Uniform variable motion demonstrator

Abstract

The utility model discloses a uniform variable motion demonstrator, which belongs to the technical field of science popularization teaching equipment and comprises a demonstration platform. The front end and the rear end of the trolley are respectively connected with the power structure and the heavy hammer through steel wires; a preset number of sound production structures are arranged above the slide way, and an impact hammer for impacting the sound production structures is arranged at the top of the trolley; the power structure comprises a motor and a one-way bearing arranged at the output end of the motor, and the one-way bearing is connected with the trolley through a steel wire. The beneficial effects of the utility model are that the relation between time and distance in uniform variable motion can be more visually displayed from sound and object images; the trolley is reset under traction of the one-way bearing driven by the motor, accidents caused by manual traction are avoided, resistance is avoided as far as possible when the heavy hammer freely falls, and steel wires can be wound through the one-way bearing when the trolley is reset.

Description

Technical fields:

[0001] This utility model belongs to the field of science popularization and teaching equipment technology, and more specifically relates to a uniformly accelerated motion demonstrator. Background technology:

[0002] The magnitude of an object's acceleration is directly proportional to the force acting upon it, inversely proportional to its mass, and directly proportional to the reciprocal of its mass; the direction of the acceleration is the same as the direction of the force. This law was proposed by Newton in his 1687 book, *Mathematical Principles of Natural Philosophy*. Newton's second law of motion, together with his first and third laws, constitutes Newton's laws of motion, which explain the fundamental laws of motion in classical mechanics.

[0003] The experiment on Newton's second law of motion is a very basic and necessary verification experiment in physics. It involves the fundamental approach and method of verifying a physical law or principle, and therefore, there are often special requirements for the accuracy of the experiment.

[0004] Currently, the main experimental verification methods for Newton's second law of motion in secondary school curricula include the ticker timer method, verification on an air track, and verification using nonlinear regression. Among these, the ticker timer method is a compulsory course in secondary school.

[0005] Specifically, when studying the relationship between the acceleration of a system and its mass and tension, a ticker timer is fixed to one end of a wooden board. Weights and a cart are attached to the two ends of a thin string, which passes over a pulley. The weight of the weights acts as the tension, allowing the cart, which pulls a paper tape, to move on a flat plane. The cart, the weights on it, and the hook attached to the other end of the string constitute a motion system. By observing the spacing of the tickers and the duration of the timer, the relationship between time and distance in uniformly accelerated motion can be understood to some extent.

[0006] However, the device cannot be reset, and manually pulling the hammer could easily cause injury, posing a safety hazard. Utility Model Content:

[0007] To solve the above problems and overcome the shortcomings of the existing technology, this utility model provides a uniformly accelerated motion demonstrator;

[0008] The first technical problem to be solved is: verifying Newton's second law of motion using the ticker timer method. By observing the spacing of the tickers and the duration of the timer, the relationship between time and distance in uniformly accelerated motion can be understood to some extent. However, the device cannot be reset properly, and the weight can easily injure people, posing a safety hazard.

[0009] The specific technical solution of this utility model to solve the above-mentioned technical problems is as follows: the uniformly accelerated motion demonstrator includes a demonstration platform; characterized in that: a slide rail is provided on the upper surface of the demonstration platform, and a trolley is slidably connected on the slide rail.

[0010] One end of the slide is equipped with a power structure for resetting the trolley, and the other end of the slide is equipped with a weight that pulls the trolley to move at a uniform speed on the slide; the front and rear ends of the trolley are connected to the power structure and the weight respectively by steel wires.

[0011] A preset number of sound-generating structures are installed above the slide, and an impact hammer with an impact sound-generating structure is installed on the top of the trolley.

[0012] The power structure includes a motor and a one-way bearing located at the output end of the motor. The one-way bearing is connected to the trolley via a steel wire.

[0013] Furthermore, the sound-generating structure is a bell, which is hinged to the bracket, and the bracket is fixed to the side wall of the slide.

[0014] Furthermore, the trolley, pulled by the weight, strikes the bell with an impact hammer.

[0015] Furthermore, the trolley is reset under the traction of a one-way bearing driven by a motor.

[0016] Furthermore, the ratio of the distance between the preset number of sound-generating structures and the origin is: 1:4:9:……:(1+N). 2 N is an integer not less than 2.

[0017] The beneficial effects of this utility model are:

[0018] One advantage of this invention is that it provides a uniformly accelerated motion demonstrator, which creatively introduces a hammer striking a bell at equal intervals to replace the timer in the dot-timer verification method used in middle school teaching; the distance is displayed by replacing the dot spacing with the distance between the sound-generating structure and the origin, which more intuitively shows the relationship between time and distance in uniformly accelerated motion from the sound and the image.

