CN203055258U

CN203055258U - Sliding friction force research and demonstration instrument

Info

Publication number: CN203055258U
Application number: CN 201320092031
Authority: CN
Inventors: 师海满
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-02-28
Filing date: 2013-02-28
Publication date: 2013-07-10
Anticipated expiration: 2023-02-28

Abstract

The utility model relates to a sliding friction force research and demonstration instrument which comprises a pedestal and support, a drum-type rotating wheel, a handle, friction surfaces, a spring dynamometer, a cuboid wooden unit and a weight, wherein the friction surfaces conduct cyclic horizontal motion when driven by the drum-type rotating wheel, and friction surfaces different in rough degree are arranged on the cuboid wooden unit. The sliding friction force research and demonstration instrument is simple in operation and stable in performance, and effectively overcomes the operation difficulty in a conventional operation where a spring dynamometer draws wooden unit to carry out uniform linear motion. The relationship between the magnitude of sliding friction force, the roughness of a contacting surface and the magnitude of pressure can be normally explored and demonstrated, and the relationship between the magnitude of sliding friction force, the size of the contacting surface and the object motion speed can be can be effectively explored and demonstrated.

Description

Force of sliding friction is probed into demonstrator

Technical field

The utility model relates to a kind of teaching aid, relates in particular to a kind of force of sliding friction and probes into demonstrator.

Background technology

At present, middle school physics for the education activities of probing into the factor that influences the force of sliding friction size in, utilize traditional teaching aid plank, wooden unit, weight, towel, cotton, weight beam to wait to finish and probe into demonstration, though this mode can reach the purpose of teaching, the experimentation less stable, its technical problem underlying is, in this experiment, the operation easier of making linear uniform motion of weight beam pulling wooden unit is big, weight beam registration instability, reading difficulty in the motion.

The utility model content

Technical problem to be solved in the utility model provides a kind of simple to operation, stable performance, can effectively solve in the traditional experiment to do the difficult force of sliding friction of linear uniform motion operation with weight beam pulling wooden unit and probe into demonstrator.

For addressing the above problem, force of sliding friction described in the utility model is probed into demonstrator, and this demonstrator comprises base and support, cartridge type runner, handle, frictional plane, weight beam, rectangular parallelepiped wooden unit, weight, it is characterized in that:

Described frictional plane is the cyclical level motion under the drive of described cartridge type runner.

Described rectangular parallelepiped wooden unit is provided with the different rubbing surface of degree of roughness.

The utility model compared with prior art has the following advantages:

1, owing to frictional plane in the utility model can be moved by cyclical level under the drive of cartridge type runner, therefore, in experimental implementation, need only by handle uniform rotation cartridge type runner, just can drive frictional plane cyclical level linear uniform motion, the employing wooden unit is motionless, the mode of the horizontal linear uniform motion of frictional plane, thus effectively solve the operation difficult point of making linear uniform motion in the traditional experiment of weight beam pulling wooden unit, make the weight beam registration be easy to stablize, make things convenient for reading.

2, owing to rectangular parallelepiped wooden unit in the utility model is provided with the different rubbing surface of degree of roughness, therefore, in experimental implementation, can save the use of equipment such as towel, cotton, simplify experimental implementation, improve conventional efficient.

3, simple to operation, the stable performance of the utility model, the relation of the size that both can conventional probe into the demonstration force of sliding friction and the size of the degree of roughness of surface of contact and pressure can be probed into the relation of the size of the size of the size of demonstrating force of sliding friction and surface of contact and object of which movement speed again easily.

Description of drawings

Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.

Fig. 1 is structural representation of the present utility model

Among the figure: 1-base and support 2-cartridge type runner 3-handle 4-frictional plane 5-weight beam

6-rectangular parallelepiped wooden unit, 7-weight.

Fig. 2 is the right stravismus of the assembling synoptic diagram of cartridge type runner, handle, frictional plane.

Fig. 3 is that synoptic diagram is launched in the side of rectangular parallelepiped wooden unit.

