CN103915020A

CN103915020A - Gravitational acceleration measuring instrument used for teaching

Info

Publication number: CN103915020A
Application number: CN201410153421.8A
Authority: CN
Inventors: 陈涛; 吴晟
Original assignee: Individual
Current assignee: Xu Changfu
Priority date: 2014-04-16
Filing date: 2014-04-16
Publication date: 2014-07-09
Anticipated expiration: 2034-04-16
Also published as: CN103915020B

Abstract

The invention discloses a gravitational acceleration measuring instrument used for teaching. The gravitational acceleration measuring instrument comprises a roll ball and further comprises a protective tube. A spiral channel is formed inside the protective tube, and openings in the two ends of the spiral channel are formed in the upper end face and the lower end face of the protective tube respectively. The bore diameter of the spiral channel is larger than the diameter of the roll ball. The gravitational acceleration measuring instrument used for teaching has the advantages that the spiral channel is provided, the long channel can be obtained in the measuring instrument small in size, the size is small, measuring precision is high, and the measuring instrument can stimulate thirst for knowledge of a student.

Description

Teaching gravity accelerates one degree of survey meters

Technical field

The present invention relates to a kind of instruments used for education instrument, more precisely a kind of teaching gravity accelerates one degree of survey meters.

Background technology

Can calculate its acceleration by measuring ball by chamfer distance and time, and then calculate that acceleration of gravity is that a kind of interest is strong, fairly simple, easy to operate, the easy left-hand seat of principle, experiment that needed equipment cost is lower, can improve student to scientific and technical curiosity by this experiment, evoke student's desire for knowledge.But this instruments used for education of the prior art need larger-size inclined-plane to complete experiment, and cost is higher, and interest is lower, and measuring accuracy is lower, can not inspire preferably student's desire for knowledge.

Summary of the invention

The present invention solves the existing technical matters of prior art, thereby provide a kind of with spirality channel, can in smaller size smaller, produce longer passage, small volume, measuring accuracy is higher, can stimulate preferably the teaching gravity accelerates one degree of survey meters of student's desire for knowledge.

Above-mentioned technical matters of the present invention is mainly solved by following technical proposals:

A kind of teaching gravity accelerates one degree of survey meters, comprise a ball, described teaching also comprises a protection cylinder with gravity accelerates one degree of survey meters, the inside of described protection cylinder is provided with a spirality channel, the opening at the two ends of described spirality channel is separately positioned in the both ends of the surface up and down of described protection cylinder, and the aperture of described spirality channel is greater than the diameter of described ball.

As preferred embodiment of the present invention, the lower end of described protection cylinder is provided with a funnel.

As preferred embodiment of the present invention, the lower end of described funnel is also provided with a deceleration tube, and the inside surface of described deceleration tube is provided with elastomeric layer.

As preferred embodiment of the present invention, described teaching also comprises and accepts box with gravity accelerates one degree of survey meters, described below of accepting box and be arranged on described spirality channel.

As preferred embodiment of the present invention, described protection cylinder is made up of transparent material.

As preferred embodiment of the present invention, described protection cylinder is made up of transparent glass.

As preferred embodiment of the present invention, described protection cylinder is made up of transparent plastics.

Teaching of the present invention by the advantage of gravity accelerates one degree of survey meters is: with spirality channel, can in smaller size smaller, produce longer passage, and small volume, measuring accuracy is higher, can stimulate preferably student's desire for knowledge.

Accompanying drawing explanation

In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is the perspective view of teaching of the present invention gravity accelerates one degree of survey meters;

Fig. 2 is the perspective view of the protection cylinder in Fig. 1;

Fig. 3 is the front view of the protection cylinder in Fig. 2;

Wherein:

1, protection cylinder; 11, spirality channel; 12, funnel; 13, deceleration tube;

2, ball; 3, accept box.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that, protection scope of the present invention are made to more explicit defining.

As shown in Figure 1, Figure 2, Figure 3 shows, a kind of teaching gravity accelerates one degree of survey meters, comprise a ball 2, this teaching also comprises a protection cylinder 1 with gravity accelerates one degree of survey meters, the inside of this protection cylinder 1 is provided with a spirality channel 11, the opening at the two ends of this spirality channel 11 is separately positioned in the both ends of the surface up and down of this protection cylinder 1, and the aperture of this spirality channel 11 is greater than the diameter of this ball 2.The physical dimension that this spirality channel 11 is conducive to reduce whole teaching gravity accelerates one degree of survey meters is set, thereby reduces production costs and portability, can also reduce the translational speed of this ball 2 simultaneously, extend the time of its rolling, be conducive to accurate Measuring Time.

