Curvilinear motion speed and direction observation tester
By designing a curved movement velocity direction observation experimenter, using the LCD writing board and splicing track board, the problem of difficulty in effectively recording and displaying the velocity direction of the ball in the existing technology is solved, and the experiment is efficient and safe, and the teaching effect is improved.
Patent Information
- Application Number
- CN202420632913.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2034-03-29
AI Technical Summary
The prior art is difficult to effectively record and display the velocity direction of the ball in curved motion, resulting in poor experimental results, and the use of equipment is complex and unsafe, which affects the teaching effect.
A curved motion speed direction observation experimenter was designed, using a liquid crystal writing board to display the trajectory, combined with splicing track board and small steel ball, and through the pressure and voltage sensitivity of the liquid crystal writing board, the trajectory is clearly displayed and reused.
It realizes the clear display of multiple movement trajectories on the LCD writing board, which facilitates comparison and analysis, reduces the difficulty of experiment preparation and operation, improves the visibility and success rate of experiments, saves experimental costs, and improves teaching efficiency.
Smart Images
Figure CN222462229U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of teaching equipment, in particular to a curve motion speed direction observation experiment device. Background Art
[0002] In the first section of the chapter "The Motion of Projectiles" in high school physics, "Curvilinear Motion", there is a demonstration experiment in the textbook: "Observe the direction of the velocity of an object moving in a curve". It is necessary to show different motion trajectories through at least three points with different tangent directions. The purpose is to let students confirm and be convinced that the direction of the velocity of an object moving in a curve at any position is always along the tangent direction of the curve.
[0003] Recording the movement trajectory of objects has always been a difficult problem in physics experiments. The moving car can be equipped with devices such as a dropper for dripping ink, and the swinging heavy object can be equipped with methods of leaving traces, such as an hourglass leaking sand, an infusion tube dripping ink, and a magnetic writing board using the magnetic suction method. New materials in recent years include light and shadow canvases, which can be used to leave traces with light and shadow, etc. Each has its own advantages and disadvantages, but these methods are not applicable to the rolling ball, because you cannot install any device on the ball without affecting the normal rolling of the ball.
[0004] Over the years, teachers have used many objects and methods in life, such as dropping a drop of ink on the path that the ball must pass through, letting the ball roll over, and the ball dipped in ink will leave an ink mark on the paper. The textbooks suggest that teachers use a section of water pipe, drip ink at the mouth of the pipe, or soak the ball in ink and quickly take it out with tweezers during the experiment, all in the hope of drawing a longer mark.
[0005] The common disadvantages of these methods are: the ink dipped into the ball is uneven, the ink marks drawn each time are bound to be "anti-climax" and broken in the middle, the used balls need to be wiped clean in time, and after a class, there are a lot of annoying waste products. If you are not careful, the ink will overflow. From the perspective of safety and hygiene, these are not good enough, and the experimental process and results are not satisfactory.
[0006] By combining toy tracks with magnetic writing boards, the small magnetic ball will leave a thicker mark when rolling on the magnetic writing board, which is not like a "line". In addition, the magnetic attraction will affect the movement trajectory of the small ball and cause the small ball to slow down quickly, which will cause unnecessary interference to students' future learning.
[0007] The experimental equipment cannot meet the teaching needs, and the experimental design in the textbooks is very "useless". If experiments are not used in class, it always feels lacking in persuasiveness. If experiments are used, they are time-consuming and laborious, and the results are not good. Most students are still skeptical after watching the experiments. It is impossible to convince students of the experimental facts, and there is a lack of educational emotion. Utility Model Content
[0008] In view of the above-mentioned technical deficiencies, the purpose of the utility model is to provide a curved motion speed and direction observation experiment device, which displays the trajectory through a liquid crystal writing board. The track design is consistent with the experimental effect required by the textbook, which helps teachers optimize teaching design and improve classroom efficiency.
[0009] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0010] The utility model provides a curve motion speed direction observation experiment device, which is characterized by comprising a liquid crystal writing board, a splicing track plate, an experiment device base, a small steel ball and a starting track;
[0011] The liquid crystal writing board is the main component of the display and is arranged in the groove of the base of the experimenter;
[0012] The base of the experimenter is made of two layers of 60-degree EVA boards, the bottom layer is a whole support board, and the middle groove of the upper layer is used to place the LCD writing board; the left and right sides of the base of the experimenter are respectively provided with a hole seat for placing a small steel ball and a square groove for storing the starting track;
[0013] The starting track is an independent component, and the starting track is a right-angled triangle slope;
[0014] The spliced track plate is formed by splicing multiple track plates with each other through dovetail mortise and tenon structures. Each track plate consists of two parts, the upper layer is an acrylic plate with sequential numbers engraved on it, and the bottom layer is a 45-degree EVA foam plate.
[0015] Furthermore, the size of the upper acrylic plate of the track plate is larger than that of the lower foam plate, and the edge difference is 5-10 mm.
[0016] Furthermore, the length of the track groove is changed, and the small steel ball rolls down repeatedly, and the tracks of multiple movements are retained on the liquid crystal writing board for experimental comparative analysis.