Embodiment

As shown in Figure 1, force of sliding friction is probed into demonstrator, and this demonstrator comprises base and support 1, cartridge type runner 2, handle 3, frictional plane 4, weight beam 5, rectangular parallelepiped wooden unit 6, weight 7.Wherein, frictional plane 4 can be moved by cyclical level under the drive of cartridge type runner 2; Rectangular parallelepiped wooden unit 6 is provided with two groups of different rubbing surfaces of degree of roughness; Wooden unit is motionless in the experimental implementation, the horizontal linear uniform motion of frictional plane; Link with weight beam in the experiment is fixed on the support, and the rectangular parallelepiped wooden unit is hung on the hook of weight beam, and when being placed on the frictional plane, weight beam keeps level.

As shown in Figure 2, frictional plane tightly is enclosed within on the cartridge type runner, drives the motion of frictional plane cyclical level when the cartridge type runner rotates.

As shown in Figure 3, the rectangular parallelepiped wooden unit 1., 2. or 3., 4. two sides, degree of roughness is identical and area varies in size; 1., 3. or 2., the 4. identical and degree of roughness difference of two lateralarea sizes.

Embodiment 1Probe into the relation of the degree of roughness of the size of force of sliding friction and surface of contact

(1) respectively with rectangular parallelepiped 2., 4. two sides are frictional contact surface, the rectangular parallelepiped wooden unit is hung on the hook of weight beam; By handle uniform rotation cartridge type runner, drive frictional plane cyclical level linear uniform motion; Observe and record the registration of weight beam.

(2) analyze the relatively registration of twice weight beam, find: surface of contact is more coarse, and force of sliding friction is more big.

(3) respectively with rectangular parallelepiped 1., 3. two sides are frictional contact surface, repeat above-mentioned experiment, also above-mentioned conclusion.

Embodiment 2Probe into the relation of the size of the size of force of sliding friction and pressure

(1) the arbitrary side with rectangular parallelepiped is frictional contact surface, the rectangular parallelepiped wooden unit is hung on the hook of weight beam; Uniform rotation cartridge type runner drives frictional plane cyclical level linear uniform motion; Observe and record the registration of weight beam.

(2) keep the frictional contact surface of rectangular parallelepiped wooden unit constant, add at the rectangular parallelepiped wooden unit and put weight, uniform rotation cartridge type runner drives frictional plane cyclical level linear uniform motion; Observe and record the registration of weight beam.

(3) analyze the relatively registration of twice weight beam, find: pressure is more big, and force of sliding friction is more big.

(4) change the frictional contact surface of rectangular parallelepiped wooden unit, repeat above-mentioned experiment, also above-mentioned conclusion.。

Embodiment 3Probe into the relation of the size of the size of force of sliding friction and surface of contact

(1) respectively with rectangular parallelepiped 1., 2. or 3., 4. two sides are frictional contact surface, the rectangular parallelepiped wooden unit is hung on the hook of weight beam, by handle uniform rotation cartridge type runner, drive frictional plane cyclical level linear uniform motion; Observe and record the registration of weight beam.

(2) analyze the relatively registration of twice weight beam, find: the size of force of sliding friction and the size of surface of contact are irrelevant.

Embodiment 4Probe into the relation of the size of the size of force of sliding friction and object of which movement speed

(1) the arbitrary side with rectangular parallelepiped is frictional contact surface, the rectangular parallelepiped wooden unit is hung on the hook of weight beam; Respectively with different speed uniform rotation cartridge type runners, drive frictional plane with different speed cyclical level linear uniform motion by handle; Observe and record the registration of weight beam.

(2) registration of comparison weight beam, find: the size of the size of force of sliding friction and object of which movement speed is irrelevant.

Claims

1. force of sliding friction is probed into demonstrator, it is characterized in that: this demonstrator comprises base and support (1), cartridge type runner (2), handle (3), frictional plane (4), weight beam (5), rectangular parallelepiped wooden unit (6), weight (7); Described frictional plane (4) is the cyclical level motion under the drive of described cartridge type runner (2).

2. force of sliding friction as claimed in claim 1 is probed into demonstrator, it is characterized in that: described rectangular parallelepiped wooden unit (6) is provided with the different rubbing surface of degree of roughness.