CN210515830U - High school physics lever experiment demonstration device - Google Patents
High school physics lever experiment demonstration device Download PDFInfo
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- CN210515830U CN210515830U CN201921494714.7U CN201921494714U CN210515830U CN 210515830 U CN210515830 U CN 210515830U CN 201921494714 U CN201921494714 U CN 201921494714U CN 210515830 U CN210515830 U CN 210515830U
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- lever
- back plate
- pulley
- high school
- school physics
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Abstract
The utility model discloses a high school physics lever experiment presentation device belongs to physics experimental facilities technical field. The device comprises a base, wherein a back plate is vertically arranged on the upper surface of the base, a bracket is fixedly arranged in the middle of the front of the back plate, and a fixing plate is fixedly arranged at the right end of the back plate; a ruler is arranged on the front surface of the back plate, the ruler can move up and down on the front surface of the back plate, a strip-shaped chute is arranged at the upper end of the back plate, a first pulley is arranged in the strip-shaped chute, the first pulley can slide left and right in the strip-shaped chute, and a second pulley and a third pulley are fixedly arranged on the right side of the front surface of the back plate; the damping rotating shaft is fixedly mounted at the upper end of the support, the lever arm is fixedly mounted on the inner side of the damping rotating shaft, weights are hung below the lever arm, and a graduated scale is fixedly mounted on the outer side of the damping rotating shaft. The utility model discloses simple structure, convenient to use is favorable to the clear master lever knowledge of student.
Description
Technical Field
The utility model relates to a physics experimental facilities technical field specifically is a high school physics lever experiment presentation device.
Background
The lever is divided into a labor-saving lever, a labor-saving lever and an equal-arm lever, and the lever principle is also called as a lever balance condition. To balance the lever, the two moments acting on the lever must be equal in magnitude, namely: power x power arm is represented by an algebraic expression F1*L1＝F2*L2. In the formula, F1Represents power, L1Representing a power arm, F2Represents the resistance, L2Indicating a resistive arm. From the above formula, it can be seen that to balance the lever, the power arm is several times as much as the resistance arm, and the resistance is several times as much as the power.
The lever principle is an important content in physics learning of high school, and a lever experiment is often needed to deepen understanding of students when the lever principle is taught. The existing lever experiment demonstration device is simple in structure, and different forces are applied to different positions of two ends of a lever to enable the two ends of the lever to reach a balanced state, so that a lever experiment is demonstrated. However, since the demonstration device is in a horizontal state in a balanced state, students can easily use the length of the lever from the fulcrum to the force application point as a force arm, and the students can be easily misled. The lever reaches the balanced state in-process often also needs certain time to reach balanced state, will lead to the lever unbalance a little carelessly, causes the weight to drop, and it is very inconvenient to use.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a high school physics lever principle experimental apparatus for solve above-mentioned problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a high school physics lever experiment demonstration device comprises a base, wherein a back plate is vertically arranged on the upper surface of the base, a support is fixedly arranged in the middle of the front of the back plate, and a fixing plate is fixedly arranged at the right end of the back plate; a ruler is arranged on the front surface of the back plate, the ruler can move up and down on the front surface of the back plate, a strip-shaped chute is arranged at the upper end of the back plate, a first pulley is arranged in the strip-shaped chute, the first pulley can slide left and right in the strip-shaped chute, and a second pulley and a third pulley are fixedly arranged on the right side of the front surface of the back plate; a damping rotating shaft is fixedly mounted at the upper end of the support, a lever arm is fixedly mounted on the inner side of the damping rotating shaft, weights are hung below the lever arm, and a graduated scale is fixedly mounted on the outer side of the damping rotating shaft; fixed plate surface fixed mounting has take-up, take-up includes spooler and handle, handle fixed mounting is in the spooler surface, the winding has the pull wire on the spooler, the free end of pull wire passes through pulley three pulley two and pulley one back with the lever arm is connected, be provided with the tensiometer between the pull wire.
Preferably, the left side and the right side of the back plate are provided with vertical sliding grooves, the left side and the right side of the back surface of the ruler are fixedly provided with sliding blocks, and the sliding blocks are in sliding fit with the vertical sliding grooves, so that the ruler can freely move up and down on the surface of the back plate through the sliding blocks to measure torque.
