A demonstration device for physics horizontal projection and collision experiments

Abstract

The invention discloses a demonstration device for horizontal throwing and collision experiments in physics, comprising a base plate, a vertical plate on the base plate, a fixed plate on the vertical plate, the fixed plate connected to a supporting plate via a first connecting plate, a threaded disk rotatably connected to the fixed plate, a fixed block connected to a lower side of the fixed plate, the fixed plate connected to a track via a second connecting plate, an empty slot in the fixed block, a push plate connected to the slot bottom of the empty slot, and a connecting strip on the push plate, the connecting strip being connected to the vertical rod, one end of the vertical rod being meshed with a thread on the threaded disk, and the other end being slidably connected in a limiting slot, one end of the side surface of the base plate being fixedly connected to a sliding rod, and the other end being rotatably connected to a second screw. The device can perform simulation experiments of horizontal throwing motion and collision of objects according to experimental requirements, and can obtain parameters such as motion time and motion trajectory, effectively improving the accuracy of the simulation experiment, reducing experimental errors, and improving the success rate of the experiment, thereby meeting the requirements of physics experiments.

Description

Technical Field

[0001] The invention relates to the technical field of physical experiment supplies, in particular to a demonstration device for physics horizontal throwing and collision experiments. Background Art

[0002] Physics is a subject that reveals the laws of nature and is an important subject that promotes technological progress. In order to improve the concept of understanding in the teaching process and make it easier for students to understand the laws of physics, a lot of experimental equipment will be used in the physics teaching process. For example, experimental equipment for demonstrating the horizontal motion of objects combined with free fall, experimental equipment for demonstrating the collision motion of objects, etc., objects are thrown horizontally with a certain initial velocity. If the object is only affected by gravity, such motion is called horizontal motion. The horizontal motion can be regarded as the combined motion of uniform linear motion in the horizontal direction and free fall motion in the vertical direction. The horizontal motion is a relatively important and classical physical model in physics. However, the existing demonstration device of horizontal motion and ball collision motion experiment has a single function and cannot adjust the initial parameters of the experiment. The motion trajectory of the object is mostly viewed by the naked eye, which cannot intuitively reflect the motion trajectory of the object, and the timing is also inaccurate. To solve the above problems, the present invention provides a demonstration device for physics horizontal throwing and collision experiments. Summary of the invention

[0003] The purpose of the present invention is to provide a demonstration device for physics horizontal projection and collision experiments to solve the problems raised in the above-mentioned background technology.

[0004] The top end of the vertical rod is engaged with the first and second end of the vertical rod, and the bottom end of the vertical rod is engaged with the first and second second end of the vertical rod.

[0005] Preferably, a carrying plate is provided inside the drop box, and a dark groove is formed between the drop box and the carrying plate, a touch switch is provided at the bottom of the dark groove, and a second spring is connected between the drop box and the carrying plate.

[0006] Preferably, the two side walls of the drop box are respectively meshed with a second screw and slidably connected with a slide rod, and the lower end of the second screw is rotatably connected to the bottom plate, and the slide rod is fixedly connected to the bottom plate.

[0007] Preferably, a cavity is provided on the upper side of the vertical plate, and a first screw is provided inside the cavity, one end of the first screw is rotatably connected to a side wall at one end of the cavity, and the other end penetrates the side wall at the other end of the cavity and extends to the outside of the vertical plate, and a slider is meshedly connected to the outer side of one end of the first screw located inside the cavity, and a connecting block is fixedly connected to the upper side of the slider, and the upper end of the connecting block extends to the outside of the vertical plate through a through groove provided on the top of the cavity and is fixedly connected to the fixed plate, and the lower side of the fixed plate and located on one side of the connecting rod is connected to the fixed block through an electromagnetic valve.

[0008] Preferably, the vertical plate is provided with a plurality of inner cavities, and dark-colored magnetic powder is placed inside each inner cavity. A slide groove is provided in the vertical plate, and a magnetic rod is slidably connected to the inside of the slide groove. One end of the magnetic rod extends to the outside of the vertical plate through the notch of the slide groove and is fixedly connected to a handle.

