CN108847096A - A kind of free fall experimental device - Google Patents

A kind of free fall experimental device Download PDF

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Publication number
CN108847096A
CN108847096A CN201810802548.6A CN201810802548A CN108847096A CN 108847096 A CN108847096 A CN 108847096A CN 201810802548 A CN201810802548 A CN 201810802548A CN 108847096 A CN108847096 A CN 108847096A
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CN
China
Prior art keywords
motor
installation base
block
pipe
newton
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Granted
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CN201810802548.6A
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Chinese (zh)
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CN108847096B (en
Inventor
薛军
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Foshan Ke Feng Culture Communication Co Ltd
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Foshan Ke Feng Culture Communication Co Ltd
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Priority to CN201810802548.6A priority Critical patent/CN108847096B/en
Publication of CN108847096A publication Critical patent/CN108847096A/en
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09BEDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B23/00Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
    • G09B23/06Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
    • G09B23/08Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
    • G09B23/10Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies

Abstract

The invention discloses a kind of free fall experimental devices,Including experimental provision ontology,Experimental provision ontology includes motor installation base,Top mounting base,Arc positioning ring,Support rod,Newton pipe,Vacuum pump,Motor,Speed reducer and electric motor,Motor installation base,There are four supporting legs for lower end fixed installation,Four supporting legs are divided into two groups of two sides positions for being respectively and fixedly installed to motor installation base lower end surface,The present invention relates to a kind of free fall experimental devices,First,The present invention is equipped with contact induction device probe in the bottom of newton pipe,It is popped one's head in by contact induction device and is contacted with iron plate and feather,Transmit a signal to electronic timer,The accuracy of experiment is high,Secondly,The present invention is provided with partition in the middle part of newton pipe,So that iron plate and feather do not interfere mutually,Reduce the uncertain factor of experiment,It is rotated simultaneously by driving motor and realizes newton pipe straight up,Further reduce the uncertain factor of experiment,Reduce error.