[0017] Furthermore, the liquid crystal writing board is provided with a one-button clear switch, which is convenient for re-experimentation and repeated use, thereby reducing the experimental cost.
[0018] The beneficial effects of the utility model are: the utility model can display multiple motion trajectories on the writing board, so that different motion trajectories can be compared and analyzed in the same picture, which has strong exploratory and expansive properties;
[0019] When each experiment is finished or when it is necessary to restart the experiment, the utility model only needs to press the power button to erase all the existing marks. It is convenient, environmentally friendly, and can be reused infinitely. While saving the experimental cost, it implements the new teaching reform concept of "using objects in life to complete classroom teaching".
[0020] The track design of the utility model can smoothly complete the experiments required by the teaching materials, which helps teachers optimize teaching designs and improve classroom efficiency.
[0021] The rail joint of the utility model adopts the design of woodworking mortise and tenon connection mode, thereby avoiding the longitudinal and lateral movement of the mutually connected rails. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0023] Figure 1 A schematic diagram of the structure of the curvilinear motion speed direction observation experiment device provided by the utility model;
[0024] Figure 2 A schematic diagram of the curve motion speed direction observation experiment device provided by the utility model with the last section of A4 and B4 track panels removed;
[0025] Figure 3 A schematic diagram of the curve motion speed direction observation experiment device provided by the utility model without the A4, B4, and B3 track panels;
[0026] Figure 4 A schematic diagram of the curve motion speed direction observation experiment device provided by the utility model without the A4, B4, B3, and B2 track panels;
[0027] Figure 5 A schematic diagram of the base of the curve motion speed direction observation experiment device provided by the utility model;
[0028] Figure 6 A front schematic diagram of a single track plate of a curve motion speed direction observation experiment device provided by the utility model;
[0029] Figure 7 A schematic diagram of the bottom surfaces of two track plates of the curvilinear motion speed direction observation experiment device provided by the utility model;
[0030] Figure 8 The present invention is a schematic diagram of a starting track of a curve motion speed direction observation experiment device provided by the present invention.
[0031] Explanation of the reference numerals: 1. LCD writing board; 2. Splicing track board; 3. Experimenter base; 4. Recess for placing the LCD writing board; 5. Square groove for placing the starting track; 6. Hole for placing the small steel ball; 7. Bottom layer of track board; 8. Upper layer of track board. DETAILED DESCRIPTION
[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1
[0033] like Figure 1 , Figure 5-Figure 8 As shown, the curvilinear motion speed direction observation experiment device comprises a liquid crystal writing board 1, a splicing track board 2, an experiment device base 3, a small steel ball and a starting track;
[0034] The liquid crystal writing board 1 is the main part of the display. It is sensitive to pressure and can clearly display the trajectory of a small moving steel ball with a mass greater than 30 grams. Similarly, it is also sensitive to voltage. Using the power button can eliminate all the marks displayed on the screen with one click, which is convenient for reuse.
[0035] The experimental device base 3 is made of two layers of 60-degree EVA boards, the bottom support board is a whole piece, and the size is 380 mm * 480 mm; the middle of the upper layer is left empty 4 just to put the liquid crystal writing board 1; the left and right sides of the experimental device base 3 are provided with a hole seat 6 for placing a small steel ball and a square groove 5 for storing the start track;
[0036] The spliced track plate 2 is made of multiple plates spliced together by a dovetail mortise and tenon structure. Each small track plate is composed of an upper and a lower part. The upper layer is a colored acrylic plate (green is used in the utility model) with a sequential number engraved on the surface. The bottom layer is a 45-degree EVA foam plate, which can avoid leaving other unnecessary marks on the writing board; the size of the upper acrylic plate of the track plate is slightly larger than that of the lower foam plate, with a difference of 5-10 mm.
[0037] The starting track is an independent component, and the top surface of the starting track is an inclined surface; the starting track is used to start the small steel ball and can also be used to compare the initial velocity of the small steel ball.
[0038] Working principle:
[0039] During the experiment, all the tracks are spliced together, and the whole puzzle board is divided into upper and lower parts. The upper part is numbered A1, A2, A3, A4 from left to right, and the lower part is numbered B1, B2, B3, B4 from left to right. If the upper and lower parts are close together and completely aligned, it is a rectangular puzzle. If they are slightly separated, a curved track groove will be formed in the middle. The width of the middle curved track groove is adjusted to make it suitable for the rolling of the small steel ball used. In order to facilitate the positioning and disassembly of the tracks in the experiment, the EVA board at the bottom of the splicing board is 0.5cm to 1cm smaller than the acrylic board at the top.
[0040] The 45-degree EVA foam board has a suitable hardness. Even if you press it with your hand, it will not leave marks on the display screen. In this way, when taking and placing the track board during the experiment, there will be no marks, which ensures the beauty of the experimental result display diagram;
[0041] The starting secondary ramp device is used to start the small steel ball and compare the initial speed of the small steel ball. In the same experiment of observing the speed direction, the speed of each time can be kept approximately equal (not a necessary condition). In the experiment where the speed needs to be changed, it only needs to be released at different heights;
[0042] When starting the experiment, for the first few times (2-5 times), let the small steel ball roll down from the same position, from left to right, through the curved track, and the small steel ball falls into the storage slot. The purpose is to observe the repeatability of the ball's movement. As long as the track is stable and the initial position is consistent, the trajectory will completely overlap, so the curved track can be clearly recorded;
[0043] To show the direction of velocity at different points on the curve, the length of the track needs to be varied.
