An integrated demonstration device for the isochronous nature of projectile splitting and merging motion

Abstract

This invention provides an integrated demonstration device for the isochronous propagation of projectile motion, comprising a base plate and a rotating frame. The rotating frame is rotatably connected to the base plate. A handle is provided on one side of the rotating frame, with the connection between the rotating frame and the base plate as the boundary, and a cylindrical assembly is provided on the other side. An end seat is also provided on the side of the base plate with the cylindrical assembly, and a cylinder is mounted on the end seat. A channel is provided on the base plate to allow a small ball in the cylinder to fall freely. This invention enables flexible changes in the initial velocity of the projectile, overcoming the limitation of fixed initial velocity in existing devices. It can intuitively demonstrate that "projectile motion and free fall with different initial velocities land simultaneously" and "the isochronism between projectile motion and uniform linear motion with a constant initial velocity," directly verifying that "the time of projectile motion is independent of the initial velocity," thus overcoming the limitation of existing devices that cannot compare motions simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of experimental device technology, and in particular to an integrated demonstration device for the isochronous nature of projectile splitting and merging motion. Background Technology

[0002] The school's laboratory often provides teachers with two types of projectile drop apparatus for demonstrating the isochronism of projectile motion and free fall motion: Projectile Drop Apparatus 1 and Projectile Drop Apparatus 2.

[0003] (I) Analysis of the structure and shortcomings of the horizontal projectile vertical drop instrument 1:

[0004] The projectile drop apparatus consists of a base plate, a fixed steel plate, an elastic steel plate, and a claw. Before demonstration, hold the handle horizontally, bend the elastic steel plate, and clamp it together with the fixed steel plate to hold a small ball. Then, use the claw to hold the elastic steel plate to prevent the ball from falling. Next, place another small ball on the base plate on the other side of the elastic steel plate. When you press down on the claw with your thumb, causing the elastic steel plate to return to its original shape and spring outwards, the elastic steel plate will propel the horizontally placed ball, causing it to undergo projectile motion. Simultaneously, the small ball clamped between the elastic and fixed steel plates is released and falls freely through a hole in the base plate. Figure 1 As shown in (a).

[0005] The horizontal projectile vertical drop instrument 1 has the following shortcomings in actual use:

[0006] 1. Because the elastic coefficient k of the elastic steel sheet remains constant, the degree of deformation of the elastic steel sheet remains constant in each experiment, so the magnitude of the elastic force generated by the steel sheet remains constant, which means that the initial velocity of the projectile cannot be changed.

[0007] 2. Before the experiment, when placing two small balls in the projectile drop apparatus 1, the experimenter could only visually determine that they were at the same height. Furthermore, because the projectile balls were placed in a position where they could easily fall, the experimenter would often slightly raise the angle Φ of the steel plate supporting the projectile balls to prevent them from falling. This could cause the ball to undergo oblique projectile motion, resulting in an error Δh. Figure 1 As shown in (b).

[0008] (II) Analysis of the structure and shortcomings of the horizontal projectile vertical drop instrument 2

[0009] The commercially available projectile launcher consists of a hammer, a release plate, ball 1, and ball 2. In use, balls 1 and 2 are hung on the left and right sides of the release plate, respectively. The hammer is then lifted to strike the release plate. Mounting holes are designed on balls 1 and 2 to hold the balls on the release plate, and a mounting pin is located at the end of the release plate. During use, the hammer is first lifted to a certain height and then lowered naturally. At the moment the hammer strikes the release plate, ball 2 detaches from the release plate and falls freely, while ball 1 is launched by the release plate and undergoes projectile motion. Changing the hammer's release height alters the striking force, thus changing the initial velocity of the projectile. Figure 2 As shown in (a).

[0010] The horizontal projectile vertical drop instrument 2 has the following shortcomings in actual use:

[0011] Since the ball was initially attached to the mounting pin on the release plate before being launched, ball 2 first detaches from the pin and falls freely after the hammer strikes the release plate. Ball 1 continues its forward motion until it detaches from the pin before beginning its projectile motion. Therefore, there is a time difference Δt between the start of ball 1's projectile motion and the start of ball 2's free fall. Figure 2 As shown in (b), t represents time and Δt represents the time difference.

[0012] In addition, both the horizontal projectile drop instrument 1 and the horizontal projectile drop instrument 2 have a common problem: neither of them can simultaneously conduct comparative analysis of the process of multiple small balls with different initial velocities being simultaneously launched and dropped. Therefore, they cannot well prove that "the time of the horizontal projectile motion is independent of the magnitude of the initial velocity".