Description

A kind of free fall experimental device
Technical field
The present invention relates to educational facilities technical field, specially a kind of free fall experimental device.
Background technique
The movement of falling object is always the popular experiment of physical study personnel research, traditional free fall experimental device knot Structure simply has the following disadvantages:
Firstly, lower reduction of speed of the observation structure of traditional experiment with falling objects only by eye-observation iron plate and feather Degree, accuracy need to be investigated.
Secondly, traditional experiment with falling objects operating process interference experiment factor is more, such as made by experimenter Newton pipe guarantees that 90 degree do not know more vertically, do not have demarcation plate, iron plate and feather in the mistake of decline inside traditional newton pipe It is easy to interfere with each other in journey, causes the inaccuracy of experiment.
Summary of the invention:
The object of the invention is that providing a kind of free fall experimental device to solve the above-mentioned problems, solve existing The low problem of some experiment with falling objects accuracy.
To solve the above-mentioned problems, the present invention provides a kind of technical solutions:A kind of free fall experimental device, including reality Experiment device ontology, the experimental provision ontology include motor installation base, top mounting base, arc positioning ring, support rod, newton Pipe, vacuum pump, motor, speed reducer and electric motor, the motor installation base, lower end are fixedly mounted there are four supporting leg, and four The supporting leg is divided into two groups of two sides positions for being respectively and fixedly installed to motor installation base lower end surface, the motor installation base Two sides are fixedly installed with a handle, and two handles are distributed about motor installation base longitudinal centre line axial symmetry, institute State motor installation base upper end and be fixedly installed with top mounting base, top mounting base upper surface is cambered design, it is described on Two port positions on portion mounting base top are fixedly installed with arc positioning ring, and the internal diameter of the arc positioning ring is pacified equal to top The internal diameter of seat upper surface is filled, the top mounting base upper end center position is fixedly installed with support rod, the post upper one Side is fixedly connected with rotating block, and the rotating block side is equipped with fixed block, in one middle side part of rotating block and fixed block side It is rotatablely connected between portion by shaft, the fixed block both ends are fixedly installed with sleeve, the fixed peace of one middle side part of fixed block Equipped with hinge, two turning end of the hinge are fixedly connected to internal fixed ring, and two described internal fixed ring one end are equal It is fixedly connected with adjusting block.
Preferably, being equipped with threaded hole in the middle part of two adjusting blocks, the adjusting block upper end is equipped with bolt, two institutes It states adjusting block to connect by threaded hole with bolt thread, is arranged with newton pipe, the newton in the middle part of two internal fixed rings It is fixedly installed with partition in the middle part of pipe, newton pipe one end sets that there are two feeding ports, and two feeding port bores are identical, and two The feeding port outer surface is equipped with internal thread groove, and two feeding port sides are equipped with threaded cap, and the threaded cap passes through interior Thread groove is threadedly coupled with corresponding feeding port respectively, is fixedly connected with sliding in the middle part of the end face where two feeding ports Bar, the newton pipe other end are fixedly connected there are two follower lever, and two follower levers are about the end face center of circle where the two Position axis is symmetrical, and the sliding bar and two follower lever one end are fixedly installed with sliding part, and the arc positioning ring is set There is inside groove, the sliding part width is equal to the width of arc positioning ring inside groove, and the sliding bar and two follower levers pass through cunning Moving part and inside groove are slidably connected with arc positioning ring, and ventilative gear is fixedly mounted close to two follower lever sides inside the newton pipe Plate, the partition upper end are equipped with sheet metal, and the newton bottom of the tube of the partition side is equipped with feather.
Preferably, two gas permeable barrier surfaces are popped one's head in equipped with contact induction device, newton pipe two sides are fixed Contact induction device is installed, electronic timer, the motor installation are fixedly installed in the cambered surface where two contact induction devices Pedestal upper surface is fixedly installed with vacuum pump, and vacuum pump lower end side is equipped with exhaust outlet, the vacuum pump upper input It is connected with air inlet pipe, the air inlet pipe passes through arc positioning ring outer wall, and the motor installation base side is equipped with several thermovents, Several thermovents are equidistantly distributed in the motor installation base side at place, solid in the motor installation base internal backplane Dingan County is equipped with pedestal, and the pedestal upper end is fixedly installed with motor and speed reducer, and the motor output end passes through drive shaft and subtracts Fast machine input terminal rotation connection, the output end of reducer are rotatably connected to driving shaft, and described driving shaft one end is fixedly installed with Block, is equipped with belt between the driving shaft and shaft, the driving shaft is connect by belt with rotating shaft transmission.
