CN109523874B - Experimental device for measuring and calculating centripetal force of middle school physics - Google Patents
Experimental device for measuring and calculating centripetal force of middle school physics Download PDFInfo
- Publication number
- CN109523874B CN109523874B CN201811265142.5A CN201811265142A CN109523874B CN 109523874 B CN109523874 B CN 109523874B CN 201811265142 A CN201811265142 A CN 201811265142A CN 109523874 B CN109523874 B CN 109523874B
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- centripetal force
- strut
- sliding
- bottom plate
- sliding groove
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
- G09B23/00—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes
- G09B23/06—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics
- G09B23/08—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics
- G09B23/10—Models for scientific, medical, or mathematical purposes, e.g. full-sized devices for demonstration purposes for physics for statics or dynamics of solid bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
Abstract
The invention discloses a middle school physics centripetal force measuring and calculating experimental device, which comprises a bottom plate, a pillar and an experimental table, wherein the bottom plate is provided with a support column; the strut is fixedly arranged at the middle position on the bottom plate, the strut is of a hollow cylindrical structure, a sliding groove is formed in the outer side of the strut, a sliding sleeve is sleeved on the outer side of the strut, and the sliding sleeve is in sliding connection with the sliding groove; the inside of pillar is rotated and is installed the rotation axis, and the cavity has been seted up to the upside inside of rotation axis, and the bottom of cavity is rotated and is installed the wire winding roller, and the winding has the stay cord on the wire winding roller, the experiment bobble has been placed on the laboratory bench, the other end fixed connection of experiment bobble and stay cord. The method can measure and calculate the influence of the common physical quantity on the centripetal force, and can also measure and calculate the influence of the angle on the centripetal force, so that students can more easily understand the actual significance of each physical quantity in the centripetal force calculation formula.
Description
Technical Field
The invention relates to an experimental device, in particular to an experimental device for measuring and calculating the centripetal force of middle school physics.
Background
In classical mechanics, centripetal force is the resultant force of an external force directed towards the center of a circle (center of curvature) as an object moves along a circular or curvilinear path. The term "centripetal force" is named from the effect of such combined external forces. This effect may be provided by any force, such as spring force, gravity, friction, etc., or by a combination of several forces or a component thereof.
Because the circular motion belongs to the curvilinear motion, the object in the circular motion can be simultaneously subjected to the action of the resultant external force different from the speed direction of the object. For an object moving in a circular motion, the centripetal force is a pulling force, and the direction of the pulling force is continuously changed along with the motion of the object on the circular track. This pulling force is directed along the radius of the circumference toward the center of the circumference, hence the name "centripetal force". The centripetal force is directed to the center of the circle, and the object controlled by the centripetal force moves along the tangential direction, so the centripetal force must be perpendicular to the moving direction of the controlled object, and only the acceleration in the direction of the speed normal is generated. Thus, centripetal force changes only the direction of motion of the controlled object, but not the rate of motion, even in non-uniform circular motion. In non-uniform circular motion, the tangential acceleration that changes the rate of motion is not generated by centripetal force.
According to a centripetal force calculation formula, the centripetal force is determined by the mass, the angular velocity and the turning radius of a tested object, the centripetal force value is calculated by changing the three physical quantities on a plane in the conventional measurement of the centripetal force in the middle school experiment, so that the influence of the physical quantities on the centripetal force is observed, but a student cannot completely understand the physical quantity of the turning radius in the learning process, so that the correct calculation of the centripetal force is influenced.
Disclosure of Invention
The invention aims to provide an experimental device for measuring and calculating the centripetal force in middle school physics, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a middle school physics centripetal force measuring and calculating experimental device comprises a bottom plate, a pillar and an experiment table; the left side and the right side of the bottom plate are symmetrically and fixedly provided with two side plates, and the upper ends of the two side plates are fixedly connected through a cross beam; the strut is fixedly arranged at the middle position on the bottom plate, the strut is of a hollow cylindrical structure, a sliding groove is formed in the outer side of the strut, a sliding sleeve is sleeved on the outer side of the strut, and the sliding sleeve is in sliding connection with the sliding groove; the experiment table consists of four fan-shaped plates, every two fan-shaped plates are fixedly connected through an elastic connecting piece, one ends of the four fan-shaped plates are rotatably connected with the upper end of the strut, push-pull rods are rotatably arranged at the bottoms of the four fan-shaped plates, and the other ends of the four push-pull rods are respectively hinged with the periphery of the sliding sleeve; the inside of pillar is rotated and is installed the rotation axis, and the cavity has been seted up to the upside inside of rotation axis, and the bottom of cavity is rotated and is installed the wire winding roller, and the winding has the stay cord on the wire winding roller, the experiment bobble has been placed on the laboratory bench, the other end fixed connection of experiment bobble and stay cord.