When experiment, use stopwatch to measure ball 2 by the needed time t of this spirality channel 11.

Calculate according to the formula of mathematical of helix the distance L that this ball 2 was rolled:

L = \frac{h \times \sqrt{{(π \times D)}^{2} + d^{2}}}{d}

Wherein: π is circular constant; D is screw diameter; D is pitch; H is spiral height, also the i.e. height of this protection cylinder 1.

Can calculate the acceleration a of this ball 2 by the relevant knowledge in physics:

a = \frac{2 \times L}{t^{2}}

Known again by the relevant knowledge in physics:

\frac{a}{g} = \frac{h}{L}

Above three formula of simultaneous can solve gravity acceleration g:

g = \frac{2 \times h \times {(π \times D)}^{2} + d^{2})}{t^{2} \times d^{2}}

As shown in Figure 2 and Figure 3, the lower end of this protection cylinder 1 is provided with a funnel 12.Because ball 2 is when rolling out in this spirality channel 11, direction and surface level out of plumb, easily cause this ball 2 to be lost, arrange this funnel 12 can make this ball 2 under penetrate, be difficult for losing.

As shown in Figure 1, Figure 2, Figure 3 shows, the lower end of this funnel 12 is also provided with a deceleration tube 13, and the inside surface of this deceleration tube 13 is provided with elastomeric layer.This deceleration tube 13 is set, can reduces the translational speed of ball 2, further prevent that this ball 2 from losing.

As shown in Figure 1, this teaching also comprises and accepts box 3 with gravity accelerates one degree of survey meters, and this accepts box 3 and be arranged on the below of this spirality channel 11.This is set and accepts box 3 and be convenient to accept this ball 2, prevent its loss.

As shown in Figure 1, Figure 2, Figure 3 shows, this protection cylinder 1 is made up of transparent glass.Student can be observed be positioned at the ball 2 of this protection cylinder 1, be not only conducive to improve the interest of experiment, be also convenient to observe the position of this ball 2, be convenient to accurate Measuring Time, thereby calculate accurately acceleration of gravity, improve the measuring accuracy of experiment simultaneously.

Use transparent glass material, be conducive to reduce the friction force between this spirality channel 11 and this ball 2, improve experimental precision.

This protection cylinder 1 also can be made up of transparent plastics, with respect to transparent glass, although friction force is larger, has the advantages such as deadweight is light, cost is lower, not fragile.

The transparent glass of the preferential employing of material of protection cylinder 1 of the present invention.

Below only with an embodiment, mentality of designing of the present invention is described, in the situation that system allows, the present invention can expand to external more functional module simultaneously, thereby expands to greatest extent its function.

The above, be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, and any variation of expecting without creative work or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.

Claims

1. a teaching gravity accelerates one degree of survey meters, comprise a ball (2), it is characterized in that: described teaching gravity accelerates one degree of survey meters also comprises a protection cylinder (1), the inside of described protection cylinder (1) is provided with a spirality channel (11), the opening at the two ends of described spirality channel (11) is separately positioned in the both ends of the surface up and down of described protection cylinder (1), and the aperture of described spirality channel (11) is greater than the diameter of described ball (2).

2. teaching gravity accelerates one degree of survey meters according to claim 1, is characterized in that: the lower end of described protection cylinder (1) is provided with a funnel (12).

3. teaching gravity accelerates one degree of survey meters according to claim 2, it is characterized in that: the lower end of described funnel (12) is also provided with a deceleration tube (13), the inside surface of described deceleration tube (13) is provided with elastomeric layer.

4. according to the teaching gravity accelerates one degree of survey meters described in claim 2 or 3, it is characterized in that: described teaching gravity accelerates one degree of survey meters also comprises accepts box (3) described below of accepting box (3) and be arranged on described spirality channel (11).

5. teaching gravity accelerates one degree of survey meters according to claim 1, is characterized in that: described protection cylinder (1) is made up of transparent material.

6. teaching gravity accelerates one degree of survey meters according to claim 5, is characterized in that: described protection cylinder (1) is made up of transparent glass.

7. teaching gravity accelerates one degree of survey meters according to claim 5, is characterized in that: described protection cylinder (1) is made up of transparent plastics.