Preferably, the bar spout edge is provided with the recess, pulley one through the fixed axle with bar spout sliding fit, be provided with the jump ring on the fixed axle, but the jump ring joint is in the recess to make pulley one fix in appointed position, prevent to remove at will when the experiment.
Preferably, the lever bent arm is fixedly mounted on the inner side of the damping rotating shaft, so that students can know the moment more clearly through the lever bent arm, and wrong understanding that the moment is the length of the lever is effectively removed.
Preferably, the edge of the lever arm and the edge of the lever bent arm are provided with hanging rings, so that weights can be conveniently hung, and the connection of a traction rope is convenient.
Preferably, a height marking line is drawn on the surface of the back plate and used for measuring the rising height of the weight and the rising height of the force application end of the lever, so that the relation between the lever and work is verified.
Preferably, the spooler includes left baffle, right baffle and spool, a left side baffle with spool fixed connection, right side baffle with spool clearance fit, the spool middle part is provided with the screw hole, threaded hole internal rotation has connect fastening bolt, through revolving soon fastening bolt can with right side baffle with the spool compresses tightly, and the convenience is fastening the spool when the experiment, prevents that the pull wire is not hard up.
Preferably, the support is transparent ya keli material, is convenient for watch the ruler scale at support rear portion.
The beneficial effects of the utility model reside in that:
the utility model discloses a hoist and mount weight below the lever arm, then pull the lever arm top with the pull wire, tighten up the pull wire through the spooler and make the lever balanced, read out the numerical value of tensiometer and the numerical value of weight, the length of measuring the pull arm and resistance arm is measured to ruler and scale of reusing, can accomplish the demonstration of lever experiment, and it is very convenient to use, and numerical measurement is accurate, can make the lever arm keep balanced state for a long time to be favorable to the student to watch.
The utility model has the advantages that by arranging the first pulley, the second pulley and the third pulley, the direction of the traction line can be changed by matching the pulleys, the traction angle of the traction line can be controlled, the direction of the pulling force can be changed conveniently, and the experimental demonstration is more comprehensive; through setting up the lever bent arm, can avoid the student to think the length mistake of lever arm as the arm of force to more be favorable to the clear understanding arm of force of student, strengthen the student to the understanding of lever principle, strengthened the effect of study.
Drawings
Fig. 1 is a schematic diagram illustrating a lever arm usage according to an embodiment of the present invention.
Fig. 2 is a schematic view illustrating the use of a lever arm according to an embodiment of the present invention.
Fig. 3 is a sectional view of the bobbin of the present invention.
Fig. 4 is a schematic structural diagram of a second embodiment of the present invention.
In the figure: the device comprises a base 1, a back plate 2, a strip-shaped chute 21, a vertical chute 22, a straight ruler 23, a groove 24, a first pulley 25, a second pulley 26, a third pulley 27, a fixing plate 3, a winder 31, a left baffle 311, a bobbin 312, a right baffle 313, a fastening bolt 314, a threaded hole 315, a handle 32, a bracket 4, a damping rotating shaft 41, a lever arm 42, a lever bent arm 43, a scale 44, a hanging ring 45, a traction line 5, a tension meter 6, a weight 7 and a height marking line 8.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
In the description of the present invention, it should be understood that the terms "upper surface", "lower surface", "right end", "middle part", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The first embodiment is as follows:
referring to fig. 1-3, a high school physics lever experiment demonstration device comprises a base 1, a backboard 2 is vertically installed on the upper surface of the base 1, a support 4 is fixedly installed in the middle of the front of the backboard 2, the support 4 is made of transparent acrylic material, and a fixing plate 3 is fixedly installed at the right end of the backboard 2.
Two vertical sliding grooves 22 are formed in the left side and the right side of the back plate 2, a straight ruler 23 is arranged on the front surface of the back plate 2, sliding blocks are fixedly mounted on two sides of the back surface of the straight ruler 23, each sliding block is mounted in the corresponding vertical sliding groove 22 in a matched mode and can move up and down along the vertical sliding groove 22, and therefore the straight ruler 23 is driven to move up and down on the front surface of the back plate 2; the upper end of the back plate 2 is provided with a strip-shaped sliding groove 21, the lower end edge of the strip-shaped sliding groove 21 is provided with a plurality of grooves 24, the first pulley 23 slides left and right in the strip-shaped sliding groove 21 through a fixed shaft, a clamp spring is mounted on the fixed shaft, and the clamp spring can be clamped in the grooves 24 when the fixed shaft slides in the strip-shaped sliding groove 21, so that the first pulley is fixed at a specified position, and the first pulley is effectively prevented from moving due to stress during an experiment; a second pulley 26 and a third pulley 27 are fixedly mounted on the right side of the front surface of the back plate 2.