[0044] Order and steps to change length:
[0045] like Figure 2 As shown, for the first time, the two blocks marked B4 and A4 on the far right were removed, which was equivalent to reducing the track by about 1 / 4 of its length. The ball was released again, and it was found that at the corresponding turning point, the small steel ball left the original curved track and moved in a straight line.
[0046] like Figure 3 As shown, the piece marked B3 is removed for the second time (the upper part A3 is not necessary to be removed, also to save time), and the ball is released again. It is found that at the corresponding turning point, the small steel ball also leaves the original curved track and moves in a straight line.
[0047] like Figure 4 As shown, the piece marked B2 is removed for the third time, and the ball is released again. It is found that the small steel ball also leaves the original curved track and moves in a straight line.
[0048] Finally, remove all track splicing plates and starting ramps, put down the small steel ball, pick up the writing board, and show the experimental results to the students. The teacher can mark the points where the small steel ball leaves the curved track each time as A, B, and P. Students can easily see that the tangent directions of these points coincide with the straight-line motion trajectory of the small ball displayed on the screen. In addition to being surprised, they completely believe and confirm: "The speed direction of the curved motion is along the tangent direction of the point on the curve."
[0049] The utility model utilizes the characteristic that liquid crystal is relatively sensitive to pressure. When a small steel ball rolls over the surface of a liquid crystal writing board 1, a motion track will be displayed on the writing board. Multiple motion tracks can be displayed in the same picture, which is convenient for comparative analysis. The utility model also utilizes the characteristic that liquid crystal is relatively sensitive to voltage. All marks can be erased with one click of a power button for reuse, which is convenient and economical.
[0050] The utility model has a two-layer design of the upper and lower track plates. The upper acrylic plate is hard and flat, which ensures the strength required for the experiment and enhances the beauty of the experimental equipment; the lower layer is smaller and softer, which avoids leaving extra marks when taking and placing the track plates, making the experimental results clear and pleasing to the eye.
[0051] The track joint of the utility model adopts the design of woodworking mortise and tenon connection, which avoids the longitudinal and lateral movement of the mutually connected tracks and enables teachers and students to enhance their cultural self-confidence and increase their national pride.
[0052] Features of this utility model:
[0053] 1. Design and use of LCD writing board 1
[0054] ① It reduces the difficulty of experimental preparation and experimental operation, increases the visibility of the experiment, and improves the success rate of the experiment;
[0055] ②In the classroom, we used objects in daily life to do physics experiments, which enhanced the emotion of physics learning and implemented the concept of the new education reform;
[0056] 2. Innovative design of track panels:
[0057] ① The upper and lower layers are designed with different materials. The upper acrylic plate is hard and flat, which ensures the strength required for the experiment and enhances the beauty of the experimental equipment; the lower layer uses a 45-degree EVA plate, which is smaller and softer, avoiding unnecessary marks when taking and placing the track plate, making the experimental results clear and pleasing to the eye;
[0058] ②The dovetail groove and mortise and tenon design of the track panels minimizes the longitudinal and lateral movement of the track panels, thereby maintaining the consistency of the track shape. This not only improves the accuracy of the experiment, but also once again demonstrates the great wisdom of the Chinese nation, enhances the cultural confidence of teachers and students, and increases national pride.
[0059] 3. Experimental expansion design:
[0060] In addition to efficiently completing the curve motion speed and direction observation experiment in the classroom, the utility model can also be used for similar horizontal projection experimental research and quantitative calculation to cultivate the ability to apply knowledge.
[0061] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.
Claims
1. Curvilinear motion speed direction observation experiment device, characterized in that: Including LCD writing board, splicing track board, experimenter base, small steel ball and starting track; The liquid crystal writing board is the main component of the display and is placed in the groove of the base of the experimenter; The base of the experimenter is made of two layers of 60-degree EVA boards, the bottom layer is a whole support board, and the middle groove of the upper layer is used to place the LCD writing board; the left and right sides of the base of the experimenter are respectively provided with a hole seat for placing a small steel ball and a square groove for storing the starting track; The starting track is an independent component, and the top surface of the starting track is an inclined surface; The spliced track plate is formed by splicing multiple track plates with each other through dovetail mortise and tenon structures. Each track plate consists of two parts, the upper layer is an acrylic plate with sequential numbers engraved on it, and the bottom layer is a 45-degree EVA foam plate.
2. The curve motion speed direction observation experiment device according to claim 1, characterized in that: The size of the upper acrylic board of the track plate is larger than that of the lower foam board.
3. The curve motion speed direction observation experiment device according to claim 2, characterized in that: The liquid crystal writing board is provided with a one-button clear switch.