JP2504542Y2 - Experimental substrate and experimental equipment for learning about pressure - Google Patents

Description

[Detailed description of the device]

[0001]

[Industrial application] The present invention belongs to the field of experimental teaching materials for learning science, and more specifically, relates to an experimental device for learning about the relationship between force and the area on which force acts, that is, pressure. is there.

[0002]

2. Description of the Related Art In order to teach students that the magnitude of force per unit area, that is, the pressure is inversely proportional to the magnitude of the area on which the force acts, it has hitherto been done, for example, on the side of the lead of a pencil. Press the both side and the side that does not come out, which side you feel pain, and the depth of sinking into the snow with and without skiing,
Furthermore, we explain the difference in pain when stepped on with high heels and sneakers, and as a concrete experiment to teach this in science classrooms, for example, a bottle filled with water, In addition, it has been made to be understood by observing the recessed state of the sponge plate in the case of standing up with the bottom side in contact with the case of standing up with the narrow mouth side in contact with.

[0003]

However, in this experiment, even if it is understood that there is a relationship between the pressure, that is, the magnitude of force and the area on which the force acts, the magnitude of force per unit area is large. However, it is not enough to make people understand about pressure, and simple experimental tools and devices used in science classrooms for making them understand have not been provided so far. The present invention was devised as a result of various studies and researches on such points, and in the science classroom, the students themselves experimented that pressure was expressed by the magnitude of force per unit area, The purpose of the present invention is to provide a simple experimental device for doing so.

[0004]

In order to achieve the above object, in the present invention, since the size of the weight is proportional to the size of contraction of the spring (coil spring), One end of one sliding member of the basic body made up of the sliding member of the piston and the cylinder that is interposed is flat.
The problem is solved by using an experimental base material on which a weight mounting part having a unit area of cm is formed. That is,
This invention is based on the above experiments substrate, and which of the plurality of sliding members on the side without the weight mounting portion of these experiments substrate
Multiple, consist of a holding means for juxtaposing held so as to form a same plane close Tsumuno portion to each other, and as these holding means, of the sliding member without a Tsumuno portion side It is configured by a base plate in which concaves or convex columns conforming to the cross-sectional shape are provided in a grid pattern, or by a frame body that bundles the sliding members on the side without the weight mounting portion from the outside.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. First, the experimental base material (A) is composed of a sliding member of a piston (b) and a cylinder (c) in which a spring (a) is interposed, and in FIG. A unit area ( 1 square ) at the end of the piston (b) of the sliding member
cm ) square weight placement part (d) is provided, and in FIG. 2, the experimental base material (A ′) is the cylinder (c) in the opposite of the experimental base material (A). A square weight mounting portion (d ') having a unit area is provided at the end of the. Both ends of the spring (a) are engaged with the locking projection (1) at the end of the piston (b) and the locking projection (2) at the closed end inside the cylinder (c), respectively. The piston and cylinder (c). However, it goes without saying that the fitting degree of the piston (b) and the cylinder (c) is such that when the spring (a) is compressed, the air escapes so that even the air is not compressed. Is. The cylinder (c) has a scale (3),
The scale (3) shown in FIG. 1 is arranged from above to below, and the one shown in FIG. 2 is shown from below to above, and the piston (b) has a reference scale (3). ') Is graduated. Conversely, the scale (3) is on the piston (b),
The reference scale (3 ') may be graduated on the cylinder (c). The piston (b) and the cylinder (c) are formed of, for example, a transparent acrylic resin pipe having a circular cross section, and the weight mounting portion (d) is a 1 cm square.

A table shown in FIG. 3 as a holding means for holding a plurality of cylinders (c) of the experimental base material (A) shown in FIG. 1 or a plurality of pistons (b) of the experimental base material (A ′) shown in FIG. The plate (B) is injection-molded with acrylic resin or the like, and the recesses (4) into which the cylinder (c) (or the piston (b) is fitted are provided in a grid pattern.
In the case of holding these cylinders (c) or fitting recesses (5) provided at the ends of the pistons (b), as shown in FIG. 4, a base plate molded of acrylic resin or the like. On the (B ′) surface, convex columns (6) that fit into the fitting concave recesses (5) are provided in a grid pattern. In any case,
At least two concaves (4) or convex pillars (6) provided on the base plate (B) or (B ') are required, and there are four, nine, 16 ... They are arranged in a grid pattern. For the base plate (B) or (B ') in which such concaves (4) or convex columns (6) are arranged side by side in a grid pattern, the experimental base material (A) or (A') When a plurality of them are fitted into the recesses (4) or the convex columns (6) and stood up, the piston (b) or the cylinder (c) end has a square unit area weight placement portion (d). Are configured such that their edges are close to each other and form the same plane. Figure 6
7 and FIG. 7 show the case where the experimental base material (A) in which the weight mounting portion (d) having a unit area is provided at the end portion of the piston (b) is used, and in FIG. With (C), the cylinders (c) are bundled, and the cylinders (c) are fitted into the fitting recesses (7) formed in the base plate (B ″). By doing so, shaking is reduced. Needless to say, the experiment can be performed only by bundling with the frame body (C) .The mounting plate (D) such as a thin acrylic resin shown in Fig. 5 is mounted on the weight mounting portion (d) during the experiment. Then, the weight (E) is placed on this.

