CN211264726U - Digital display direct-reading centripetal force experimental instrument - Google Patents

Abstract

The utility model discloses a digital display direct-reading centripetal force tester, which comprises a rotating shaft, a camera, an electronic dynamometer, a rope, a balancing pole, a balancing block, a turntable, a fixed pulley, a graduated scale, a baffle, a small ball, a bearing, a light blocking sheet, a photoelectric door, a timer, a motor speed regulator, a motor assembly, an upper fixed plate, a lower fixed plate, a left side plate, a right side plate and the like; the utility model discloses the beneficial effect who gains is: (1) the device has the advantages of simple structure, convenient operation, reduced error and capability of directly measuring the centripetal force; (2) the cycle of circular motion is measured by the photoelectric gate and the radius of the small ball doing circular motion is read by the graduated scale on the turntable, so that the expression of the centripetal force can be verified, the radius of the small ball doing circular motion or the cycle of the circular motion is changed, the correlation between the size of the centripetal force and certain factors can be researched, and the understanding of students on the knowledge points related to the centripetal force is facilitated.

Description

Digital display direct-reading centripetal force experimental instrument

Technical Field

The utility model relates to a middle school physics teaching and laboratory glassware especially relates to a digital display direct-reading formula centripetal force experimental apparatus.

Background

The expression for verifying centripetal force is important knowledge throughout the fifth chapter of curvilinear motion from the higher physics; at present, in experimental teaching of an expression for verifying centripetal force of a middle school textbook, the existing teaching instrument uses a cone pendulum to roughly verify the expression of the centripetal force, and the error caused by the method in actual operation and calculation is large; on the other hand, the used verification method is unstable in observability, cannot ensure that the small balls are in the same plane in the rotating process, is inconvenient to adjust, and is inconvenient to directly observe the rotating speed, the period and the centripetal force of the whole device.

Disclosure of Invention

In order to solve the problems, improve the reliability and the accuracy of the intuitiveness of the experiment and simply and accurately verify the centripetal force formula, the utility model provides a digital display direct-reading centripetal force experimental instrument; the experimental instrument comprises a rotating shaft, a camera, an electronic dynamometer, a pull rope, a balance rod, a balance block, a rotary table, a fixed pulley, a graduated scale, a baffle, a small ball, a bearing, a light blocking sheet, a photoelectric door, a motor speed regulator, a timer, a motor assembly, an upper fixed plate, a lower fixed plate, a left side plate, a right side plate and the like, and the whole experimental instrument is used as a whole.

According to the utility model provides a technical scheme, the rotation of this experiment appearance pivot is driven by adjustable speed motor, and pivot pivoted cycle is reachd by the digital time-recorder, and circular motion's radius is done to the bobble directly reads out through the scale, and the centripetal force that the bobble received passes through the electronic dynamometer measurement, reachs the registration of centripetal force size through the camera. The technical problem solved by the utility model is that the scheme mainly has the following points.

1. The experimental instrument mainly comprises a rotating shaft, a camera, an electronic dynamometer, a pull rope, a balance rod, a balance block, a rotary table, a fixed pulley, a scale, a baffle plate, a small ball, a bearing, a light blocking sheet, a photoelectric door, a timer, a motor speed regulator, a motor assembly, an upper fixed plate, a lower fixed plate, a left side plate, a right side plate and the like, wherein the bearing is sleeved in the rotating shaft, the bearing is fixed on the upper fixed plate, the lower end of the rotating shaft is connected with the motor assembly, the rotating shaft is driven by a motor to rotate, and the camera, the electronic dynamometer, the balance rod, the rotary table and the light blocking sheet are.

2. The camera and the electronic dynamometer are fixed on the rotating shaft and rotate synchronously with the rotating shaft, the camera is opposite to the reading part of the electronic dynamometer, the camera has a WIFI function and is connected with the smart phone through WIFI, and the reading of the electronic dynamometer is read out from the mobile phone in the rotating process.