As a further scheme of the invention: threaded holes are symmetrically formed in the periphery of the sliding groove, a plurality of threaded holes are formed in the periphery of the sliding groove and are arranged at equal intervals from top to bottom along the sliding groove, and fastening screws corresponding to the threaded holes are symmetrically arranged on the periphery of the sliding sleeve.
As a still further scheme of the invention: a plurality of limiting plates are evenly arranged inside the cavity, a through hole is formed in the upper portion of the support column, a limiting ring is fixedly arranged on the upper side of the support column, and the through hole, the limiting plates and the limiting ring are vertically arranged.
As a still further scheme of the invention: the bottom plate is further provided with a driving device, the driving device comprises a second motor and a connecting shaft, the second motor is fixedly installed on the bottom plate, the output end of the second motor is fixedly connected with the connecting shaft through a coupler, and the other end of the connecting shaft is in transmission connection with the lower end of the rotating shaft through a bevel gear set.
As a still further scheme of the invention: and the sector plate is provided with a scale strip.
As a still further scheme of the invention: the downside of crossbeam is provided with the tachymeter, and the specific model of tachymeter is ulide UT 371.
As a still further scheme of the invention: the lower side of the cross beam is provided with a screw rod, the left end and the right end of the screw rod are respectively connected with the two side plates in a rotating mode, a threaded sleeve is connected onto the screw rod in a threaded mode, the upper side of the threaded sleeve is connected with the cross beam in a sliding mode, a speed measuring instrument is fixedly mounted on the lower side of the threaded sleeve, and a first motor for driving the screw rod to rotate is fixedly mounted on the outer side of each side plate.
Compared with the prior art, the invention has the beneficial effects that: the length of the pull rope is controlled by the winding roller during an experiment, so that the rotating radius of the experimental small ball is changed, the screw rod can be driven to rotate by the first motor, the screw sleeve is driven to move, the position of the speedometer is changed, the speedometer is close to the experimental small ball, so that the rotating speed of the experimental small ball can be accurately detected, the sliding sleeve can be fixed at different heights on the support through the matching of the fastening screws and the threaded holes, the sector plate is driven to rotate by the push-pull rod, the angle between the sector plate and the horizontal plane is changed, the influence of common physical quantities on the centripetal force can be measured and calculated, and students can more easily understand the actual significance of the physical quantities in the centripetal force calculation formula.
Drawings
Fig. 1 is a schematic structural diagram of a middle school physical centripetal force measurement and calculation experimental device.
Fig. 2 is a schematic structural diagram of a strut in the middle school physical centripetal force measurement experimental device.
Fig. 3 is a schematic structural diagram of a rotating shaft in the middle school physical centripetal force measurement and calculation experimental apparatus.
FIG. 4 is a top view of the support column of the experimental apparatus for measuring and calculating the centripetal force in middle school physics.
Fig. 5 is a schematic structural diagram of a laboratory bench in the middle school physical centripetal force measurement and calculation experimental device.
In the figure: the experimental device comprises a base plate 1, a support column 2, a rotating shaft 3, a sliding sleeve 4, a push-pull rod 5, a side plate 6, an experimental table 7, a screw rod 8, a cross beam 9, a threaded sleeve 10, a velocimeter 11, a small experimental ball 12, a pull rope 13, a first motor 14, a second motor 15, a sliding chute 16, a threaded hole 17, a fastening screw 18, a through hole 19, a wire guide ring 20, a limiting plate 21, a wire winding roller 22, a cavity 23, a sector plate 24, an elastic connecting piece 25 and a scale bar 26.
Detailed Description
The technical solution of the present invention will be described in further detail with reference to specific embodiments.
