Inclined plane movement overweight and weightlessness demonstration instrument

Abstract

The utility model relates to a slope motion overweight and weightlessness demonstration instrument, which comprises a base (1), a sliding component (2), a fixed pulley (3), a pull rope (4) and a hook weight (5), a smooth slope (11) is arranged on the base (1), the sliding component (2) is arranged on the smooth slope (11) of the base (1) and is in sliding fit with the base (1), the fixed pulley (3) is rotatably arranged on the base (1), the pull rope (4) is matched with the fixed pulley (3), one end of the pull rope (4) is connected with the sliding component (2), and the hook weight (5) is connected with the hook weight (5). One end of the sliding component (2) is connected with a base (1), the other end of the sliding component (2) freely overhangs vertically downwards and is connected with a plurality of hook weights (5), a pressure sensor (6) is arranged on the top surface of the sliding component (2), a storage tray (61) is arranged on the top surface of the pressure sensor (6), and a pressure display (7) connected with the pressure sensor (6) through a wire is arranged on the sliding component (2). According to the utility model, the defects of the existing physics teaching material in overweight and weightlessness demonstration can be made up, and overweight and weightlessness phenomena can be visually demonstrated not only when an object moves in the vertical direction, but also when the object moves in the inclined plane direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to a physical teaching aid, concretely relates to a demonstration instrument of supergravity and weightlessness of inclined plane motion. BACKGROUND

[0002] Supergravity and weightlessness are the typical application of Newton's second law, but in the current high school physics textbook, there are fewer experiments related to supergravity and weightlessness in this chapter, and only through the scene of people riding elevators, the force analysis of people is carried out, and the definition of supergravity and weightlessness is directly explained to students. It is easy for students to mistakenly believe that objects only have supergravity and weightlessness phenomenon in the vertical direction, which leads to a certain degree of limitation and misunderstanding of students in applying this part of knowledge. SUMMARY

[0003] The utility model aims at providing a demonstration instrument of supergravity and weightlessness of inclined plane motion, so that students can more comprehensively understand the definition of supergravity and weightlessness, and avoid the limitation and misunderstanding of students in understanding supergravity and weightlessness.

[0004] The technical solution of the utility model is as follows: it includes base, sliding part, fixed pulley, pull rope and hook code, the base is provided with a smooth inclined plane inclined to the horizontal direction, the sliding part is arranged on the smooth inclined plane of the base and is in sliding fit with the base along the extension direction of the smooth inclined plane, the fixed pulley is rotatably installed on the base above the highest point of the smooth inclined plane, the part between the two ends of the pull rope is matched with the fixed pulley, one end is connected with the sliding part along the smooth inclined plane obliquely downward, and the other end is vertically downward and freely suspended and is connected with a plurality of hook codes, the top surface of the sliding part is provided with a pressure sensor, the top surface of the pressure sensor is provided with a placing disc, and the sliding part is provided with a digital pressure display connected with the pressure sensor through wires.

[0005] The technical effect of the utility model is that it can make up for the deficiency of existing physical teaching materials in demonstrating supergravity and weightlessness, can directly demonstrate that objects will have supergravity and weightlessness phenomenon not only in the vertical direction, but also in the inclined direction, so that students can more comprehensively understand the definition of supergravity and weightlessness, avoid the limitation and misunderstanding of students in understanding supergravity and weightlessness, and improve the ability of students in understanding physical concepts through experiments. BRIEF DESCRIPTION OF DRAWINGS

[0006] Figure 1 It is a three-dimensional structure diagram of the utility model embodiment. DETAILED DESCRIPTION

[0007] As Figure 1As shown, it comprises a base 1, a sliding part 2, a fixed pulley 3, a pull rope 4 and a hook 5. The base 1 is provided with a smooth inclined surface 11 inclined to the horizontal direction. The sliding part 2 is arranged on the smooth inclined surface 11 of the base 1 and is in sliding fit with the base 1 along the extending direction of the smooth inclined surface 11. The fixed pulley 3 is rotatably arranged on the base 1 above the highest point of the smooth inclined surface 11. The pull rope 4 is in fit with the fixed pulley 3 at the portion between the two ends of the pull rope 4. One end of the pull rope 4 is connected with the sliding part 2 along the smooth inclined surface 11 and the other end of the pull rope 4 is vertically downwardly freely suspended and is provided with a plurality of hooks 5. The top surface of the sliding part 2 is provided with a pressure sensor 6. The top surface of the pressure sensor 6 is provided with a placing disc 61. The sliding part 2 is provided with a pressure display 7 connected with the pressure sensor 6 through a wire.

[0008] The surface of the sliding part 2 in sliding fit with the smooth inclined surface 11 is a smooth surface so as to reduce the friction between the sliding part 2 and the base 1.

