CN201429920Y - Gravity and buoyancy relationship demonstration instrument - Google Patents

Abstract

The utility model belongs to a teaching apparatus, and particularly relates to a gravity and buoyancy relationship demonstration instrument, which includes a transparent container containing water, afloating object, an air pump and an air duct. The floating object includes a main body and a slim rod, the main body has an inverted funnel shape, the slim rod passes through a slim part of the main body, a floating ball is arranged at the top end of the slim rod, a plug is arranged at the bottom end of the slim rod, the plug is driven by the floating ball which floats upwards, the main body is driven by the plug to move upwards, one end of the air duct is connected with the air pump, and the other end of the air duct extends to the bottom part of the transparent container. The utility model has the advantages of simple structure, convenient and easy operation, and remarkable effect, thereby enriching the teaching content.

Description

Gravity and buoyancy relation demonstration instrument

Technical field

The utility model belongs to a kind of instruments used for education, particularly a kind of gravity and buoyancy relation demonstration instrument.

Background technology

Be immersed in the object in the liquid, be subjected to the effect of buoyancy and gravity simultaneously.When buoyancy greater than gravity, object floats in liquid, swim at last on the liquid side, this moment gravity all equal buoyancy; When buoyancy equaled gravity, object was suspended in the liquid; When buoyancy during less than gravity, object sinks in liquid.Secondary school teachers generally adopts the preach method directly to impart knowledge to one's students when lecturing gravity and concern with buoyancy, and the student is less than notion intuitively, and teaching efficiency is not good enough.

The utility model content

The purpose of this utility model is to provide a kind of gravity and buoyancy relation demonstration instrument.

To achieve these goals, the technical solution of the utility model is as follows: a kind of gravity and buoyancy relation demonstration instrument, comprise transparent vessel, sink-float thing, air pump and wireway that water is housed, described sink-float thing comprises main body and thin bar, main body is inverted infundibulate, thin bar passes the elongated portion of main body, thin masthead end is provided with ball float, thin bar bottom is provided with stopper, drive stopper, stopper drive main body and up move during the ball float come-up, one end of described wireway links to each other with air pump, and the other end extends to the bottom of transparent vessel.

The utility model is simple in structure, operates easyly, and effect is obvious, has enriched the content of courses.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

The cut-open view that Fig. 2 amplifies for the utility model sink-float thing.

Embodiment

As shown in Figure 1, gravity described in the utility model and buoyancy relation demonstration instrument comprise container 1, sink-float thing, air pump 3 and wireway 4.Container 1 is made by transparent organic glass, adds water to five/everywhere of container 1 height in container 1.The main body 21 of sink-float thing is inverted infundibulate, and a thin bar 22 passes the elongated portion of main body 21, and thin bar 22 tops are provided with ball float 23, and thin bar 22 bottoms are provided with stopper 24.Outside the container 1 air pump 3 is set, an end of wireway 4 links to each other with air pump 3, and the other end extends to the bottom of transparent vessel 1.

During experimental demonstration, add water to earlier five/everywhere of container 1 height in container 1, the sink-float thing is put into water, the gravity of the thing that rises and falls this moment sinks down into the bottom of container 1, and covers the end that wireway 4 is positioned at the bottom of container 1 greater than its buoyancy that is subjected to.Open the switch of air pump 3, air pump 3 beginning gas transmissions to container 1 in, the gas that comes out from wireway 4 begins to arrange the water that rises and falls in the thing.Water in sink-float thing and the sink-float thing is regarded as a system, since gas instead the water of sink-float in the thing, the gravity that is equivalent to system has alleviated, and the suffered buoyancy of this system is constant, when the gravity of system alleviates to less than its suffered buoyancy the time, the sink-float thing begins come-up, closes the switch of air pump 3 this moment.Because the gravity of system is less than buoyancy, system is always toward come-up, emerge until ball float 23, the elongated portion of main body 21 also stretches out the water surface, and intrasystem gas is gone in the air via the elongated portion of main body 21, and water has occupied the position of gas in the sink-float thing again, the gravity of system begins to increase, when its gravity increased to greater than its suffered buoyancy, the sink-float thing began again to sink, until the bottom that sinks to container 1.

Claims (1)

1, a kind of gravity and buoyancy relation demonstration instrument, it is characterized in that: described demonstrator comprises the transparent vessel (1) that water is housed, the sink-float thing, air pump (3) and wireway (4), described sink-float thing comprises main body (21) and thin bar (22), main body (21) is inverted infundibulate, thin bar (22) passes the elongated portion of main body (21), thin bar (22) top is provided with ball float (23), thin bar (22) bottom is provided with stopper (24), drive stopper (24) during ball float (23) come-up, stopper (24) drives main body (21) and up moves, one end of described wireway (4) links to each other with air pump (3), and the other end extends to the bottom of transparent vessel (1).

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