Example 1
Referring to fig. 1-5, a middle school physical centripetal force measuring and calculating experimental apparatus includes a base plate 1, a pillar 2 and an experimental bench 7; the left side and the right side of the bottom plate 1 are symmetrically and fixedly provided with two side plates 6, and the upper ends of the two side plates 6 are fixedly connected through a cross beam 9; the strut 2 is fixedly arranged at the middle position on the bottom plate 1, the strut 2 is of a hollow cylindrical structure, a sliding groove 16 is formed in the outer side of the strut 2, a sliding sleeve 4 is further sleeved on the outer side of the strut 2, and the sliding sleeve 4 is in sliding connection with the sliding groove 16; threaded holes 17 are symmetrically formed in the periphery of the sliding groove 16, a plurality of threaded holes 17 are formed in the periphery of the sliding groove 16 and are arranged at equal intervals from top to bottom along the sliding groove 16, fastening screws 18 corresponding to the threaded holes 17 are symmetrically arranged on the periphery of the sliding sleeve 4, and the sliding sleeve 4 is fixed on the support column 2 at different heights through the matching of the fastening screws 18 and the threaded holes 17; the experiment table 7 is composed of four sector plates 24, every two sector plates 24 are fixedly connected through an elastic connecting piece 25, one ends of the four sector plates 24 are rotatably connected with the upper end of the support column 2, push-pull rods 5 are rotatably mounted at the bottoms of the four sector plates 24, the other ends of the four push-pull rods 5 are respectively hinged with the periphery of the sliding sleeve 4, and the sector plates 24 are driven to rotate through the push-pull rods 5 by changing the height of the sliding sleeve 4, so that the angles of the sector plates 24 and the horizontal plane are changed;
the rotating shaft 3 is rotatably arranged inside the strut 2, a cavity 23 is formed in the upper side of the rotating shaft 3, a winding roller 22 is rotatably arranged at the bottom of the cavity 23, a pull rope 13 is wound on the winding roller 22, an experiment small ball 12 is placed on the experiment table 7, the experiment small ball 12 is fixedly connected with the other end of the pull rope 13, and the length of the pull rope 13 is controlled through the winding roller 22, so that the rotating radius of the experiment small ball is changed; a plurality of limiting plates 21 are uniformly arranged in the cavity 23, a through hole 19 is formed in the upper part of the strut 2, a limiting ring 20 is fixedly arranged on the upper side of the strut 2, and the through hole 19, the limiting plates 21 and the limiting ring 20 are vertically arranged so as to keep the pull rope 13 in a vertical state;
in order to drive the rotating shaft 3 to rotate inside the pillar 2, the base plate 1 is further provided with a driving device, the driving device comprises a second motor 15 and a connecting shaft, the second motor 15 is fixedly installed on the base plate 1, the output end of the second motor 15 is fixedly connected with the connecting shaft through a coupler, and the other end of the connecting shaft is in transmission connection with the lower end of the rotating shaft 3 through a bevel gear set, so that the rotating shaft 3 is driven to rotate by the rotation of the second motor 15;
in the experiment, in order to measure the rotation radius of the experimental small ball 12 conveniently, the sector plate 24 is provided with a scale bar 26;
the lower side of the cross beam 9 is provided with a velocimeter 11, the specific model of which is ulide UT371, so as to detect the speed of the experimental small ball 12 during rotation, and the centripetal force of the small ball is calculated according to a centripetal force formula.