3. One end of the pull rope is connected with the electronic dynamometer, the other end of the pull rope is connected with the small ball through the fixed pulley, the small ball is arranged on the rotary table, the small ball is selected from a smooth metal small ball, and the rotary table is selected from a smooth metal flat plate, so that friction force is reduced conveniently.

4. The balance rod is fixed on the rotating shaft, the balance rod is provided with a movable balance block and fixed by screws, and the movable balance block enables the balance rod, the balance block and the rotating platform to be symmetrical about the central axis of the rotating shaft so that the rotating shaft can rotate in a balanced manner.

5. The rotary table is provided with two baffles, one of the two baffles is provided with a graduated scale, so that the radius of the small ball doing circular motion can be conveniently measured, and 0 graduation of the graduated scale is arranged at the center of the rotary shaft.

6. The photoelectric door is fixed on the upper fixing plate and positioned on two sides of the light blocking sheet, the photoelectric door is connected with the timer, and the timer is fixed on the lower fixing plate.

7. The motor assembly is also connected with a motor speed regulator, the motor speed regulator is a multi-gear adjustable speed regulator, and the motor speed regulator is fixed on the right side plate.

The beneficial effects of the utility model are that the utility model discloses the beneficial effect who gains is: (1) the device has the advantages of simple structure, convenient operation and small error, and can directly measure the centripetal force; (2) the cycle of circular motion is measured by the photoelectric gate, the radius of the small ball making circular motion is read by the graduated scale on the turntable, the expression of the centripetal force can be verified, the radius of the small ball making circular motion can be changed, and the cycle of the circular motion is changed by the motor speed regulator, so that the centripetal force is researched to be related to factors, and the understanding of students on knowledge points related to the centripetal force is facilitated.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

The utility model provides a digital display direct-reading centripetal force experiment appearance can demonstrate the centripetal force experiment swiftly, directly perceived, can the size of direct measurement centripetal force and quantitative calculation centripetal force to obtain the experimental result fast.

The utility model discloses the schematic structure is shown in fig. 1, including this experiment appearance mainly by pivot (1), camera (2), electron dynamometer (3), stay cord (4), balancing pole (5), balancing piece (6), fixed pulley (7), scale (8), baffle (9), bobble (10), revolving stage (11), bearing (12), light blocking piece (13), photogate (14), time-recorder (15), motor assembly (16), motor speed regulator (17), an upper fixed plate (18), right side board (19), bottom plate (20), parts such as left side board (21) are constituteed, bearing (12) are emboliaed in pivot (1), and fix bearing (12) on upper fixed plate (18), pivot (1) lower extreme and motor assembly (16) hookup, pivot (1) are driven and are rotated by motor (16), camera (2), electron dynamometer (3), The balance rod (5), the rotary table (11) and the light blocking sheet (13) are all fixed on the rotating shaft (1); the camera (2) and the electronic dynamometer (3) are fixed on the rotating shaft (1) and synchronously rotate with the rotating shaft (1), the camera (2) is right opposite to a reading part of the electronic dynamometer (3), the camera (2) has a WIFI function, is connected with the smart phone through WIFI, and reads out the reading of the electronic dynamometer (3) from the smart phone in the rotating process; one end of a pull rope (4) is connected with the electronic dynamometer (3), the other end of the pull rope (4) is connected with a small ball (10) through a fixed pulley (7), the small ball (10) is arranged on a rotary table (11), the small ball (10) is a smooth small metal ball, and the rotary table (11) is a smooth metal flat plate, so that friction force is reduced conveniently; the balance rod (5) is fixed on the rotating shaft (1), the balance rod (5) is provided with a movable balance block (6) which is fixed by screws, and the movable balance block (6) enables the balance rod (5), the balance block (6) and the rotary table (11) to be symmetrical about the central axis of the rotating shaft (1) so that the rotating shaft (1) rotates in a balanced manner; two baffles are arranged on the rotary table (11), a graduated scale (8) is arranged on one baffle, so that the radius of the small ball doing circular motion can be conveniently measured, and 0 scale of the graduated scale (8) is arranged at the center of the rotary shaft (1); the photoelectric door (14) is fixed on the upper fixing plate (18) and positioned at two sides of the light blocking sheet (13), the photoelectric door (14) is connected with the timer (15), and the timer (15) is fixed on the lower fixing plate (20); the motor assembly (16) is also connected with a motor speed regulator (17), the motor speed regulator (17) adopts a multi-gear adjustable speed regulator, and the motor speed regulator (17) is fixed on the right side plate (19).