[0009] Preferably, the four corners of the base plate are meshed with bolts, the lower ends of the bolts are rotatably connected to the chassis via universal balls fixedly connected thereto, and a level is provided on the upper side of the fixed plate.

[0010] Preferably, a grid is provided on the surface of the vertical plate.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows: through the cooperation between the threaded disk and the vertical rod, the present invention realizes that the clockwise rotation of the threaded disk can make the vertical rod connected thereto move in the direction away from the fixed block, so that the push plate squeezes the first spring, and when the push plate moves to the specified position, the threaded disk is pulled by the turntable and the connecting rod to disconnect it from the vertical rod. At this time, the first spring will bounce the push plate and make the small steel ball fall from the track. When the small steel ball falls from the track, it will attract the magnetic powder inside the inner cavity and adsorb the magnetic powder on the side wall of the inner cavity, so that the movement trajectory of the small steel ball can be intuitively displayed. The device can also perform collision tests. The initial speed of the small steel ball can be accurately adjusted by pulling the push plate by the threaded disk. The device can ensure that the track is always in a horizontal state by adjusting four bolts, and experiments can also be performed when a suitable experimental platform cannot be found. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a structural schematic diagram I with a first connecting plate of the present invention;

[0014] Figure 3The structure with the first connecting plate of the present invention is schematically shown in FIG. Figure II

[0015] Figure 4 An exploded view of the vertical plate and the fixed plate of the present invention;

[0016] Figure 5 A schematic diagram of the connection between the fixing plate and the first connecting plate and the second connecting plate of the present invention;

[0017] Figure 6 It is a schematic diagram of the connection between the connecting rod and the threaded disk of the present invention;

[0018] Figure 7 For the present invention Figure 6 A magnified image of point A;

[0019] Figure 8 It is a schematic diagram of the internal structure of the blind groove of the present invention;

[0020] Fig. 9 It is a schematic diagram of the structure of the inner cavity of the present invention.

[0021] In the figure: 1, bottom plate, 2, vertical plate, 3, cavity, 4, through groove, 5, slider, 6, connecting block, 7, fixing plate, 8, first screw rod, 9, first connecting plate, 10, connecting rod, 11, turntable, 12, threaded plate, 13, make way groove, 14, fixing bar, 15, fixing column, 16, solenoid valve, 17, fixing block, 18, empty groove, 19, push plate, 20, first spring, 21, connecting bar, 22, vertical rod, 23, second connecting plate, 24, track, 25, concealed Cavity, 26, timer, 27, slide bar, 28, second screw rod, 29, drop box, 30, dark groove, 31, second spring, 32, load-bearing plate, 33, touch switch, 34, bolt, 35, universal ball, 36, chassis, 37, inner cavity, 38, slide groove, 39, magnetic rod, 40, handle, 41, third spring, 42, card plate, 43, bayonet, 44, card ball, 45, support plate, 46, limit groove, 47, first photoelectric sensor, 48, second photoelectric sensor. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1-9Embodiment 1, a demonstration device for horizontal throwing and collision experiments in physics, including a bottom plate 1, which is the bearing base of the whole device. A small steel ball is used as a moving object in the experiment. Sometimes, due to various reasons, the position where the device is placed may not be horizontal, which will affect the experimental effect. Therefore, the four corners of the bottom plate 1 are meshed and connected with bolts 34, and the lower ends of the bolts 34 are rotatably connected with a chassis 36 through a universal ball 35 fixed thereon, so that the rotation angle of the device can be conveniently adjusted. A level gauge is provided on the upper side of the fixed plate 7, which can detect whether the placement is horizontal at any time.

