CN2686010Y

CN2686010Y - Buoyancy effect demonstrating cup

Info

Publication number: CN2686010Y
Application number: CN 200420030561
Authority: CN
Inventors: 常永忠
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-02-26
Filing date: 2004-02-26
Publication date: 2005-03-16
Anticipated expiration: 2014-02-26

Abstract

The utility model relates to a buoyancy effect demonstrating cup used for the middle school physics teaching field, and is composed of a double-layer transparent outer cup, an inner cup (2) and a leather ball (3) positioned in the inner cup. The demonstrating cup has the advantages of simple structure, easy manufacture and convenient demonstration. The demonstrating cup makes students visually comprehend the buoyancy and the generating reason of the buoyancy. The utility model can get good education effect, and is suitable for popularization and application.

Description

The buoyancy demonstration cup

Technical field:

The utility model relates to a kind of demonstration teaching aid that junior physics is learned the buoyancy teaching that is used for.

Background technology:

The reason of buoyancy and generation thereof is that junior physics is learned an important content in the teaching.At present, owing to lack image, teaching aid intuitively, feel very much class hour painstakingly saying usually, the student is also very difficult to understand, to understand this knowledge fully.For example: the student often thinks that every object under water will be subjected to buoyancy, thereby thinks that bridge pier, timber in the water also are subjected to buoyancy by mistake.Because not having can be for the imagery teaching aid of demonstration, the teacher only relies on oral account explanation and is difficult to make student's notion of correcting a mistake, the reason that correct understanding buoyancy produces.

Summary of the invention:

The purpose of this utility model is to provide a kind of buoyancy demonstration cup that can demonstrate buoyancy and generation reason thereof vivid, intuitively, help improving the physics teaching effect.

Implementation of the present utility model is such:

This kind demonstration cup is made up of the transparent outer cup of bilayer, interior cup and ball, upper funnel shape rim of a cup is along the transparent interior cup that circumferentially evenly has a plurality of gaps, place in the transparent outer cup, and mutually bonding with outer cup rim of a cup, and the opening part seat of interior glass of bottom centre is placed with ball (or table tennis).During demonstration, cup bottom opening place in earlier ball being placed, inside then cup cylindrical cup body portion fills with water.Water is excessive along the gap on its infundibulate rim of a cup when following water filling again, and this moment, ball was non-rising; Continue water filling, excessive water flows in the outer cup, and water level is risen, and arrives the ball below, the certain altitude that goes up again, and ball just floats up.By above-mentioned presentation process, the teacher can make the student understand following reason at an easy rate: cup bottom opening place in ball is sat and to be placed on, can it is stifled tight, thereby during water filling, do not leak downwards; Behind interior cup full water, there is water the ball top in the cup, and water is pushed down ball downwards, so ball is non-rising; After there is water ball below, produce buoyancy, when the buoyancy of ball below during greater than the pressure of ball top, that is the ball upper and lower exists under the situation of certain pressure difference, and ball just floats.Like this, utilize the experiment of this demonstration cup, can obtain the teaching efficiency of getting twice the result with half the effort, allow the knowledge of student's correct understanding buoyancy.

The utility model is simple in structure, is easy to making, and demonstration is convenient, utilizes it can make the student understand the knowledge of buoyancy and generation reason thereof vivid, intuitively, and acquisition is got twice the result with half the effort, impressive good teaching efficiency, is suitable for and applies.

Description of drawings:

Fig. 1 is the utility model structural representation.

Fig. 2 partly cuts off preceding view for inner cup mouth.

Fig. 3 is interior rim of a cup vertical view.

Embodiment:

The utility model is provided by following examples, is illustrated below in conjunction with accompanying drawing.

As shown in Figure 1, the utility model is made up of the transparent outer cup 1 of bilayer, interior cup 2 and ball 3, its structure assembled relation is as follows: upper funnel shape rim of a cup places in the transparent outer cup 1 along the transparent interior cup 2 that circumferentially evenly has a plurality of gaps, and mutually bonding with outer cup 1 rim of a cup, the opening part seat of interior glass of 2 bottom centre is placed with ball 3.Wherein, outer cup 1 shape, structure are identical with common water tumbler, but size big (15～20cm), can adopt transparent big beverage bottle making, remove top bottleneck bottleneck portion.Interior cup 2 can adopt the mineral water bottle about diameter 10cm to make, at the bottom of removing bottle and bottle neck, handstand, unsettled in big bottle, its top rim of a cup is outwardly open, is infundibulate, and its upper edge circumferentially is radial even interval and cuts off and become a plurality of gaps, limit portion and outer cup rim of a cup are with 502 gluing jails, and scald with electric soldering iron and to iron firmly pressing of back, the bottom inwardly is infundibulate, and bottom center has the circular hole that diameter is slightly less than ball (or table tennis).

Claims

1, a kind of buoyancy demonstration cup, form by the transparent outer cup (1) of bilayer, interior cup (2), ball (3), it is characterized in that, upper funnel shape rim of a cup places in the transparent outer cup (1) along the transparent interior cup (2) that circumferentially evenly has a plurality of gaps, and mutually bonding with outer cup (1) rim of a cup, the opening part seat of interior glass of (2) bottom centre is placed with ball (3).

2, according to right 1 described buoyancy demonstration cup, it is characterized in that: interior cup (2) can adopt the mineral water bottle about diameter 10cm, at the bottom of removing bottle and bottle neck, stand upside down, unsettled in big bottle, its top rim of a cup is outwardly open, be infundibulate, its upper edge circumferentially is radial even interval to be cut off and becomes a plurality of gaps, and limit portion is glued with an outer cup rim of a cup, and scalds with electric soldering iron and to iron firmly pressing of back, the bottom inwardly is infundibulate, and bottom center has the circular hole that diameter is slightly less than ball.