[0013] The improved apparatus is based on the original apparatus's comparative experiments, with modifications to controllable variables, enabling demonstration experiments in three aspects: First, verifying that the time of projectile motion is independent of the initial velocity magnitude but depends on the falling height. Second, demonstrating the isochronism between projectile motion and vertical free fall. Third, demonstrating the isochronism between projectile motion with a constant initial velocity and horizontal uniform linear motion. This apparatus can verify the isochronism of projectile motion and its two component motions within the same experimental setup. Utility Model Content

[0014] To address the technical problems in existing technologies, such as the inability to change the initial velocity of a projectile, the inclination angle Φ of the steel plate supporting the projectile being raised to prevent it from falling and causing it to become an oblique projectile, the time difference Δt between the start of the projectile motion of ball 1 and the start of the free fall of ball 2, and especially the inability to simultaneously compare and analyze the process of multiple balls with different initial velocities being projected and falling vertically, this utility model provides an integrated demonstration device for the isochronous separation and combination of projectile motion.

[0015] The integrated demonstration device for isochronous projectile splitting and merging motion provided by this utility model adopts the following technical solution:

[0016] An integrated demonstration device for isochronous projectile motion includes a base plate and a rotating frame. The rotating frame is rotatably connected to the base plate. A handle is provided on one side of the rotating frame, with the connection between the rotating frame and the base plate as the boundary, and a cylinder assembly is provided on the other side. An end seat is also provided on the side of the base plate with the cylinder assembly. A cylinder is mounted on the end seat. A channel is provided on the base plate to allow a small ball in the cylinder to fall freely.

[0017] Furthermore, the cylindrical assembly and the fifth cylindrical body are small cylindrical or small square cylinders, and the cylindrical assembly includes a first cylindrical body, a second cylindrical body, and a third cylindrical body.

[0018] Furthermore, the rotating frame is connected to the base plate via a rotating shaft. With the rotating shaft installation position as the boundary, a handle is installed on one side of the rotating frame, and cylinder one, cylinder two, and cylinder three are installed on the other side.

[0019] Furthermore, a clamp is installed on the lower side of the cylinder five, and a small, removable plate is installed below the clamp. The small plate 11 is located above the free fall channel, and the thickness of the small plate is the height of the lower edge of the cylinder five to the bottom plate. The free fall channel is a small hole.

[0020] Furthermore, an inverted U-shaped base is provided directly above the second cylinder in the rotating frame, and a fourth cylinder is installed on the base. The fourth cylinder is parallel to and in the same direction as the opening of the second cylinder.

[0021] Furthermore, a second base plate is seamlessly connected to the side of the base plate near the rotating frame via slots and bolts. The second base plate is equipped with a blocking component, which allows the rotating frame and the two corresponding cylinders on the base to stop moving simultaneously.

[0022] Furthermore, the blocking element is a stop post or a blocking frame.

[0023] Furthermore, the upper surface of the second base plate is coated with lubricating oil.

[0024] In summary, the beneficial effects of this utility model are as follows:

[0025] 1. This utility model sets multiple small square tubes on a rotating frame and provides an adjustable handle. By adjusting the handle, the experimenter can control the rotational angular velocity of the rotating frame. Since the distance between the different small square tubes and the rotating axis is different, the initial velocity of the ball when it is thrown is also different (the farther the distance, the greater the initial velocity). This realizes the flexible change of the initial velocity of the projectile ball and breaks through the limitation of the fixed initial velocity of the original device.

[0026] 2. By fixing a small square tube, the width and height of which are only 0.2mm larger than the diameter of the ball, the bottom of which is horizontal and the depth is 1.2-1.5 times the radius of the ball, the ball is stably confined inside the tube and will not roll or fall during use. There is no need to raise the angle of the steel plate to prevent the ball from falling. This ensures that the bottom of the small square tube is horizontal and the initial velocity direction of the ball is strictly horizontal when it is thrown, avoiding the errors caused by projectile motion.

[0027] 3. This utility model, by setting a trapezoidal blocking frame and a clamp, allows all the small balls inside the small square tubes to move in a circular motion along with the rotating frame when it rotates. When the rotating frame hits the trapezoidal blocking frame, it will suddenly stop rotating, and the small balls inside the tubes will fly out simultaneously due to inertia (projectile motion). The free-falling small balls are fixed by the long tail clamp. When the rotating frame hits the long tail clamp, the clamp will release instantly, and the small balls will fall freely from the round hole at the same time. The motion of the projectile small balls and the free-falling small balls starts completely synchronously, eliminating the time difference.