[0024] The upper side of the bottom plate 1 is fixedly connected to a vertical plate 2, and a grid is provided on the vertical plate to facilitate students to observe the movement trajectory of the small steel ball in the experiment. The positions of the small steel ball and the grid are determined by repeated experiments, so as to draw the trajectory of the entire horizontal projection motion. However, this requires repeated experiments and relies on naked eye observation, which has great uncertainty and instability. In order to solve this problem, a plurality of inner cavities 37 are provided inside the vertical plate 2, and dark-colored magnetic powder is placed inside each inner cavity 37. A slide groove 38 is provided on the end surface of one end of the vertical plate 2, and a magnetic rod 39 is slidably connected to the inside of the slide groove 38. One end of the magnetic rod 39 extends to the outside of the vertical plate 2 through the notch of the slide groove 38 and is fixedly connected to a handle 40. The material of the vertical plate 2 is white translucent plastic. The material of the experimental object is a small steel ball that can interact with the magnetic powder. When the small steel ball falls from the front of the vertical plate 2, the magnetic powder will be adsorbed to the side wall of the vertical plate 2 under the action of magnetic force, and will be adsorbed on the side wall of the vertical plate 2 under the action of electrostatic force, so that the movement trajectory of the small steel ball will be intuitively displayed on the vertical plate 2. The existence of multiple inner cavities 37 divides the space, which is conducive to adsorbing the magnetic powder on the inner surface of the inner cavity 37 through electrostatic force. When it is necessary to clean the displayed track on the vertical plate 2, you only need to hold the handle 40 to make the magnetic rod 39 slide back and forth in the slide groove 38, so that the magnetic powder can be sucked back to achieve the purpose of cleaning the trace. In addition, the force between the small steel ball and the magnetic powder is very small, and the impact on the movement trajectory of the small steel ball is very slight, which can fully meet the accuracy requirements of student demonstration experiments. The upper side of the vertical plate 2 is connected to a fixed plate 7, and the lower side of the fixed plate 7 is rotatably connected to a threaded disk 12 through a connecting rod 10. A clearance groove 13 is provided on one side of the vertical plate 2 close to the threaded disk 12. The clearance groove 13 allows one side of the threaded disk 12 to extend into the interior thereof, thereby reducing the width of the fixed plate 7 to a certain extent, thereby making the device more stable. The upper end of the connecting rod 10 passes through the fixed plate 7 and is fixedly connected to a turntable 11. Rotating the turntable 11 can drive the threaded disk 12 to rotate through the connecting rod 10. A fixed block 17 is connected to the lower side of the fixed plate 7 and located on one side of the connecting rod 10. The right end of the fixed plate 7 is connected to a track 24 through a second connecting plate 23.

[0025] The fixed block 17 is provided with an empty groove 18 inside, and the empty groove 18 is communicated with the slideway in the track 24. A push plate 19 is slidably connected inside the empty groove 18. The push plate 19 is connected to the bottom of the empty groove 18 through a first spring 20, and a connecting strip 21 is fixedly connected to one side of the push plate 19 close to the first spring 20. The connecting strip 21 penetrates the first spring 20 and the bottom of the empty groove 18 and is fixedly connected to a vertical rod 22. One end of the vertical rod 22 is engaged with the thread on the threaded disk 12. When the threaded disk 12 is rotated clockwise, the spiral pattern on the threaded disk 12 can make the vertical rod 22 move in a direction away from the fixed block 17, which greatly improves the accuracy of the movement of the vertical rod 22. For example, when the threaded disk 12 rotates one circle, the vertical rod 22 The rod 22 slides 1mm, so that the thrust of the push plate 19 can be accurately controlled, thereby controlling the initial speed of the small steel ball. When the vertical rod 22 moves, it will pull the push plate 19 through the connecting strip 21 to squeeze the first spring 20. When the push plate 19 moves to the specified position, the turntable 11 is pulled upward to disconnect the threaded disk 12 from the vertical rod 22. At this time, the first spring 20 will bounce the push plate 19 open, and the push plate 19 will push the small steel ball used in the experiment to move to the right. A drop box 29 is provided on the lower side of the vertical plate 2 for receiving the dropped small steel ball. The height of the small steel ball falling is known. According to the formula of free fall and the trajectory drawn on the grid on the vertical plate 2, students can verify, calculate, and understand the laws of physics.