Preferably, being fixedly installed with electric motor, the electric motor on the motor installation base interior side wall Output end is rotatably connected to driving lever, and shield is fixedly installed on the panel where the electric motor, and the shield leans on Nearly motor installation base side is fixedly installed with spill spin block.
Preferably, described driving lever one end and spill spin block are rotatablely connected, mounting ring is set in the middle part of the driving lever.
Preferably, being fixedly installed with flabellum on the outside of the mounting ring.
Preferably, being fixedly mounted on the inner wall of newton pipe one end, there are two spring block, the newton pipe Single port positions Vacuum tube is installed.
Preferably, the vacuum tube two sides are fixedly installed with link block, two link blocks and corresponding spring block Between pass through spring connect.
The beneficial effects of the invention are as follows:The present invention relates to a kind of free fall experimental devices, have experiment accuracy excessively high The characteristics of, in specific experimentation, the present invention has the advantages that:
Firstly, the present invention is equipped with contact induction device probe in the bottom of newton pipe, popped one's head in by contact induction device and iron Piece and feather contact, transmit a signal to electronic timer, and the accuracy of experiment is high.
Secondly, the present invention is provided with partition in the middle part of newton pipe, so that iron plate and feather do not interfere mutually, experiment is reduced Uncertain factor, while being rotated by driving motor and realizing newton pipe straight up, further reduce the uncertain of experiment Factor reduces error.
Detailed description of the invention:
Detailed description will be given by the following detailed implementation and drawings by the present invention for ease of explanation,.
Fig. 1 is overall structure diagram of the invention;
Fig. 2 is inside fixed ring structural schematic diagram of the invention;
Fig. 3 is enlarged structure A schematic diagram of the invention;
Fig. 4 is slider structure schematic diagram of the invention;
Fig. 5 is motor installation base schematic diagram of internal structure of the invention;
Fig. 6 is newton pipe schematic diagram of internal structure of the invention.
In figure:1, experimental provision ontology;2, motor installation base;3, supporting leg;4, handle;5, top mounting base;6, arc Positioning ring;7, support rod;8, rotating block;9, shaft;10, fixed block;11, sleeve;12, hinge;13, internal fixed ring;14, it adjusts Locking nub;15, bolt;16, Niu Dunguan;17, partition;18, feeding port;19, spring;20, threaded cap;21, sliding bar;22, driven Bar;23, gas permeable barrier;24, sheet metal;25, feather;26, contact induction device is popped one's head in;27, contact induction device;28, electric time-keeping Device;29, vacuum pump;30, exhaust outlet;31, air inlet pipe;32, sliding part;33, thermovent;34, pedestal;35, motor;36, it drives Axis;37, speed reducer;38, driving shaft;39, block;40, belt;41, electric motor;42, driving lever;43, spill spin block;44, pacify Fill ring;45, flabellum;46, shield;47, spring block;48, vacuum tube;49, link block.
Specific embodiment:
As shown in figures 1 to 6, present embodiment uses following technical scheme:A kind of free fall experimental device, including Experimental provision ontology 1, the experimental provision ontology 1 include motor installation base 2, top mounting base 5, arc positioning ring 6, support Bar 7, newton pipe 16, vacuum pump 29, motor 35, speed reducer 37 and electric motor 41, the motor installation base 2, lower end is fixed There are four supporting leg 3, four supporting legs 3 to be divided to the two sides that 2 lower end surface of motor installation base is respectively and fixedly installed to for two groups for installation Side position, 2 two sides of motor installation base are fixedly installed with a handle 4, and two handles 4 install bottom about motor Seat 2 longitudinal centre line axial symmetry distribution, 2 upper end of motor installation base are fixedly installed with top mounting base 5, the top peace Dress 5 upper surface of seat is cambered design, and two port positions on 5 top of top mounting base are fixedly installed with arc positioning ring 6, The internal diameter of the arc positioning ring 6 is equal to the internal diameter of 5 upper surface of top mounting base, the 5 upper end center position of top mounting base It is fixedly installed with support rod 7, the 7 upper end side of support rod is fixedly connected with rotating block 8, and 8 side of rotating block is equipped with solid Determine block 10, is rotatablely connected between 8 one middle side part of rotating block and 10 1 middle side part of fixed block by shaft 9, the fixed block 10 both ends are fixedly installed with sleeve 11, and 10 1 middle side part of fixed block is fixedly installed with hinge 12, and two of the hinge 12 Turning end is fixedly connected to internal fixed ring 13, and two 13 one end of the internal fixed ring are fixedly connected to adjusting block 14.