[0028] 4. This invention features three small square tubes at different distances from the axis of rotation on a rotating frame, and another small square tube on a base plate, allowing for the simultaneous launching of three balls with different initial velocities. Simultaneously, a free-falling ball is also launched, enabling a synchronous comparison of "multiple initial velocity projectile motion + free fall." This provides a clear demonstration of "the simultaneous landing of projectile motion and free fall with different initial velocities" and "the synchronicity between projectile motion and uniform linear motion with a constant initial velocity." The experiment can be repeated multiple times by varying the initial velocity and the falling height, yielding stable and reliable results that directly verify that "projectile motion time is independent of initial velocity," overcoming the limitation of existing devices that cannot simultaneously compare projectile motions. Attached Figure Description

[0029] Figure 1 A process analysis diagram for demonstrating the present invention, the horizontal projectile vertical drop instrument 1;

[0030] Figure 2 A process analysis diagram demonstrating the present invention, the horizontal projectile vertical drop instrument 2;

[0031] Figure 3 This is a schematic diagram of the structure of the first embodiment of the present utility model;

[0032] Figure 4 This is a schematic diagram of the structure of the second embodiment of the present utility model;

[0033] Figure 5 This is a schematic diagram of the structure used in this invention to verify the isochronism of projectile and horizontal motion.

[0034] Figure 6 Schematic diagram of the projectile motion experiment with three balls at the same height but different speeds.

[0035] In the diagram: 5, substrate; 16, small hole. Detailed Implementation

[0036] The present invention will be further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but are not intended to limit the present invention.

[0037] Example: Figures 1-6 The diagram shows an integrated demonstration device for the isochronous parallel projectile motion.

[0038] Reference Figure 3 As shown, this utility model discloses an integrated demonstration device for the isochronous parallel projectile motion, comprising a base plate 1 and a rotating frame 2. The rotating frame is connected to the base plate via a rotating shaft 14. With the rotating shaft's installation position as the boundary, a handle 3 is installed on one side of the rotating frame, and cylinders one (cylinder body 6), two (cylinder body 7), and three (cylinder body 8) are installed on the other side. Figure 3 As you can see, when the handle drives the rotating frame to rotate around the axis, the three cylinders simultaneously rotate in opposite directions around the axis.

[0039] An end seat 4 is also installed on the base plate on the same side as the rotating frame that mounts the cylinder. A cylinder 5 (cylinder body 5) is mounted on the end seat, and a clamp 9 is installed on the lower side of the cylinder 5. A small, removable plate 11 is also installed below the clamp. The thickness of the small plate is exactly the height of the lower edge of the cylinder 5 to the base plate, so that the three projectiles and the freely falling ball are at the same horizontal height.

[0040] Reference Figure 4 As shown, this utility model discloses a second embodiment. The difference between the second embodiment and the first embodiment is that an inverted U-shaped base 15 is installed directly above the second cylinder in the rotating frame, and a fourth cylinder (cylinder body 10) is installed on the base. During installation, care must be taken to ensure that it is parallel and in the same direction as the opening of the second cylinder below. The small balls in the two cylinders (cylinder body 4 and cylinder body 2) have equal speeds during rotation. Therefore, this improvement is used to achieve projectile motion of small balls with the same initial velocity at different heights. (Note: Later experiments proved that a small square cylinder is better, as it is less likely to roll inside the cylinder and change the projectile height; therefore, it will be referred to as a small square cylinder in the following text.)

[0041] Reference Figure 5As shown, based on the second embodiment, a second base plate 13 is seamlessly connected to the side of the base plate near the rotating frame via slots and bolts. A trapezoidal blocking frame 12 is then installed to simultaneously stop the rotating frame and the two small square tubes (tube two and tube four) on the base. This allows the small balls in the two small square tubes to leave the tubes simultaneously. The upper ball undergoes projectile motion, while the lower ball moves in uniform linear motion on the base plate. Note that lubricating oil should be applied to the upper surface of the base plate so that when the small steel ball flies out from the lower small square tube of the rotating frame, it can smoothly transition to the seamlessly connected oiled base plate and slide without friction. The two connected base plates are leveled using a level, so that when the small steel ball slides on the oiled base plate with a certain initial velocity, it can be considered as undergoing uniform linear motion.

