that; Also comprise that one is positioned at the spacing ring (57) of brake block (53) front side, lower end, this spacing ring (57) is fixed on the inwall of control box (12), and described the second stay cord (7) is located in this spacing ring (57).
6. Newton second law according to claim 4 is probed into experiment instrument, it is characterized in that: also comprise that one is vertically located in control box (12) and ejector return pin moving up and down (58), the upper end of this ejector return pin (58) is fixed with one and is positioned at the outside reset button (59) of control box (12), and lower end abutment is on the iron core (41) of electromagnet (4).
7. Newton second law according to claim 2 is probed into experiment instrument, it is characterized in that: described support unit (11) comprises back-up block (111), two nuts (112) and two screw rods (113), the left and right sides of described back-up block (111) is equipped with a liner plate (114), two screw rods (113) be located in respectively in two blocks of liner plates (114) and with liner plate (114) threaded engagement, two nuts (112) are separately fixed at the upper end of two screw rods (113).
8. Newton second law according to claim 1 is probed into experiment instrument, it is characterized in that: the front end of described track (1) is provided with a pulley (13), described the first stay cord (6) is walked around from the upper surface of this pulley (13).
9. Newton second law according to claim 1 is probed into experiment instrument, it is characterized in that: the sidewall of described track (1) is provided with zero graduation and scale mark (14), and described scale mark (14) is for representing the displacement of dolly (2).
10. Newton second law according to claim 1 is probed into experiment instrument, it is characterized in that: described track (1) has and only have one.
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| CN106297519B (en) * | 2016-08-24 | 2019-02-22 | 合肥凌翔信息科技有限公司 | A kind of inclined-plane teaching experiment trolley remote control device |
| CN106370200A (en) * | 2016-10-11 | 2017-02-01 | 张远程 | Motion parameter measurement device of car |
| CN106370200B (en) * | 2016-10-11 | 2023-08-15 | 南京南华航空产业有限公司 | Motion parameter measuring device of vehicle |
| CN106422363A (en) * | 2016-11-24 | 2017-02-22 | 顾登慧 | Teaching educational toy in accord with Newton's second law |
| RU2773439C1 (en) * | 2021-05-05 | 2022-06-03 | Федеральное государственное бюджетное учреждение "Арктический и Антарктический научно-исследовательский институт" (ФГБУ "ААНИИ") | Stand for simulating low-frequency horizontal oscillations of ice |
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