[0009] The base 1 is provided with limiting strips 12 on both sides of the smooth inclined surface 11 to limit the sliding direction of the sliding part 2. The side surface of each limiting strip 12 in fit with the sliding part 2 and the side surface of the sliding part 2 in fit with the two limiting strips 12 are smooth surfaces so as to reduce the friction between the sliding part 2 and the limiting strips 12.

[0010] The base 1 is provided with damping blocks 13 at the upper and lower ends of the smooth inclined surface 11 to serve as buffers for the sliding part 2. The damping blocks 13 are elastic rubber blocks.

[0011] The pressure sensor 6 is arranged on the top surface of the sliding part 2. The placing disc 61 is arranged on the top surface of the pressure sensor 6. The pressure sensor 6 is used to measure the supporting force of the placing disc 61 on the object placed on the placing disc 61. The pressure display 7 is arranged on the side surface of the sliding part 2 and is used to display the supporting force of the placing disc 61 on the object placed on the placing disc 61.

[0012] The pressure sensor 6 and the pressure display 7 use dry batteries or rechargeable batteries as power supply.

[0013] The pull rope 4 is a soft rope.

[0014] The upper and lower ends of the hook 5 are respectively provided with hooks for facilitating the connection between the hooks 5.

[0015] The base 1 is a side view right triangle body with the bottom edge parallel to the horizontal plane, the vertical edge perpendicular to the horizontal plane and the inclined edge inclined to the horizontal plane. The bottom surface of the base 1 is a rectangular horizontal plane. The two right triangle side surfaces are parallel to each other and perpendicular to the bottom surface. The other rectangular side surface is perpendicular to the bottom surface and the two right triangle side surfaces. The top surface of the base 1 is a rectangular plane perpendicular to the two right triangle side surfaces and inclined to the bottom surface and the rectangular side surface, forming the smooth inclined surface 11 of the base 1.

[0016] The sliding component 2 is a right triangle body with its top side parallel to the horizontal plane, its vertical side perpendicular to the horizontal plane, and its inclined side inclined to the horizontal plane. The top surface of the sliding component 2 is a rectangular horizontal plane, the two right triangle side vertical planes are parallel to each other and perpendicular to the top surface, and the other rectangular side vertical plane is perpendicular to the top surface and the two right triangle side vertical planes. The bottom surface of the sliding component 2 is a rectangular plane perpendicular to the two right triangle side vertical planes and inclined to the top surface and the rectangular side vertical plane, forming a sliding surface matched with the smooth inclined surface 11.

[0017] Demonstration method:

[0018] I. Demonstration of placing objects:

[0019] 1. Static measurement: Place the sliding component 2 on the smooth inclined surface 11 of the base 1, and place an object with appropriate weight on the object placing disc 61. Control the sliding component 2 to keep it stationary. At this time, the reading of the pressure display 7 is the static support force of the object placing disc 61 on the object.

[0020] 2. Weightlessness demonstration: Place the sliding component 2 at the uppermost end of the smooth inclined surface 11 of the base 1, and hang a suitable number of hook weights 5 on the vertically downward free hanging end of the pull rope 4. Release the sliding component 2, allowing it to move downward along the smooth inclined surface 11 at a uniform acceleration. At this time, the reading displayed by the pressure display 7 is a value less than the static support force. This illustrates that when the object moves downward along the smooth inclined surface 11 with the sliding component 2 at a uniform acceleration, weightlessness occurs.

[0021] 3. Superweight demonstration: Place the sliding component 2 at the lowermost end of the smooth inclined surface 11 of the base 1, and hang a suitable number of hook weights 5 (more than in the weightlessness demonstration) on the vertically downward free hanging end of the pull rope 4. Release the sliding component 2, allowing it to move upward along the smooth inclined surface 11 at a uniform acceleration. At this time, the reading displayed by the pressure display 7 is a value greater than the static support force. This illustrates that when the object moves upward along the smooth inclined surface 11 with the sliding component 2 at a uniform acceleration, superweight occurs.

[0022] II. Demonstration without placing objects:

[0023] 1. Static measurement: Without placing an object on the object placing disc 61, place the sliding component 2 on the smooth inclined surface 11 of the base 1 to keep it stationary. At this time, the reading of the pressure display 7 is the static support force when no object is placed on the object placing disc 61.

[0024] 2. Weightlessness demonstration: Place the sliding component 2 at the uppermost end of the smooth inclined surface 11 of the base 1, and hang a suitable number of hook weights 5, allowing the sliding component 2 to move downward along the smooth inclined surface 11 at a uniform acceleration. At this time, the pressure display 7 will display a value less than the static support force.

[0025] 3、Super-demonstration: Put the sliding component 2 at the bottom of the smooth slope 11 of the base 1, hang the appropriate number of hook codes 5, so that the sliding component 2 moves uniformly accelerated along the smooth slope 11, at this time the pressure display 7 will show a value greater than the static support force.