[0042] The specific production requirements are as follows:

[0043] First, make the base plate. Cut an acrylic sheet that is 800mm long, 600mm wide, and 10mm thick to use as the base plate. Carve a small round hole with a diameter of 30.00mm in the corner of the long side of the base plate. This is to allow the ball to fall freely.

[0044] Second, construct the rotating frame. Cut a piece of acrylic sheet 100mm wide, 600mm long, and 10mm thick to make the rotating frame. Separately, cut three more acrylic sheets, each 250mm long, 100mm wide, and 10mm thick, to make inverted U-shaped bases and fix them to the rotating frame. (See...) Figure 4 )

[0045] Third, connect the base plate and the rotating frame. Install a small metal ball bearing as a pivot on the edge of the base plate near the long side, so that the base plate and the rotating frame are connected by stacking them one on top of the other. The axis of the pivot is located at one-third of the distance from the rotating frame, so that the rotating frame can rotate freely on the base plate.

[0046] Fourth, make small square tubes. These small square tubes are used to hold small steel balls or small plastic balls. Figure 3 The first embodiment uses small cylinders, but in the second embodiment, small square cylinders are more effective. This prevents the small balls inside the cylinders from being thrown outwards and changing their horizontal height when the rotating frame rotates. Four transparent small square cylinders are made of 3.00mm thick acrylic sheet. Three of these cylinders are fixed to the rotating frame on one side at two-thirds of its length, and the fourth is fixed to the upper layer of acrylic sheet on the "inverted U" shaped base of the rotating frame. The openings of the four small square cylinders are horizontal and face the same direction. The two corresponding small square cylinders on the upper and lower layers must be aligned vertically and have the same distance from the axis of rotation.

[0047] The depth of these four small tubes is approximately 1.2 to 1.5 times the radius of the small steel ball, minimizing the sliding distance the ball travels when entering and exiting. The width and height of the tubes are slightly larger than the diameter of the steel ball by about 0.2 mm, ensuring the ball can move freely without being too loose within the tubes. It is crucial that the bottoms of all the tubes are level to ensure the initial velocity of the steel ball when it exits is horizontal.

[0048] Fifth, install a rotating handle. Install a rotating handle on one-third of the length of the rotating frame. The position of the rotating shaft, the center of the three small square tubes, and the position of the handle should be as straight as possible. The experimenter can control the rotation speed of the rotating frame by adjusting the force of the rotating handle.

[0049] Sixth, install a stop post or blocking frame 12. In the first embodiment, a stop post made of acrylic sheet is fixed to the edge of the base plate, while in the second embodiment, the stop post is replaced with a blocking frame. Its function is to cause the rotating frame and base to suddenly stop rotating when they hit the stop post when they reach a position parallel to the long side of the base plate. In this way, the small steel balls or small plastic balls placed in all the small square tubes will be thrown forward simultaneously due to inertia. Since the distance between the small square tubes on the rotating frame and the axis of rotation is different, the small steel balls in the tubes will be thrown horizontally from the same height towards the outside of the base plate with different initial velocities.

[0050] Seventh, install the clamp 9 and a pull-out small plate 11. Fix a long-tailed hard plastic clamp above the small hole 16 cut on one side of the base plate, leaving a 10mm gap between the clamp and the base plate. This gap allows for the placement of a small plate to elevate the ball, ensuring that the freely falling ball is at the same height as the ball projected horizontally on the rotating frame, and also making it easy to clamp the small steel ball with the clamp. Before the experiment, use the small plate to elevate the small steel ball over the small hole and clamp it with the clamp. Then pull out the small plate and rotate the rotating frame to make it strike the long-tailed clamp. When the clamp releases, the small steel ball can fall freely from the small hole to the floor.

[0051] Key points for successful construction: (1) Ensure that all the small square tubes containing steel balls on the rotating frame and base are horizontal, so that the small steel balls will undergo projectile motion when they fly out of the tubes. (2) Ensure that the small square tubes above and below the rotating frame and base can stop simultaneously when they hit the trapezoidal stop frame, so that the initial velocity of the small steel balls in the upper and lower square tubes is the same when they rush out of the small square tubes. (3) Ensure that the opening direction of the four small square tubes is consistent, and that the outer walls of the corresponding small square tubes are aligned vertically and vertically, with the same distance from the axis of rotation, so that the initial velocity of the two small steel balls in the upper and lower small square tubes is consistent. (4) Ensure that the horizontal base plate of the small square tube directly below the base can be seamlessly and smoothly connected, so that the small balls in the lower small square groove will not encounter significant resistance when they rush out.