In this embodiment, the electronic dynamometer is first turned on, the camera and the mobile phone are connected, and the weight of the pellet is measured by the balance

Adjusting the length of the pull rope and connecting the small ball, pulling the small ball to make the electronic dynamometer have a certain reading, releasing the small ball to make the reading of the electronic dynamometer return to zero, and reading out the position of the center of the small ball from the graduated scale, namely the radius of the small ball making circular motion

Adjusting and fixing the position of the balance block on the balance rod, and presetting the periodicity measured by the timer

Starting the motor speed regulator, regulating the rotating shaft to have a certain rotating speed, after the rotating speed is stabilized, pressing down the start key of the timer, and starting timing), at the moment, reading out the reading of the electronic dynamometer from the mobile phone, namely, the centripetal force of the small ball making circular motion

Reading the automatic timer measurement from the timer

Time of one cycle

Thereby obtaining the angular velocity of the small ball making circular motion

To thereby calculate the magnitude of the centripetal force

Changing the ball to make circular motionOr changing the rotational speed of the rotating shaft, repeating the above measurement process, comparing each time

And

an experimental conclusion can be rapidly drawn, and the expression of the centripetal force is verified and verified.

Claims (5)

1. The digital display direct-reading centripetal force experimental instrument is characterized by mainly comprising a rotating shaft, a camera, an electronic dynamometer, a pull rope, a balance rod, a balance block, a rotary table, a fixed pulley, a scale, a baffle plate, a small ball, a bearing, a light blocking sheet, a photoelectric door, a timer, a motor speed regulator, a motor assembly, an upper fixed plate, a lower fixed plate, a left side plate and a right side plate, wherein the bearing is sleeved in the rotating shaft, the bearing is fixed on the upper fixed plate, the lower end of the rotating shaft is connected with the motor assembly, the rotating shaft is driven by a motor to rotate, and the camera, the electronic dynamometer, the balance rod, the rotary table and the light blocking sheet are all fixed on the rotating.

2. The digital display direct-reading centripetal force experiment instrument according to claim 1, wherein the camera and the electronic dynamometer are fixed on a rotating shaft and rotate synchronously with the rotating shaft, the camera faces a reading part of the electronic dynamometer, the camera has a WIFI function and is connected with a smart phone through WIFI, and the reading of the electronic dynamometer is read from the smart phone in the rotating process.

3. The digital display direct-reading centripetal force tester according to claim 1, wherein one end of the pull rope is connected to the electronic dynamometer, the other end of the pull rope is connected to the small ball through the fixed pulley, the small ball is placed on the turntable, the small ball is a smooth metal small ball, and the turntable is a smooth metal flat plate, so that friction is reduced.

4. The apparatus according to claim 1, wherein the balance bar is fixed to the shaft, the balance bar is provided with a movable balance weight, and the movable balance weight is fixed by a screw, and the movable balance weight makes the balance bar, the balance weight and the turntable symmetrical about a central axis of the shaft, so that the shaft rotates in a balanced manner.

5. The digital display direct-reading centripetal force experiment instrument according to claim 1, wherein two baffles are arranged on the turntable, one of the two baffles is provided with a graduated scale for measuring the radius of the small ball making circular motion, and 0 graduation of the graduated scale is arranged at the center of the rotating shaft.

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