Wherein, it is equipped with threaded hole in the middle part of two adjusting blocks 14,14 upper end of adjusting block is equipped with bolt 15, and two The adjusting block 14 is threadedly coupled by threaded hole with bolt 15, is arranged with newton pipe in the middle part of two internal fixed rings 13 16, it is fixedly installed with partition 17 in the middle part of the newton pipe 16, described 16 one end of newton pipe sets that there are two feeding ports 18, described in two 18 bore of feeding port is identical, and two 18 outer surfaces of feeding port are equipped with internal thread groove, and two 18 sides of feeding port are set There is threaded cap 20, the threaded cap 20 is threadedly coupled respectively with corresponding feeding port 18 by internal thread groove, is fed intake described in two It is fixedly connected with sliding bar 21 in the middle part of end face where mouthfuls 18,16 other end of newton pipe is fixedly connected with that there are two follower levers 22, two follower levers 22 about the end face center location axial symmetry distribution where the two, the sliding bar 21 and two from 22 one end of lever is fixedly installed with sliding part 32, and the arc positioning ring 6 is equipped with inside groove, and 32 width of sliding part is equal to arc The width of 6 inside groove of shape positioning ring, the sliding bar 21 and two follower levers 22 are positioned by sliding part 32 and inside groove and arc Ring 6 is slidably connected, and gas permeable barrier 23, the partition 17 is fixedly mounted close to two 22 sides of follower lever in 16 inside of newton pipe Upper end is equipped with sheet metal 24, and 16 bottom of newton pipe of 17 side of partition is equipped with feather 25, two 23 tables of gas permeable barrier Face is equipped with contact induction device probe 26, and 16 two sides of newton pipe are fixedly installed with contact induction device 27, two contact inductions It is fixedly installed with electronic timer 28 in cambered surface where device 27,2 upper surface of motor installation base is fixedly installed with vacuum Pump 29, the 29 lower end side of vacuum pump are equipped with exhaust outlet 30, and 29 upper input of vacuum pump is connected with air inlet pipe 31, institute Air inlet pipe 31 is stated across 6 outer wall of arc positioning ring, 2 side of motor installation base is equipped with several thermovents 33, several described Thermovent 33 is equidistantly distributed in 2 side of motor installation base at place, fixed peace in 2 internal backplane of motor installation base Equipped with pedestal 34,34 upper end of pedestal is fixedly installed with motor 35 and speed reducer 37, and 35 output end of motor passes through driving Axis 36 and 37 input terminal of speed reducer are rotatablely connected, and 37 output end of speed reducer is rotatably connected to driving shaft 38, the driving shaft 38 one end are fixedly installed with block 39, and belt 40 is equipped between the driving shaft 38 and shaft 9, and the driving shaft 38 passes through belt 40 are sequentially connected with shaft 9, are fixedly installed with electric motor 41 on the 2 interior side wall of motor installation base, described electronic 41 output end of motor is rotatably connected to driving lever 42, is fixedly installed with shield 46 on the panel where the electric motor 41, The shield 46 is fixedly installed with spill spin block 43, described 42 one end of driving lever and spill spin block close to 2 side of motor installation base 43 are rotatablely connected, and are set with mounting ring 44 in the middle part of the driving lever 42, flabellum 45, institute are fixedly installed on the outside of the mounting ring 44 It states and is fixedly mounted on 16 one end inner wall of newton pipe there are two spring block 47, the 16 Single port position of newton pipe is equipped with vacuum tube 48,48 two sides of vacuum tube are fixedly installed with link block 49, lead between two link blocks 49 and corresponding spring block 47 Cross the connection of spring 19.
Use state of the invention is:Newton pipe 16 is inserted into internal fixed ring 13 first, adjusts two by bolt 15 The relative position of a adjusting block 14, and then realize the adjusting of 13 internal diameter of internal fixed ring, thus by being fixed in the middle part of newton pipe 16 In internal fixed ring 13, sheet metal 24 and feather 25 are respectively put into newton pipe 16, separated by partition 17, is avoided mutually dry It disturbs, restarts motor 35 and drive the rotation of 37 input terminal of speed reducer, 37 output end of speed reducer drives driving shaft 38 to rotate and then passes through Belt 40 drives shaft 9 to rotate, so that the namely newton pipe 16 of fixed block 10 rotates, sliding bar 21 and follower lever 22 pass through sliding Part 23 slides in 6 inside groove of arc positioning ring, when newton pipe 16 slides into vertically downward, closes motor 35, can see at this time It observes sheet metal 24 and touches contact induction device probe 26, the model J7AN-E3 of contact induction device 27 one step ahead than feather 25 Type contact induction device, 28 model ZN48 electronic timer of electronic timer, then again by vacuum tube 48 and air inlet pipe 31, starting Evacuating air in newton pipe 16 is realized inner vacuum by vacuum pump 29, turns off valve, repeats aforesaid operations, it can be seen that Sheet metal 24 and feather 25 are contacted with contact induction device probe 26 simultaneously, it was therefore concluded that the object of different quality is in vacuum environment Falling speed is consistent.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention, the technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes Change and improvement all fall within the protetion scope of the claimed invention, the claimed scope of the invention by appended claims and its Equivalent thereof.