[0052] Experimental demonstrations and effects that can be achieved in teaching:

[0053] This experiment still employs the comparative experimental method. The principle is based on the fact that coaxial circular motion has equal angular velocities, and that the linear velocity is greater further from the axis of rotation, while the linear velocities are the same at the same distance from the axis. It also utilizes Newton's first law, which states that an object on a smooth horizontal surface, when subjected to zero net external force, will maintain its original velocity and move in uniform rectilinear motion due to inertia.

[0054] (a) Verify that the time of projectile motion is independent of the magnitude of the initial velocity but depends on the height of the fall.

[0055] First, such as Figure 6 Place the device on the edge of a horizontal table and control the falling height to be the same. Place three small balls in three small square tubes on three rotating frames. Rotate the rotating frames and then brake them to allow the three small balls with different initial velocities to be thrown horizontally from the same height at the same time. Teachers and students can distinguish whether the three balls land at the same time by listening to the sound of them hitting the ground, or they can use the slow motion function of their mobile phones to record high-speed video to observe.

[0056] In the experiment, the three balls were positioned at different distances from the phone, so visually the line connecting the three balls did not appear parallel to the table base opposite. However, observing the timing of the balls' bounces upon landing in the video, it was virtually impossible to tell the order. Judging whether they landed simultaneously by listening to the sound of their impact would yield a better result.

[0057] Secondly, the teacher kept the falling height of the ball constant while changing the speed of the handle rotation, thus changing the initial velocity of the ball, and repeated the experiment. The three balls still landed with only one sound, further demonstrating that the throwing time of the three balls was the same.

[0058] Furthermore, the teacher can raise or lower one side of the device's base so that the three small square tubes are at different heights. By turning the handle, the three small balls on the rotating frame are thrown horizontally from different heights. At this time, the teacher and students can hear that the sounds of the three balls landing are distinctly sequential. This shows that when the falling height of the projectile motion is different, the time of the projectile motion is also different.

[0059] By controlling variables and repeating the experiment, and using a comparative experimental method, students can be convinced that the time of projectile motion is independent of the magnitude of the initial velocity, but rather depends on the height of the fall. This effectively overcomes the teaching difficulty of projectile motion.

[0060] (ii) Demonstrate that projectile motion and free fall at the same height are isochronous.

[0061] Before demonstrating this experiment, the teacher can guide students to deduce from the conclusion of the first demonstration experiment: since the time for projectile motion at the same height but with different velocities is the same, meaning the time of projectile motion is independent of the initial velocity, then if the initial velocity of the projectile becomes zero, it can be deduced that the time for free fall motion at the same height and projectile motion should also be the same. After reaching this conclusion, the teacher and students can then conduct an experiment to verify it. This step helps the teacher cultivate students' reasoning abilities.

[0062] During the demonstration, first push the small plate under the clamp, place a small ball in the small cylinder, and then clamp it with the clamp. Then remove the small plate. This ensures the small ball is initially at the same height as any ball in a small cylinder on the rotating frame. Finally, place a small ball in a small cylinder on the rotating frame. When the rotating frame is rotated and the tail of the long-tail clamp is struck to brake, the clamp immediately opens, allowing the held ball to fall freely. Simultaneously, the ball in the small cylinder on the rotating frame is launched horizontally with a certain initial velocity due to inertia. Teachers and students can determine how many balls land simultaneously by listening to the sound of them hitting the ground.

[0063] (iii) Demonstrate that projectile motion and horizontal component motion are simultaneous.

[0064] Seamlessly connect another acrylic plate coated with lubricant to the base plate. Lock and fix the two plates on a level table. After checking the level with a level, you can begin the demonstration.

[0065] A small steel ball is placed inside two small square tubes, one on the upper level and the other on the lower level, at the same distance from the axis of rotation on the inverted U-shaped base of the rotating frame. The frame is then rotated. After the frame stops, the steel ball on the upper level of the inverted U-shaped base flies out and undergoes projectile motion, while the steel ball on the lower level maintains its original velocity and moves to a uniform linear motion on an oiled horizontal acrylic plate. Since the two balls have the same initial velocity and the net external force acting on them in the horizontal direction is almost zero, their motion along the direction of their initial velocity is the same, and they eventually collide on the oiled plate.