[0026] If the time of the small steel ball's movement can be measured, and the known movement height is added, the free-falling body's movement calculation verification can be performed. The manual timing method will affect the data preparation due to individual differences of people. In addition, it is a student verification test, and the equipment cannot be made very large, so the movement time of the small steel ball is relatively short. A small error may cause a large data impact. One end of the upper side of the bottom plate 1 is fixedly connected to a slide bar 27, and the other end is rotatably connected to a second screw rod 28. A drop box 29 is provided above the bottom plate 1. One end of the drop box 29 is meshed and connected to the second screw rod 28, and the other end is slidably connected to the slide bar 27. The upper side of the drop box 29 forms a dark groove 30 with the bearing plate 32. The bottom of the dark groove 30 is connected to the bearing plate 32 through the second spring 31. The bearing plate 32 does not contact the second screw rod 28 and the slide bar 27. In order to facilitate the measurement of height, an arrow scale corresponding to the position of the bearing plate 32 is provided on the outer wall of the drop box 29. Rotating the second screw 28 can control the height of the drop box 29 and thus control the height of the carrying plate 32. Different experiments can be carried out to verify the laws of physics. A touch switch 33 is provided at the bottom of the dark groove 30, and the touch switch 33 is movably linked to the carrying plate 32. A first photoelectric sensor 47 is fixedly connected to the upper side surface of the right end of the track 24. A timer 26 is provided on the upper side surface of the vertical plate 2. When the small steel ball rushes out of the track 24, it will be detected by the first photoelectric sensor 47. At this time, the timer 26 starts timing. The touch switch 33, the first photoelectric sensor 47 and the timer 26 are electrically connected. When the small steel ball falls on the carrying plate 32, it will impact the carrying plate 32 so that it overcomes the elastic force of the second spring 31 and is squeezed to the touch switch. When the supporting plate 32 squeezes the touch switch 33, the timer 26 stops timing, so that the movement time of the small steel ball in the air can be accurately measured. The touch switch 33, the first photoelectric sensor 47 and the timer 26 are all prior art features and their principles and structures are not the technical features of the present invention, so the present invention will not elaborate on them. For example, the first photoelectric sensor 47 can adopt Omron's EE-SX951-R photoelectric sensor. The touch switch 33, the first photoelectric sensor 47 and the timer 26 are all connected to the external power supply through a cable. The timer 26 is located in the upper right corner of the device for easy observation. Accurate movement time can be obtained through these components, thereby facilitating the calculation and verification of the movement process.

[0027] Embodiment 2, on the basis of embodiment 1, this device can also simulate the collision experiment of two small steel balls to let students recognize and learn physical principles such as conservation of momentum and conservation of energy. Specifically, a cavity 3 is provided on the upper side of the vertical plate 2, and a first screw 8 is provided inside the cavity 3. One end of the first screw 8 is rotatably connected to the side wall of one end of the cavity 3, and the other end penetrates the side wall of the other end of the cavity 3 and extends to the outside of the vertical plate 2. The first screw 8 is meshed and connected with a slider 5 on the outer side of one end of the cavity 3. A connecting block 6 is fixedly connected to the upper side of the slider 5. The upper end of the connecting block 6 extends to the outside of the vertical plate 2 through the through groove 4 provided on the top of the cavity 3 and is fixedly connected to the fixed plate 7. The first screw 8 can be rotated through the slider 5. And the connecting block 6 is used to adjust the position of the fixing plate 7 and the positions of the parts connected thereto. The lower side of the fixing plate 7 and one side of the connecting rod 10 is connected to the fixing block 17 through the electromagnetic valve 16. The upper side of the end of the track 24 close to the fixing block 17 is provided with a second photoelectric sensor 48, so that the present invention can not only be used for experiments of horizontal projection but also for collision experiments. When doing the collision experiment, the fixing plate 7 is first adjusted to the middle of the vertical plate 2, and then two small steel balls are placed inside the track 24 and in front of the push plate 19 respectively. The push plate 19 pushes the small steel ball in front of it. When the small steel ball moves from the empty slot 18 to the inside of the track 24, it will be detected by the second photoelectric sensor 48. At this time, the electromagnetic valve 16 starts to pull the fixing block 17 upward (such as Figure 3 As shown), the small steel ball inside the track 24 will be knocked out by the small steel ball pushed by the push plate 19 and then fall from one end of the track 24, and the small steel ball pushed by the push plate 19 will move back under the action of the reaction force, and then fall from the other end of the track 24. The second photoelectric sensor 48 and the solenoid valve 16 are both electrically connected to the controller. After receiving the signal from the second photoelectric sensor 48, the controller will immediately control the solenoid valve 16 to pull up. When the experiment is completed, the solenoid valve 16 can be made to slide down through the controller to reset the fixed block 17. The second photoelectric sensor 48, the solenoid valve 16, and the controller are all prior art features, and their principles and structures are not the technical features of the present invention, so they are not described in detail. For example, the second photoelectric sensor 48 can also adopt Omron's EE-SX951-R photoelectric sensor. The purpose of using the solenoid valve 16 to pull up the fixed block 17 is to provide movement space for the small steel ball after rebounding. In addition, indicative arrow scales are provided at the lower parts of both ends of the track 24 to facilitate the measurement of position and calculation of data.