Claims (8)

1. a kind of free fall experimental device, including experimental provision ontology (1), which is characterized in that the experimental provision ontology (1) Including motor installation base (2), top mounting base (5), arc positioning ring (6), support rod (7), newton pipe (16), vacuum pump (29), motor (35), speed reducer (37) and electric motor (41), the motor installation base (2), there are four lower end fixed installations Supporting leg (3), four supporting legs (3) are divided into two groups of two sides positions for being respectively and fixedly installed to motor installation base (2) lower end surface It sets, motor installation base (2) two sides are fixedly installed with a handle (4), and two handles (4) are installed about motor The distribution of pedestal (2) longitudinal centre line axial symmetry, motor installation base (2) upper end is fixedly installed with top mounting base (5), institute Stating top mounting base (5) upper surface is cambered design, and two port positions on top mounting base (5) top are fixedly installed with Arc positioning ring (6), the internal diameter of the arc positioning ring (6) are equal to the internal diameter of top mounting base (5) upper surface, the top peace Dress seat (5) upper end center position is fixedly installed with support rod (7), and support rod (7) the upper end side is fixedly connected with rotating block (8), rotating block (8) side is equipped with fixed block (10), (8) one middle side part of rotating block and (10) one middle side part of fixed block Between be rotatablely connected by shaft (9), fixed block (10) both ends are fixedly installed with sleeve (11), the fixed block (10) one Middle side part is fixedly installed with hinge (12), and two turning end of the hinge (12) are fixedly connected to internal fixed ring (13), Two described internal fixed ring (13) one end are fixedly connected to adjusting block (14).
2. a kind of free fall experimental device according to claim 1, it is characterised in that:In two adjusting blocks (14) Portion is equipped with threaded hole, and adjusting block (14) upper end is equipped with bolt (15), two adjusting blocks (14) by threaded hole with Bolt (15) is threadedly coupled, and is arranged with newton pipe (16) in the middle part of two internal fixed rings (13), in the newton pipe (16) Portion is fixedly installed with partition (17), and described newton pipe (16) one end is set there are two feeding port (18), two feeding ports (18) Bore is identical, and two feeding port (18) outer surfaces are equipped with internal thread groove, and two feeding port (18) sides are equipped with spiral shell Line lid (20), the threaded cap (20) are threadedly coupled with corresponding feeding port (18) respectively by internal thread groove, two throwings It is fixedly connected with sliding bar (21) in the middle part of end face where material mouth (18), there are two newton pipe (16) other end is fixedly connected Follower lever (22), two follower levers (22) are about the end face center location axial symmetry distribution where the two, the sliding bar (21) it is fixedly installed with sliding part (32) with two follower lever (22) one end, the arc positioning ring (6) is equipped with inside groove, described Sliding part (32) width is equal to the width of arc positioning ring (6) inside groove, and the sliding bar (21) and two follower levers (22) are logical It crosses sliding part (32) and inside groove to be slidably connected with arc positioning ring (6), the newton pipe (16) is internal close to two follower levers (22) gas permeable barrier (23) are fixedly mounted in side, and partition (17) upper end is equipped with sheet metal (24), partition (17) side Newton pipe (16) bottom be equipped with feather (25).
3. a kind of free fall experimental device according to claim 2, it is characterised in that:Two gas permeable barriers (23) Surface is equipped with contact induction device probe (26), and newton pipe (16) two sides are fixedly installed with contact induction device (27), and two It is fixedly installed in cambered surface where contact induction device (27) electronic timer (28), motor installation base (2) upper surface It is fixedly installed with vacuum pump (29), vacuum pump (29) the lower end side is equipped with exhaust outlet (30), vacuum pump (29) top Input terminal is connected with air inlet pipe (31), and the air inlet pipe (31) passes through arc positioning ring (6) outer wall, the motor installation base (2) side is equipped with several thermovents (33), and several thermovents (33) are equidistant in motor installation base (2) side at place It is distributed, is fixedly installed with pedestal (34) in motor installation base (2) internal backplane, pedestal (34) upper end is fixedly mounted There are motor (35) and speed reducer (37), motor (35) output end is rotated by drive shaft (36) and speed reducer (37) input terminal Connection, speed reducer (37) output end are rotatably connected to driving shaft (38), and described driving shaft (38) one end is fixedly installed with gear Block (39) is equipped with belt (40) between the driving shaft (38) and shaft (9), and the driving shaft (38) is by belt (40) and turns Axis (9) transmission connection.
4. a kind of free fall experimental device according to claim 1, it is characterised in that:The motor installation base (2) It is fixedly installed on interior side wall electric motor (41), electric motor (41) output end is rotatably connected to driving lever (42), it is fixedly installed with shield (46) on the panel where the electric motor (41), the shield (46) is close to motor Mounting seat (2) side is fixedly installed with spill spin block (43).
5. a kind of free fall experimental device according to claim 4, it is characterised in that:Described driving lever (42) one end with Spill spin block (43) rotation connection, driving lever (42) middle part are set with mounting ring (44).
6. a kind of free fall experimental device according to claim 5, it is characterised in that:It is solid on the outside of the mounting ring (44) Dingan County is equipped with flabellum (45).
7. a kind of free fall experimental device according to claim 2, it is characterised in that:In described newton pipe (16) one end It is fixedly mounted on wall there are two spring block (47), newton pipe (16) the Single port position is equipped with vacuum tube (48).
8. a kind of free fall experimental device according to claim 7, it is characterised in that:Vacuum tube (48) two sides are solid Dingan County is equipped with link block (49), is connected between two link blocks (49) and corresponding spring block (47) by spring (19).
CN201810802548.6A 2018-07-20 2018-07-20 Free fall experimental apparatus Active CN108847096B (en)