Next, the experiment will be described. The experimental base material (A) shown in FIG. 1 has, for example, a piston (b) having a diameter of 7 m.
m, the inner diameter of the cylinder (c) is 8 mm, the weight mounting portion (d) is 10 mm square, the spring (a) has an outer diameter of 7.2 mm, and the length is 50 mm. As shown in FIG. 7, 9 cylinders are arranged side by side, and the cylinders (c) are bundled from the outside with the frame body (C), and the cylinders (c) are fitted into the fitting recesses (7) of the base plate (B ″) to establish the piston (b). )
The weight mounting portions (d) at the ends are juxtaposed side by side with each other to form a square plane. At this time, the reference scale (3 ′) of the piston (b) matches the 0 scale of the scale (3) of the cylinder (c). When 5 g of the weight (E) is placed on the weight placing part (d) of the experimental base material (A) of the unit of the experimental apparatus in such a state, the spring (a) in the cylinder (c) is compressed. Assuming that the reference scale (3 ') of the piston (b) reaches the scale of 5 mm of the cylinder (c), the spring (a) is contracted by 5 mm by the weight (E) of 5 mm.

Next, a thin placing plate (D) is placed over the two weight placing portions (d), and a 5 g weight (E) is placed on this, and the reference scale (3 ') is placed. Stops at the scale of 1.25 mm. Further, the weight (E) of 10 g is the weight mounting portion (d).
When the number is one, it is 10 mm, when it is two, it is 5 mm, when it is four, it is 2.5 mm, and the stopping position with respect to the scale (3) of the reference scale (3 ′) is different, and the contraction size of the spring (a) is different. different. That is, when the weight (E) having the same weight is mounted on the weight mounting portion (d) of one unit, the weight of the spring (a) contracts to the weight mounting portion (d) of two units. The size of contraction of the spring (a) when it is placed on the table is 1/2. This means that if the area where the weight (E) works is doubled with respect to the weight (E) of the same weight, the size of contraction of the spring (a) becomes 1/2. That is, even if the weights (E) of the same weight have only one mounting portion (d),
When the number of springs is two and the number of springs is four, the contraction size of the spring (a) is as small as 1, 1/2 and 1/4. Thus, even with the same pushing force, the magnitude of the pushing force per unit area differs depending on the area receiving it, and the pressure is represented by the magnitude of the pushing force per unit area. Strictly speaking, if the placing plate (D) is placed, the contraction of the spring (a) is affected by the weight of the placing plate (D), but it is extremely small per unit area. Therefore, it does not matter so much in order to teach that the pressure is inversely proportional to the size of the area where the force acts. This can also be solved by preparing and using a mounting plate having a unit area.

[0009]

[Effect of the Invention] The present invention relates to the relationship between the force and the area on which the force acts,
That is, the structure as an experimental base material for learning about pressure has a unit area of one sliding member of the basic body consisting of a sliding member of a piston and a cylinder with a spring interposed therein. Since it is provided with a weight mounting part, it has a relatively simple structure and does not become too bulky during use and storage. Since it is performed by combining it with a holding means for holding it, it can be used as a mounting surface of a size arbitrarily selected according to the size of the weight. Moreover, since the combination of the unit experiment base material and the holding means is simple, the students can easily experiment in the science classroom, and various experiments can be performed by the combination of the weight size and the mounting surface. Yes, students can have fun experimenting with science and facilitate learning about pressure.

[Brief description of drawings]

FIG. 1 is a perspective view of an experimental base material of the present invention.

FIG. 2 is a perspective view of another experimental base material.

FIG. 3 is a perspective view of a base plate.

FIG. 4 is a perspective view of another base plate.

FIG. 5 is a perspective view of a mounting plate.

FIG. 6 is a perspective view of the experimental device with a part cut away.

FIG. 7 is a perspective view of another experimental device.

[Explanation of symbols]

 A Experimental base material B Base plate C Frame body D Mounting plate E Weight a Spring b Piston c Cylinder d Weight mounting portion 4 Recessed concave 6 Convex column

Claims (4)

(57) [Scope of utility model registration request] 1. A pressure for which a weight mounting portion having a unit area of 1 cm 2 is provided at an end of one sliding member of a basic body composed of a sliding member of a piston and a cylinder with a spring interposed therebetween. Experimental base material for learning. 2. An experimental base material in which a weight mounting portion having a unit area of 1 square cm is provided at an end portion of one sliding member of a basic body composed of a sliding member of a piston and a cylinder with a spring interposed therebetween. A plurality of them are arranged side by side, and a pressure is formed by holding means for holding the sliding members on the side of the experimental base material on which there is no weight mounting part so that the weight mounting parts are close to each other and form the same plane. Experimental device for learning about. 3. The holding means is constituted by a base plate having a concave shape or a convex pillar provided in a grid pattern that matches the cross-sectional shape of the sliding member on the side without the weight mounting portion. An experimental device for learning about pressure according to item 2. 4. The experimental apparatus for learning about pressure according to claim 2, wherein the holding means is constituted by a frame body that bundles the sliding member on the side without the weight mounting portion from the outside.