[0028] For embodiments 1 and 2, in order to increase the connection stability between the threaded disk 12 and the connecting strip 21 and further prevent skewing due to elastic force, the left side of the fixing plate 7 is connected to the supporting plate 45 through the first connecting plate 9, and the middle part of the lower side of the threaded disk 12 is fixedly connected to the fixing strip 14, and the lower end of the fixing strip 14 extends to the dark cavity 25 provided inside the fixing column 15, and the fixing column 15 is fixedly connected to the supporting plate 45, and the lower end of the vertical rod 22 is slidably connected to the inside of the limiting groove 46 provided on the supporting plate 45. The cooperation between the fixing strip 14 and the fixing column 15 can make the threaded disk 12 rotate more smoothly, and the limiting groove 46 can prevent the threaded disk 12 from rotating when The vertical rod 22 is driven to twist. In addition, the bottom of the dark cavity 25 is connected to a clamping plate 42 through a third spring 41. The upper side of the clamping plate 42 is provided with multiple bayonet holes 43. The lower end surface of the fixed bar 14 is fixedly connected with multiple clamping balls 44. The multiple clamping balls 44 and the multiple bayonet holes 43 are mutually engaged, which can allow the threaded disk 12 to be fixed at any angle to a certain extent, thereby facilitating operation. The height of the support plate 45 is slightly lower than the connecting bar 21. When the fixing block 17 is removed, the movement speed will not be too fast because the experiment is for the convenience of observing and recording physical laws. After the rebounded small steel ball moves out of the track 24, it will not touch the support plate 45 during the falling process, so that the experiment can be carried out stably.

[0029] Working principle: When conducting a horizontal projectile motion experiment, place a small steel ball in front of the push plate 19, then rotate the turntable 11 to rotate the threaded disk 12, so that the vertical rod 22 pulls the push plate 19 through the connecting strip 21 to squeeze the first spring 20. However, when the vertical rod 22 moves to the specified position, pull the turntable 11 to disconnect the threaded disk 12 from the vertical rod 22. At this time, the push plate 19 will be bounced open under the action of the first spring 20, thereby pushing the small steel ball and giving it a certain initial speed. Then the small steel ball will fall from the inside of the track 24. At the moment the small steel ball falls from the track 24, the first photoelectric sensor 47 will receive a signal to start the timer 26. During the falling process, the magnetic powder inside the inner cavity 37 will be adsorbed onto the side wall of the inner cavity 37, thereby displaying the motion trajectory of the small steel ball. When the small steel ball falls on the supporting plate 32, the supporting plate 32 will squeeze the touch switch 33. At this time, the timer 26 will stop timing, thereby displaying the motion time of the small steel ball.