[0066] In this experiment, the collision could not be observed with the naked eye or heard with the sound of the collision. Therefore, the "slow motion" function of a mobile phone was used to record a video of the two balls' movement, which was then immediately projected onto a screen for playback. The slow-motion video clearly shows that, regardless of whether the shot was taken from a top-down angle or a side-view angle with the rotating frame, the two balls collided on the oiled acrylic plate. By pausing the video, it was also possible to observe that the vertical movement of the two small steel balls was synchronized.

[0067] By changing the rotation speed and continuing to record the motion of the two balls using the phone's "slow motion" function, the collision can still be seen in the video playback, and the collision locations are different, indicating that the collision was definitely not pre-designed. This fully demonstrates the isochronism between projectile motion and uniform horizontal linear motion with the same initial velocity. Since the balls undergoing uniform linear motion do not have a predetermined trajectory, and the collision location is uncertain, it is entirely due to their identical initial velocity in the horizontal direction. Such experimental results have higher credibility.

[0068] Through repeated practical testing, the improved experimental setup enables students to more deeply understand that the time of projectile motion is not related to the magnitude of the initial velocity, but is determined by the height of the fall. It also helps students better understand that the vertical component of projectile motion is free fall, while the horizontal component is uniform linear motion.

[0069] The improved experimental setup is easier for teachers and students to operate; simply place the device on a horizontal table for demonstration. By adding a controlled variable method to the comparative experiment, the improved setup enriches the experimental content, enhances the repeatability and stability of the results, and greatly improves the reliability of the experiment.

[0070] The improved device described above can be integrated into a base plate, which can demonstrate the simultaneity of projectile motion and vertical component motion, as well as the simultaneity of projectile motion and horizontal component motion, so that one set of experimental equipment can demonstrate two experiments.

[0071] If this device can be mass-produced in the future, the height of the base on the rotating frame can be made adjustable, and the opening direction of the small square tubes on the upper and lower layers of the base can also be made variable, which can further increase the number of variables and increase the reliability of the experiment.

[0072] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A device for demonstrating the isochronism of parabolic motion, characterized in that it comprises: It includes a base plate (1) and a rotating frame (2). The rotating frame (2) is rotatably connected to the base plate (1). A handle (3) is provided on one side of the rotating frame (2) with the connection between the rotating frame (2) and the base plate (1) as the boundary, and a cylinder assembly is provided on the other side. An end seat (4) is also provided on the side of the base plate (1) with the cylinder assembly. A cylinder five is installed on the end seat (4). A channel is provided on the base plate to allow the small ball in the cylinder five to fall freely.

2. The integrated demonstration device for isochronous projectile motion according to claim 1, characterized in that, The cylindrical assembly and the fifth cylindrical body are small cylindrical or small square cylinders. The cylindrical assembly includes a first cylindrical body (6), a second cylindrical body (7), and a third cylindrical body (8).

3. The integrated demonstration device for isochronous projectile motion according to claim 2, characterized in that, The rotating frame (2) is connected to the base plate (1) via a rotating shaft (14). With the installation position of the rotating shaft (14) as the boundary, a handle is installed on one side of the rotating frame, and cylinder one (6), cylinder two (7), and cylinder three (8) are installed on the other side.

4. The integrated demonstration device for isochronous projectile motion according to claim 1, characterized in that, A clamp (9) is installed on the lower side of the cylinder (5), and a small, removable plate (11) is also installed below the clamp (9). The small plate (11) is located at the upper part of the free fall channel. The thickness of the small plate (11) is the height of the lower edge of the cylinder (5) to the bottom plate (1). The free fall channel is a small hole (16).

5. The integrated demonstration device for isochronous projectile motion according to claim 3, characterized in that, An inverted U-shaped base (15) is provided directly above the second cylinder (7) in the rotating frame (2), and a fourth cylinder (10) is installed on the base (15). The fourth cylinder (10) is parallel to and in the same direction as the opening of the second cylinder (7).

6. The integrated demonstration device for isochronous projectile motion according to claim 5, characterized in that, A second base plate (13) is seamlessly connected to the side of the base plate (1) near the rotating frame (2) via slots and bolts. A blocking component is provided on the second base plate (13) so that the two corresponding cylinders on the rotating frame (2) and the base (15) can stop moving simultaneously.

7. The integrated demonstration device for isochronous projectile motion according to claim 6, characterized in that, The blocking component is a stop post or a blocking frame (12).

8. The integrated demonstration device for isochronous projectile motion according to claim 7, characterized in that, The upper surface of the second base plate (13) is coated with lubricating oil.

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