Example 2
Referring to fig. 1-5, a middle school physical centripetal force measuring and calculating experimental apparatus includes a base plate 1, a pillar 2 and an experimental bench 7; the left side and the right side of the bottom plate 1 are symmetrically and fixedly provided with two side plates 6, and the upper ends of the two side plates 6 are fixedly connected through a cross beam 9; the strut 2 is fixedly arranged at the middle position on the bottom plate 1, the strut 2 is of a hollow cylindrical structure, a sliding groove 16 is formed in the outer side of the strut 2, a sliding sleeve 4 is further sleeved on the outer side of the strut 2, and the sliding sleeve 4 is in sliding connection with the sliding groove 16; threaded holes 17 are symmetrically formed in the periphery of the sliding groove 16, a plurality of threaded holes 17 are formed in the periphery of the sliding groove 16 and are arranged at equal intervals from top to bottom along the sliding groove 16, fastening screws 18 corresponding to the threaded holes 17 are symmetrically arranged on the periphery of the sliding sleeve 4, and the sliding sleeve 4 is fixed on the support column 2 at different heights through the matching of the fastening screws 18 and the threaded holes 17; the experiment table 7 is composed of four sector plates 24, every two sector plates 24 are fixedly connected through an elastic connecting piece 25, one ends of the four sector plates 24 are rotatably connected with the upper end of the support column 2, push-pull rods 5 are rotatably mounted at the bottoms of the four sector plates 24, the other ends of the four push-pull rods 5 are respectively hinged with the periphery of the sliding sleeve 4, and the sector plates 24 are driven to rotate through the push-pull rods 5 by changing the height of the sliding sleeve 4, so that the angles of the sector plates 24 and the horizontal plane are changed;
the rotating shaft 3 is rotatably arranged inside the strut 2, a cavity 23 is formed in the upper side of the rotating shaft 3, a winding roller 22 is rotatably arranged at the bottom of the cavity 23, a pull rope 13 is wound on the winding roller 22, an experiment small ball 12 is placed on the experiment table 7, the experiment small ball 12 is fixedly connected with the other end of the pull rope 13, and the length of the pull rope 13 is controlled through the winding roller 22, so that the rotating radius of the experiment small ball is changed; a plurality of limiting plates 21 are uniformly arranged in the cavity 23, a through hole 19 is formed in the upper part of the strut 2, a limiting ring 20 is fixedly arranged on the upper side of the strut 2, and the through hole 19, the limiting plates 21 and the limiting ring 20 are vertically arranged so as to keep the pull rope 13 in a vertical state;
in order to drive the rotating shaft 3 to rotate inside the pillar 2, the base plate 1 is further provided with a driving device, the driving device comprises a second motor 15 and a connecting shaft, the second motor 15 is fixedly installed on the base plate 1, the output end of the second motor 15 is fixedly connected with the connecting shaft through a coupler, and the other end of the connecting shaft is in transmission connection with the lower end of the rotating shaft 3 through a bevel gear set, so that the rotating shaft 3 is driven to rotate by the rotation of the second motor 15;
in the experiment, in order to measure the rotation radius of the experimental small ball 12 conveniently, the sector plate 24 is provided with a scale bar 26;
the difference between the embodiment and the embodiment 1 is that a screw 8 is arranged on the lower side of the cross beam 9, the left end and the right end of the screw 8 are respectively rotatably connected with the two side plates 6, a threaded sleeve 10 is connected to the screw 8 in a threaded manner, the upper side of the threaded sleeve 10 is slidably connected with the cross beam 9, and a velocimeter 11 is fixedly mounted on the lower side of the threaded sleeve 10; the outer side of the side plate 6 is also fixedly provided with a first motor 14 for driving the screw rod 8 to rotate, the first motor 14 drives the screw rod 8 to rotate, so that the screw sleeve 10 is driven to move to change the position of the velocimeter 11, the velocimeter 11 is enabled to be close to the small experimental ball, the speed of the small experimental ball 12 during rotation can be accurately detected, and the centripetal force of the small ball can be calculated according to a centripetal force formula.
The length of the pull rope is controlled by the winding roller during an experiment, so that the rotating radius of the experimental small ball is changed, the screw rod can be driven to rotate by the first motor, the screw sleeve is driven to move, the position of the speedometer is changed, the speedometer is close to the experimental small ball, so that the rotating speed of the experimental small ball can be accurately detected, the sliding sleeve can be fixed at different heights on the support through the matching of the fastening screws and the threaded holes, the sector plate is driven to rotate by the push-pull rod, the angle between the sector plate and the horizontal plane is changed, the influence of common physical quantities on the centripetal force can be measured and calculated, and students can more easily understand the actual significance of the physical quantities in the centripetal force calculation formula.