[0030] When doing a collision test, first adjust the fixed plate 7 to the middle of the vertical plate 2, then place two small steel balls inside the track 24 and in front of the push plate 19 respectively, then rotate the turntable 11 and pull the turntable 11 to make the push plate 19 push the small steel balls in front of it. When the small steel balls move from the empty slot 18 to the inside of the track 24, they will be detected by the second photoelectric sensor 48. At this time, the solenoid valve 16 will pull the fixed block 17 to move upward (such as Figure 3As shown), the small steel ball inside the track 24 will be knocked out by the small steel ball pushed by the push plate 19 and then fall from one end of the track 24, and the small steel ball pushed by the push plate 19 will move back under the action of the reaction force, and then fall from the other end of the track 24. During the falling process, the magnetic powder will be attracted to display the movement trajectory.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A demonstration device for physics horizontal throwing and collision experiments, comprising a bottom plate (1), characterized in that: The upper side of the bottom plate (1) is fixedly connected to a vertical plate (2), the upper side of the vertical plate (2) is connected to a fixed plate (7), the lower side of the fixed plate (7) is rotatably connected to a threaded disk (12) via a connecting rod (10), the upper end of the connecting rod (10) passes through the fixed plate (7) and is fixedly connected to a rotating disk (11), the lower side of the fixed plate (7) and located on one side of the connecting rod (10) is connected to a fixed block (17), the right end of the fixed plate (7) is connected to a track (24) via a second connecting plate (23), an empty slot (18) is provided inside the fixed block (17), and the fixing plate (7) is fixedly connected to a vertical plate (24) via a connecting rod (23). The empty slot (18) is communicated with a slideway in the track (24), a push plate (19) is slidably connected inside the empty slot (18), the push plate (19) is connected to the bottom of the empty slot (18) through a first spring (20), and a connecting strip (21) is fixedly connected to a side surface of the push plate (19) close to the first spring (20), the connecting strip (21) passes through the first spring (20) and the bottom of the empty slot (18) and is fixedly connected to a vertical rod (22), one end of the vertical rod (22) is meshed with a thread on the threaded disk (12), and a drop box (29) is provided on the lower side surface of the vertical plate (2); A cavity (3) is provided on the upper side of the vertical plate (2), and a first screw (8) is provided inside the cavity (3). One end of the first screw (8) is rotatably connected to a side wall at one end of the cavity (3), and the other end penetrates the side wall at the other end of the cavity (3) and extends to the outside of the vertical plate (2). A slider (5) is meshingly connected to the outer side of one end of the first screw (8) located inside the cavity (3), and a connecting block (6) is fixedly connected to the upper side of the slider (5). The upper end of the connecting block (6) extends to the outside of the vertical plate (2) through a through groove (4) provided on the top of the cavity (3) and is fixedly connected to a fixing plate (7). The first screw rod (8) is rotated to adjust the position of the fixed plate (7) and the position of the parts connected thereto through the slider (5) and the connecting block (6); the lower side surface of the fixed plate (7) and located on one side of the connecting rod (10) is connected to the fixed block (17) through the electromagnetic valve (16); the upper side surface of one end of the track (24) close to the fixed block (17) is provided with a second photoelectric sensor (48); the two side walls of the drop box (29) are respectively meshed with the second screw rod (28) and slidably connected with the slide rod (27); the lower end of the second screw rod (28) is rotatably connected to the bottom plate (1), and the slide rod (27) is fixedly connected to the bottom plate (1); The drop box (29) is provided with a bearing plate (32) inside, and a dark groove (30) is formed between the drop box (29) and the bearing plate (32), a touch switch (33) is provided at the bottom of the dark groove (30), and a second spring (31) is connected between the drop box (29) and the bearing plate (32), the bearing plate (32) and the second screw rod (28) and the slide rod (27) are not in contact, and the touch switch (33) and the bearing plate (32) are movably connected, the upper side surface of the right end of the track (24) is fixedly connected to a first photoelectric sensor (47), and a timer (26) is provided on the upper side surface of the vertical plate (2); The vertical plate (2) is provided with a plurality of inner cavities (37), and dark-colored magnetic powder is placed inside each inner cavity (37). A slide groove (38) is provided on an end surface of one end of the vertical plate (2), and a magnetic rod (39) is slidably connected inside the slide groove (38). One end of the magnetic rod (39) extends to the outside of the vertical plate (2) through a notch of the slide groove (38) and is fixedly connected to a handle (40).

2. A demonstration device for physics horizontal projection and collision experiment according to claim 1, characterized in that: The four corners of the base plate (1) are meshed with bolts (34), the lower ends of the bolts (34) are rotatably connected to a chassis (36) via a universal ball (35) fixedly connected thereto, and a level is provided on the upper side of the fixed plate (7).

3. A demonstration device for physics horizontal projection and collision experiment according to claim 1, characterized in that: The surface of the vertical plate (2) is provided with a grid.

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