The surface of the fixing plate 3 is fixedly provided with a wire take-up device, the wire take-up device comprises a wire winder 31 and a handle 32, wherein the wire winder 31 comprises a left baffle 311, a right baffle 313 and a spool 312, the left baffle 311 is fixedly connected with the spool 312, the right baffle 313 is in clearance fit with the spool 312, the middle of the spool 312 is provided with a threaded hole 315, a fastening bolt 314 is screwed in the threaded hole 315, and the right baffle 313 and the spool 312 can be tightly pressed by screwing the fastening bolt 314. The handle 32 is fixedly installed on the surface of the left baffle 311 of the winder 31, the pulling wire 5 is wound on the spool 312, and the spool 312 can be easily driven to rotate by rotating the handle 32 to tighten the pulling wire 5.
The upper end of the support 4 is fixedly provided with a damping rotating shaft 41, the inner side of the damping rotating shaft 41 is fixedly provided with a lever arm 42 and a lever bent arm 43, the edges of the lever arm 42 and the lever bent arm 43 are provided with a plurality of hanging rings 45, weights 7 can be hung below the lever arm 42 and the lever bent arm 43 through the hanging rings 45 at the lower part, and the lever arm 42 and the lever bent arm 43 can be lifted up by a traction line 5 through the hanging rings 45 at the upper part; a graduated scale 44 is fixedly installed outside the damping rotating shaft 41, and the graduated scale 44 can rotate 360 degrees around the damping rotating shaft 41 to measure the moment of the traction force of the traction wire 5. The free end of the traction wire 5 is connected with a hanging ring 45 of a lever arm 42 or a lever bent arm 43 through a pulley III 27, a pulley II 26 and a pulley I25, and a tension meter 6 is arranged between the traction wires 5 and used for measuring the tension value on the traction wire 5.
The using method comprises the following steps:
when the tension meter is used, the weight 7 is hung on the hanging ring 45 below the lever arm 42, then the hanging ring 45 above the lever arm 42 is fixed by the pull wire 5, then the hand-held handle 32 rotates, so that the winder 31 recovers the pull wire 5 to lift the lever arm 42 upwards, and when the pull wire is lifted to the fixed position, the tension value F of the tension meter 6 at the moment can be read1And then the scale 44 is rotated to be perpendicular to the pull wire 5 to measure the pulling force F1Tension arm L1(ii) a Then the resistance arm L of the weight 7 is measured by using the ruler 232The resistance value F can be known according to the gravity of the weight 72. At this time, according to the formula F1*L1＝F2*L2Verification can be performed.
Similarly, the weight 7 can be hung on the hanging ring 45 below the lever bent arm 43, the pull wire 5 is fixed on the hanging ring 45 above the lever bent arm 43, and then the resistance arm L from the weight 7 to the fulcrum is measured2And a tension arm L from the traction wire 5 to the fulcrum1And the verification is carried out according to the gravity of the weight 7 and the tension of the tension meter 6.
Example two:
referring to fig. 4, a demonstration device for a high school physics lever experiment is different from the first embodiment in that a plurality of groups of heights are drawn on the front surface of the back plate 2The marking 8 can be used to measure the lifting height of the weight 7 and the lifting height of the tension point of the lever arm 42 or the lever bent arm 43. In use, the pull wire 5 is kept in a vertical direction, the lever arm 42 or the lever bent arm 43 is lifted upwards, the weight 7 is lifted to a fixed height, and the lifted height value H is read2Then, the height value H of the rise of the tension point of the lever arm 42 or the lever bent arm 43 is read1. According to the gravity value G of the weight 71And the tension value F of the tension meter 61Can measure the work W done by the pulling force1＝F1*H1And work W against the weight 72＝G1*H2According to W1And W2The numerical value of (1) indicates that the lever does not save power.