While the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (1)
1. A middle school physics centripetal force measuring and calculating experimental device comprises a bottom plate (1), a support column (2) and an experimental table (7); the supporting structure is characterized in that the supporting column (2) is fixedly arranged at the middle position of the bottom plate (1), the supporting column (2) is of a hollow cylindrical structure, a sliding groove (16) is formed in the outer side of the supporting column (2), a sliding sleeve (4) is further sleeved on the outer side of the supporting column (2), and the sliding sleeve (4) is in sliding connection with the sliding groove (16); the experiment table (7) consists of four sector plates (24), every two sector plates (24) are fixedly connected through an elastic connecting piece (25), one ends of the four sector plates (24) are rotatably connected with the upper end of the strut (2), the bottoms of the four sector plates (24) are respectively rotatably provided with a push-pull rod (5), and the other ends of the four push-pull rods (5) are respectively hinged with the periphery of the sliding sleeve (4); the novel steel wire rope pulling experiment table is characterized in that a rotating shaft (3) is installed inside the strut (2) in a rotating mode, a cavity (23) is formed in the upper side of the rotating shaft (3), a winding roller (22) is installed at the bottom of the cavity (23) in a rotating mode, a pull rope (13) is wound on the winding roller (22), an experiment small ball (12) is placed on the experiment table (7), the experiment small ball (12) is fixedly connected with the other end of the pull rope (13), threaded holes (17) are symmetrically formed in the periphery of the sliding groove (16), a plurality of threaded holes (17) are formed in the threaded holes (17), the threaded holes (17) are arranged at equal intervals from top to bottom along the sliding groove (16), fastening screws (18) corresponding to the threaded holes (17) are symmetrically arranged on the periphery of the sliding sleeve (4), a plurality of limiting plates (21) are evenly installed inside the cavity (23), through holes (, through-hole (19), limiting plate (21) and spacing ring (20) are vertically arranged, still be provided with drive arrangement on bottom plate (1), drive arrangement includes second motor (15) and connecting axle, and second motor (15) fixed mounting is on bottom plate (1), and the output of second motor (15) passes through shaft coupling and connecting axle fixed connection, and the other end of connecting axle passes through bevel gear group and is connected with the lower extreme transmission of rotation axis (3), be provided with scale bar (26) on sector plate (24), the downside of crossbeam (9) is provided with tachymeter (11), and the specific model of tachymeter is ulide UT, the downside of crossbeam (9) is provided with screw rod (8), and the left and right sides both ends of screw rod (8) rotate with two blocks of curb plate (6) respectively and are connected, threaded connection has swivel nut (10) on screw rod (8), the upside and crossbeam (9) sliding connection of swivel nut (10), a velocimeter (11) is fixedly installed on the lower side of the screw sleeve (10), and a first motor (14) for driving the screw rod (8) to rotate is further fixedly installed on the outer side of the side plate (6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811265142.5A CN109523874B (en) | 2018-10-29 | 2018-10-29 | Experimental device for measuring and calculating centripetal force of middle school physics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811265142.5A CN109523874B (en) | 2018-10-29 | 2018-10-29 | Experimental device for measuring and calculating centripetal force of middle school physics |
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| CN109523874A CN109523874A (en) | 2019-03-26 |
| CN109523874B true CN109523874B (en) | 2020-12-18 |
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| CN201811265142.5A Expired - Fee Related CN109523874B (en) | 2018-10-29 | 2018-10-29 | Experimental device for measuring and calculating centripetal force of middle school physics |
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| CN111710223B (en) * | 2020-06-03 | 2023-05-12 | 中国安全生产科学研究院 | Variable terrain frame device for simulating slope bedrock |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6443736B1 (en) * | 1998-02-27 | 2002-09-03 | Robert W Lally | Technology explorer model |
| US9972354B2 (en) * | 2012-08-27 | 2018-05-15 | Michael Boyd | Calibrated device and method to detect material features on a spinning surface by generation and detection of gravito-magnetic energy |
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|---|---|---|---|---|
| SU771705A1 (en) * | 1972-06-12 | 1980-10-15 | За витель | Education appliance for demonstration of rotational motion laws |
| CN201417527Y (en) * | 2009-03-23 | 2010-03-03 | 王远 | Multifunctional teaching demonstration instrument |
| CN203276664U (en) * | 2013-04-28 | 2013-11-06 | 大连民族学院 | Demonstrator for centripetal force |
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