[0026] No demonstration instructions, even if not in the object 61 on the shelf, the sliding component 2 along the smooth slope 11 oblique downward uniform acceleration will occur weightlessness phenomenon, oblique upward uniform acceleration will also occur super weight phenomenon.

[0027] The advantages of this demonstration instrument:

[0028] 1、Can directly demonstrate the super weightlessness phenomenon that occurs when the object moves uniformly accelerated along the slope direction;

[0029] 2、The base 1 and the sliding component 2 are hollow structures, light and portable;

[0030] 3、Using pressure sensor 6 and pressure display 7, the measurement value is accurate, and the change of support force during the object experiment can be displayed in real time, which is convenient for observation.

Claims

1. An inclined plane motion overgravity and weightlessness demonstration device, comprising a base (1), a sliding component (2), a fixed pulley (3), a pull rope (4), and weights (5), characterized in that: The base (1) is provided with a smooth inclined surface (11) inclined to the horizontal direction, the sliding component (2) is arranged on the smooth inclined surface (11) of the base (1) and is in sliding fit with the base (1) along the extending direction of the smooth inclined surface (11), the fixed pulley (3) is rotatably arranged on the base (1) above the highest point of the smooth inclined surface (11), the part between the two end portions of the pull rope (4) is matched with the fixed pulley (3), one end is connected with the sliding component (2) along the smooth inclined surface (11) and is inclined downward, the other end is vertically downward and freely hangs and is provided with a plurality of hooks (5), the top surface of the sliding component (2) is provided with a pressure sensor (6), the top surface of the pressure sensor (6) is provided with a placing disc (61), and the sliding component (2) is provided with a pressure display (7) connected with the pressure sensor (6) through a wire.

2. The slope motion super-weight and weightlessness demonstration device according to claim 1, characterized in that The sliding surface of the sliding component (2) matched with the smooth inclined surface (11) is a smooth surface.

3. The slope motion super-weight and weightlessness demonstration device according to claim 1, characterized in that The base (1) is provided with limiting strips (12) on both sides of the smooth inclined surface (11) to limit the sliding direction of the sliding component (2), the side surface matched with the sliding component (2) and the side surface matched with the two limiting strips (12) are smooth surfaces.

4. The slope motion hypergravity and weightlessness demonstration device of claim 1, wherein the slope is a slope of a ramp. The base (1) is provided with damping blocks (13) at the upper and lower ends of the smooth inclined surface (11) to buffer the sliding component (2).

5. The slope motion super-weight and weightlessness demonstration device according to claim 4, characterized in that The damping blocks (13) are elastic rubber blocks.

6. The slope motion super-weight and weightlessness demonstration device of claim 1, wherein the slope is formed by a plurality of slope plates. The pressure sensor (6) is arranged on the top surface of the sliding component (2), the placing disc (61) is arranged on the top surface of the pressure sensor (6), and the pressure display (7) is arranged on the side surface of the sliding component (2).

7. The slope motion super-weight and weightlessness demonstration device of claim 1, wherein the slope is formed by a plurality of slope plates. The pressure sensor (6) and the pressure display (7) use dry batteries or rechargeable batteries as power sources.

8. The slope motion super-weight and weightlessness demonstration device of claim 1, wherein the slope is formed by a plurality of slope plates. The upper and lower ends of the hook (5) are respectively provided with hooks for facilitating the connection between the hooks (5).

9. The slope motion super-weight and weightlessness demonstration device of claim 1, wherein the slope is formed by a plurality of slope plates. The base (1) is a side view right triangle body with the bottom edge parallel to the horizontal plane, the vertical edge perpendicular to the horizontal plane and the inclined edge inclined to the horizontal plane, the bottom surface of the base (1) is a rectangular horizontal plane, the two right triangle side surfaces are parallel to each other and perpendicular to the bottom surface, and the other rectangular side surface is perpendicular to the bottom surface and the two right triangle side surfaces, the top surface of the base (1) is a rectangular plane perpendicular to the two right triangle side surfaces and inclined to the bottom surface and the rectangular side surface, and the smooth inclined surface (11) is formed.

10. The slope motion super-weight and weightlessness demonstration device of claim 1, wherein the slope is formed by a plurality of slope plates. The sliding component (2) is a side view right triangle body with the top edge parallel to the horizontal plane, the vertical edge perpendicular to the horizontal plane and the inclined edge inclined to the horizontal plane, the top surface of the sliding component (2) is a rectangular horizontal plane, the two right triangle side surfaces are parallel to each other and perpendicular to the top surface, and the other rectangular side surface is perpendicular to the top surface and the two right triangle side surfaces, the bottom surface of the sliding component (2) is a rectangular plane perpendicular to the two right triangle side surfaces and inclined to the top surface and the rectangular side surface, and the sliding surface matched with the smooth inclined surface (11) is formed.

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