Further, the above-mentioned fixed connection and fixed mounting are to be understood in a broad sense unless otherwise specifically stated or limited, and may be, for example, welding, gluing, or integrally formed, as is conventional in the art.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (8)
1. The utility model provides a high school physics lever experiment presentation device which characterized in that: the device comprises a base (1), wherein a back plate (2) is vertically arranged on the upper surface of the base (1), a support (4) is fixedly arranged in the middle of the front of the back plate (2), and a fixed plate (3) is fixedly arranged at the right end of the back plate (2); a ruler (23) is arranged on the front surface of the back plate (2), the ruler (23) can move up and down on the front surface of the back plate (2), a bar-shaped sliding groove (21) is arranged at the upper end of the back plate (2), a first pulley (25) is arranged inside the bar-shaped sliding groove (21), the first pulley (25) can slide left and right in the bar-shaped sliding groove (21), and a second pulley (26) and a third pulley (27) are fixedly arranged on the right side of the front surface of the back plate (2); a damping rotating shaft (41) is fixedly installed at the upper end of the support (4), a lever arm (42) is fixedly installed on the inner side of the damping rotating shaft (41), a weight (7) is hung below the lever arm (42), and a graduated scale (44) is fixedly installed on the outer side of the damping rotating shaft (41); fixed plate (3) fixed surface installs take-up, take-up includes spooler (31) and handle (32), handle (32) fixed mounting be in spooler (31) surface, the winding has pull wire (5) on spooler (31), the free end of pull wire (5) passes through pulley three (27), pulley two (26) and behind pulley one (25) with lever arm (42) are connected, be provided with tensiometer (6) between pull wire (5).
2. The high school physics lever experiment demonstration device of claim 1 wherein: the backplate (2) left and right sides is provided with vertical spout (22), ruler (23) back left and right sides fixed mounting has the slider, the slider with vertical spout (22) sliding fit.
3. The high school physics lever experiment demonstration device of claim 1 wherein: the strip-shaped sliding groove (21) edge is provided with a groove (24), the first pulley (25) is in sliding fit with the strip-shaped sliding groove (21) through a fixed shaft, a clamp spring is arranged on the fixed shaft, and the clamp spring can be clamped in the groove (24).
4. The high school physics lever experiment demonstration device of claim 1 wherein: and a lever bent arm (43) is fixedly arranged on the inner side of the damping rotating shaft (41).
5. The high school physics lever experiment demonstration device of claim 4 wherein: and hanging rings (45) are arranged at the edges of the lever arm (42) and the lever bent arm (43).
6. The high school physics lever experiment demonstration device of claim 1 wherein: and a height marking line (8) is drawn on the surface of the back plate (2).
7. The high school physics lever experiment demonstration device of claim 1 wherein: the winder (31) comprises a left baffle (311), a right baffle (313) and a bobbin (312), the left baffle (311) is fixedly connected with the bobbin (312), the right baffle (313) is in clearance fit with the bobbin (312), a threaded hole (315) is formed in the middle of the bobbin (312), a fastening bolt (314) is screwed in the threaded hole (315), and the right baffle (313) and the bobbin (312) can be tightly pressed by screwing the fastening bolt (314).
8. The high school physics lever experiment demonstration device of claim 1 wherein: the support (4) is made of transparent acrylic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921494714.7U CN210515830U (en) | 2019-09-10 | 2019-09-10 | High school physics lever experiment demonstration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921494714.7U CN210515830U (en) | 2019-09-10 | 2019-09-10 | High school physics lever experiment demonstration device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210515830U true CN210515830U (en) | 2020-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921494714.7U Expired - Fee Related CN210515830U (en) | 2019-09-10 | 2019-09-10 | High school physics lever experiment demonstration device |
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| Country | Link |
|---|---|
| CN (1) | CN210515830U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113450632A (en) * | 2021-07-08 | 2021-09-28 | 刘长仕 | Transmission device based on lever principle |
-
2019
- 2019-09-10 CN CN201921494714.7U patent/CN210515830U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113450632A (en) * | 2021-07-08 | 2021-09-28 | 刘长仕 | Transmission device based on lever principle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200512 Termination date: 20210910 |