[0019] One advantage of this invention is that it provides a power structure that uses a motor-driven one-way bearing to reset the trolley, avoiding accidents caused by manual pulling. More importantly, by utilizing the principle of the one-way bearing, the weight can be minimized from encountering resistance during free fall, and the steel wire can be wound up through the one-way bearing when resetting the trolley. Attached image description:

[0020] Appendix Figure 1 This is a schematic diagram of the structure of this utility model; in the attached drawing:

[0021] 1. Demonstration platform; 2. One-way bearing; 3. Motor; 4. Impact hammer; 5. Trolley; 6. Support; 7. Bell; 8. Slide rail; 9. Steel wire; 10. Weight. Detailed implementation method:

[0022] In the description of this utility model, it should be understood that the terms "center," "upper," "lower," "left," "right," "rear," "lower left," "upper right," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] The specific embodiment of this utility model is as follows: The uniformly accelerated motion demonstrator includes a demonstration platform 1; characterized in that: a slide rail 8 is provided on the upper surface of the demonstration platform 1, and a trolley 5 is slidably connected to the slide rail 8.

[0024] One end of the slide 8 is equipped with a power structure for resetting the trolley 5, and the other end of the slide 8 is equipped with a weight 10 for pulling the trolley 5 to move at a uniform speed on the slide 8; the front and rear ends of the trolley 5 are connected to the power structure and the weight 10 respectively by steel wires 9.

[0025] Preferably, the power structure includes a motor 3 and a one-way bearing 2 disposed at the output end of the motor 3. The one-way bearing 2 is connected to the trolley 5 via a steel wire 9. The trolley 5 is reset under the traction of the one-way bearing 2 driven by the motor 3.

[0026] A predetermined number of sound-generating structures are arranged above the slide 8, and an impact hammer 4 of the impact sound-generating structure is arranged on the top of the trolley 5; preferably, the sound-generating structure is a bell 7, which is hinged to a bracket 6, and the bracket 6 is fixed to the side wall of the slide 8. Preferably, the trolley 5 strikes the bell 7 by the impact hammer 4 under the pull of the weight 10.

[0027] It should be noted that this utility model is a uniformly accelerated motion demonstrator. In specific operation,

[0028] 1. The weight 10 undergoes free fall due to gravity, thus pulling the cart 5 along the slide 8 at a uniformly accelerated speed.

[0029] The preset ratio of the distance between the number of sound-generating structures and the origin is: 1:4:9:……:(1+N). 2 N is an integer not less than 2. In this way, the time interval between the impact hammer 4 of the trolley 5 striking the bell 7 of the sound-generating structure is the same, thus showing the relationship between time and distance in uniformly accelerated motion more intuitively from the sound and the image.

[0030] 2. When the trolley resets, the inner ring of the one-way bearing 2 connected to the output end of motor 3 is engaged. When driven by the motor, the one-way bearing 2 enables the outer ring to reverse and self-lock, thus allowing the trolley to be reset under the traction of the motor-driven one-way bearing, preventing accidents caused by manual pulling.

[0031] 3. After the trolley is reset, the positive force of the one-way bearing 2 disappears, the reverse self-locking of the outer ring is released, and the weight 10 falls freely due to gravity, thereby pulling the trolley 5 to move at a uniform speed on the slide 8. By utilizing the principle of the one-way bearing, the weight can be subjected to as little resistance as possible when it falls freely, and the steel wire can be wound up through the one-way bearing when the trolley is reset.

[0032] One-way bearing 2 is existing technology, and its working principle will not be elaborated here.

[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. 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 uniformly accelerated motion demonstrator, comprising a demonstration platform (1); characterized in that: The upper surface of the demonstration platform (1) is provided with a slide rail (8), and a trolley (5) is provided on the slide rail (8) through a sliding connection. One end of the slide (8) is equipped with a power structure for resetting the trolley (5), and the other end of the slide (8) is equipped with a weight (10) for pulling the trolley (5) to move at a uniform speed on the slide (8); the front and rear ends of the trolley (5) are connected to the power structure and the weight (10) respectively by steel wire (9); A preset number of sound-generating structures are provided above the slide (8), and an impact hammer (4) with an impact sound-generating structure is provided on the top of the trolley (5); The power structure includes a motor (3) and a one-way bearing (2) installed at the output end of the motor (3). The one-way bearing (2) is connected to the trolley (5) by a steel wire (9).

2. The uniformly accelerated motion demonstrator according to claim 1, characterized in that... The sound-generating structure is a bell (7), which is hinged to a bracket (6), and the bracket (6) is fixed to the side wall of the slide (8).

3. The uniformly accelerated motion demonstrator according to claim 2, characterized in that... The trolley (5) is pulled by the hammer (10) and strikes the bell (7) by the impact hammer (4).

4. The uniformly accelerated motion demonstrator according to claim 1, characterized in that... The trolley (5) is reset under the traction of the one-way bearing (2) driven by the motor (3).

5. The uniformly accelerated motion demonstrator according to claim 1, characterized in that... The preset ratio of the distance between the number of sound-generating structures and the origin is: 1:4:9:……:(1+N). 2 N is an integer not less than 2.

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