CN205943226U - Parallelogram rule demonstration instrument - Google Patents

Abstract

The utility model discloses a parallelogram law demonstration instrument, which comprises a bottom plate and a vertical plate fixed on one side of the bottom plate. Drawings are fixed on the top of the vertical plate through square clips, and the suspension end of the S-shaped tension sensor is fixed in the middle of the hanging plate. The measuring end of the S-type tension sensor is connected with two ropes. The ends of the two ropes are respectively provided with hooks. The pulley moves left and right along the slideway. One end of the pin shaft passes through the vertical plate and is locked by a nut. Two ropes are respectively wound on the pulley and weights are respectively arranged on the hooks at the ends of the ropes. The utility model has the characteristics of convenient use, novel structure and high precision.

Description

Parallelogram Law Demonstration Instrument

technical field

The utility model belongs to the technical field of practical teaching aids for physics teaching, in particular to a demonstration instrument for the law of parallelograms used in middle school physics teaching.

Background technique

In the part about the decomposition and synthesis of force in the basic knowledge of high school physics, ordinary textbooks generally use the decomposition method of XY axis to explain the calculation of component force and resultant force. Decomposition force is to better solve the calculation of some forces that cannot be directly solved. This original intention brings certain difficulties to the decomposition of students' comprehension. They cannot be directly imagined or observed directly. Continuity is not conducive to in-depth study of basic physical knowledge, and the advancement of modern technology has brought the possibility of directly demonstrating the decomposition and synthesis of forces.

Contents of the invention

The technical problem solved by the utility model is to provide an instrument for demonstrating the parallelogram law that is used in physics teaching in middle schools, which is convenient to use, novel in structure and high in accuracy.

The utility model adopts the following technical scheme to solve the above-mentioned technical problems. The parallelogram law demonstration instrument is characterized in that it includes a base plate and a vertical plate fixed on one side of the base plate. The upper part of the base plate is provided with a placement groove for placing a digital angle ruler. One side of the vertical board is provided with a level ruler, the bottom of the bottom board is provided with adjustment legs, the top of the vertical board is fixed with drawing paper through square clips, the hanging end of the S-type tension sensor is fixed in the middle of the hanging board, and the S-type tension sensor is connected to the The display screen is electrically connected. The measuring end of the S-type tension sensor is connected with two ropes. The ends of the two ropes are respectively equipped with hooks. The shaft is fixed with two pulleys that can move left and right along the slideway. One end of the pin shaft passes through the vertical plate and is locked by a nut. Two ropes are respectively wound on the pulleys and weights are respectively provided on the hooks at the ends of the ropes.

The utility model has the characteristics of convenient use, novel structure and high precision. The novelty of this utility model is that 1. the angle of the force is adjusted by moving the pulley on the track, and the size of each component force can be adjusted as required, which is more universal than the previous device with two pulleys and a thin wire. ② Adjust the horizontal line of the base and the parallel direction of the pulley without angular deviation to reduce the experimental error. ③Using the tension sensor and digital display angle ruler, it is convenient and intuitive to read the display of resultant force, and it improves the students' interest in the experiment. ④The square clip can be used to clip paper to draw pictures, use the scale to draw the size of the force, and then draw the direction of the force according to the thin line, which can clearly reflect the decomposition and synthesis of the force. In addition, a level ruler is also used, which ensures that the experiment is carried out on the same plane, thereby reducing the experimental error. By using a variety of new tools to measure the experimental results, the error caused by the experimental friction and readings is greatly reduced, which is better for the teacher. Good teaching performance.

Description of drawings

Fig. 1 is the structural representation of the utility model.

In the figure: 1. Bottom plate, 2. Vertical plate, 3. Digital display angle ruler, 4. Placement slot, 5. Level ruler, 6. Adjusting leg, 7. Square clip, 8. Hanging plate, 9. S-shaped tension Sensor, 10, display screen, 11, rope, 12, pulley.

detailed description

The specific content of the utility model is described in detail in conjunction with the accompanying drawings. Parallelogram law demonstration instrument, including a base plate 1 and a vertical plate 2 fixed on one side of the base plate 1, the upper part of the base plate 1 is provided with a placement groove 4 for placing a digital display angle ruler 3, and the left and right sides of the base plate 1 are provided with a level ruler 5 , the bottom of the base plate 1 is provided with an adjustment leg 6, the top of the vertical plate 2 is fixed with a hanging plate 8 through a square clip 7, the hanging end of the S-type tension sensor 9 is fixed in the middle of the hanging plate 8, and the S-type tension sensor 9 passes through the line It is electrically connected with the display screen 10, and the measuring end of the S-shaped tension sensor 9 is connected with two ropes 11, and the ends of the two ropes 11 are respectively provided with hooks, and the middle part of the vertical board 2 is provided with a hook that is consistent with the extension direction of the hanging board 8. The slideway is fixed with two pulleys 12 that can move left and right along the slideway by pin shafts. One end of the pin shaft passes through the vertical plate 2 and is locked by a nut. Two ropes 11 are respectively wound on the pulleys 12 and placed on The hooks at the ends of the ropes 11 are respectively provided with weights, and the plane formed by the ropes is parallel to the vertical plate.

The specific application process of the utility model is as follows: first, adjust the level of the base plate according to the level ruler arranged on one side of the base plate, and adjust the level of the base plate by setting the adjusting legs at the bottom of the base plate, and then fix the pulleys at different positions of the slideway, and then adjust the level of the base plate at the end of the rope. Weights of known weight are hung on the hook respectively, and the angle between the two ropes connected to the S-type tension sensor is measured with a digital display angle ruler, and the tension indication of the S-type tension sensor is read through the display screen, and the scale is used to draw the force. size, so that the parallelogram law of force can be easily demonstrated. It can conveniently and intuitively read out the indication of resultant force, and improves students' interest in experiments. In addition, a level ruler is also used to ensure that the experiment is carried out on the same plane, thereby reducing the experimental error. The pulley can slide on the track to change the angle between the component forces and improve the universality of the experiment. In addition, by using a variety of new tools to measure the experimental results, compared with the previous spring dynamometer measurement, the error caused by the reading is greatly reduced, and the teacher has a better teaching interpretation effect.

The basic principles, main features and advantages of the present utility model have been shown and described above. On the premise of not departing from the spirit and scope of the present utility model, the present utility model also has various changes and improvements, and these changes and improvements all fall into the claims. The scope of the utility model.

Claims (1)

1. parallelogram law demonstration instrument is it is characterised in that the riser that includes base plate and be fixed on base plate side, base plate Top is provided with the standing groove for placing Digit Display Angle Ruler, and the left and right sides of base plate is provided with horizon rule, and the bottom of base plate is provided with tune Section supporting leg, the top of riser is passed through side's folder and is fixed with drawing, and the suspended end of S type pulling force sensor is fixed on the middle part of link plate, S type Pulling force sensor is passed through circuit and is electrically connected with display screen, and the measurement end of S type pulling force sensor is connected with two ropes, two ropes The end of rope is respectively equipped with hook, and the middle part of riser is provided with stretches out the consistent slideway in direction with link plate, slideway passes through bearing pin solid Surely there are two pulleys that can move left and right along slideway, one end of bearing pin passes through riser and passes through nut check, and two ropes divide It is not set around on pulley and counterweight is respectively equipped with the hook of rope end.