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Publication number Priority date Publication date Assignee Title
CN2282715Y (en) * 1996-05-10 1998-05-27 徐敏 Newton tube
CN104990772A (en) * 2014-08-12 2015-10-21 中国石油大学(北京) Base apparatus for prefabricating crack having any inclination angle in artificial specimen
CN205910919U (en) * 2016-05-13 2017-01-25 蒲玉 Student uses high school physics free fall experimental apparatus
CN206021695U (en) * 2016-07-30 2017-03-15 师敬迟 Ball experiment with falling objects instrument
CN107331253A (en) * 2017-08-25 2017-11-07 将乐县科技馆 A kind of freely falling body apparatus for demonstrating
CN206619319U (en) * 2016-12-19 2017-11-07 李浩伟 One kind motion is through the physics facility that tests the speed
CN206711460U (en) * 2017-03-22 2017-12-05 王泓人 A kind of demonstrator for teaching free falling body
CN206864039U (en) * 2017-05-15 2018-01-09 陈肖伊 Local gravitational acceleration experimental rig for physics teaching
CN107610563A (en) * 2017-11-01 2018-01-19 苏畅 A kind of free fall experimental device
CN206991609U (en) * 2017-05-03 2018-02-09 王晓润 Movement of falling object experimental provision
CN107680461A (en) * 2017-11-23 2018-02-09 成都叶舟科技有限公司 Instructional device for electrician's training
CN206991611U (en) * 2017-05-14 2018-02-09 刘明轩 A kind of physical mechanics acceleration test analogue means
CN107731065A (en) * 2017-11-22 2018-02-23 黄跃 A kind of physics teaching experiment with falling objects equipment
CN207529561U (en) * 2017-06-29 2018-06-22 赵梦珍 A kind of student physics free fall experimental device
CN108269467A (en) * 2018-03-14 2018-07-10 方浩然 A kind of experiment with falling objects apparatus for demonstrating

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2282715Y (en) * 1996-05-10 1998-05-27 徐敏 Newton tube
CN104990772A (en) * 2014-08-12 2015-10-21 中国石油大学(北京) Base apparatus for prefabricating crack having any inclination angle in artificial specimen
CN205910919U (en) * 2016-05-13 2017-01-25 蒲玉 Student uses high school physics free fall experimental apparatus
CN206021695U (en) * 2016-07-30 2017-03-15 师敬迟 Ball experiment with falling objects instrument
CN206619319U (en) * 2016-12-19 2017-11-07 李浩伟 One kind motion is through the physics facility that tests the speed
CN206711460U (en) * 2017-03-22 2017-12-05 王泓人 A kind of demonstrator for teaching free falling body
CN206991609U (en) * 2017-05-03 2018-02-09 王晓润 Movement of falling object experimental provision
CN206991611U (en) * 2017-05-14 2018-02-09 刘明轩 A kind of physical mechanics acceleration test analogue means
CN206864039U (en) * 2017-05-15 2018-01-09 陈肖伊 Local gravitational acceleration experimental rig for physics teaching
CN207529561U (en) * 2017-06-29 2018-06-22 赵梦珍 A kind of student physics free fall experimental device
CN107331253A (en) * 2017-08-25 2017-11-07 将乐县科技馆 A kind of freely falling body apparatus for demonstrating
CN107610563A (en) * 2017-11-01 2018-01-19 苏畅 A kind of free fall experimental device
CN107731065A (en) * 2017-11-22 2018-02-23 黄跃 A kind of physics teaching experiment with falling objects equipment
CN107680461A (en) * 2017-11-23 2018-02-09 成都叶舟科技有限公司 Instructional device for electrician's training
CN108269467A (en) * 2018-03-14 2018-07-10 方浩然 A kind of experiment with falling objects apparatus for demonstrating

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