"Utilization of Buoyancy" Buoyancy PPT Courseware 2

Description

"Utilization of Buoyancy" Buoyancy PPT Courseware 2

Knowledge review:

1. Contents of Archimedes’ principle:

2. Calculation method of buoyancy:

①Weighing method F float = G object —F pull

②The calculation formula of Archimedes’ principle: F float = ρ liquid gV discharge

3. Causes of buoyancy:

The liquid creates a pressure difference between the upper and lower surfaces of the object.

1. Floating and sinking conditions of objects

1. The floating and sinking of an object depends on the buoyancy and gravity of the object.

2. The relationship between the density of objects and the density of liquids

Buoyancy force F float = ρ liquid gV displacement gravity G = ρ object g V object

Compare based on floating and sinking conditions

F float>G float: ρ liquid>ρ substance

F float = G suspension: ρ liquid = ρ matter

F float＜G sink: ρ liquid＜ρ object

in conclusion

The floating and sinking conditions of objects are (solid objects)

(1) Objects float: F floating > G object or ρ object < ρ liquid

(2) Object sinking: F floating ρ liquid

(3) Object suspension: F float = G object or ρ object = ρ liquid

(4) Objects float: F float = G object or ρ object < ρ liquid

think

The floating and sinking of an object can be determined by the relationship between the density of the object and the density of the liquid.

This is a way to judge the floating and sinking of objects.

Steel is denser than water, but ships made of steel can travel on water. Why is this?

When a ship goes from the river to the sea, will the ship float or sink? Why?

It is in a floating state both times, and the buoyant force it experiences is equal to its own weight. The buoyant force it experiences does not change twice. Since the density of sea water is greater than the density of river water, the volume of sea water it displaces is less than the volume of river water it displaces. The ship Go up a little.

Want to discuss:

How are balloons and airships launched into the air?

By filling a gas with a density less than that of air, it is lifted into the air by being subject to a buoyancy force greater than gravity.

Balloons can rise and fall by changing buoyancy or gas density.

1. What method can be used to make a helium-filled balloon that has risen into the air fall back to the ground?

2. What method can be used to make a hot air balloon fall back to the ground?

In conclusion

1. Using the method can increase the available buoyancy.

2. Utilization of buoyancy

1.Ship

A. Make a hollow ship from steel that is denser than water so that it can displace more water and float on the water.

B. Displacement: the mass of water displaced when the ship is fully loaded, in tons.

2. Submarine

A. The submersible's descent and ascent are achieved by changing its weight.

3. Balloons and airships

A. Fill it with gas that is less dense than air so that the buoyancy force it receives is greater than gravity and it lifts off.

B. They achieve lifting by changing buoyancy (volume).

example

1. When a ship is loaded with cargo, the total cargo weight is 100,000N. How much buoyant force does it receive? How much does the displaced water weigh? What is the mass of the displaced water?

Known: G total = 10000N

Ask for: F =? G row =? m row =?

Solution: Because the object is floating, so

F=Gtotal=10000N

According to Archimedes' principle, so

F=G row=100000N

From G = mg

Obtain m row = G row / g = 100000 / 10 = 10000kg

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"Utilization of Buoyancy" Buoyancy PPT Courseware 3:

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"Utilization of Buoyancy" Buoyancy PPT courseware:

"The Utilization of Buoyancy" Buoyancy PPT courseware I would like to discuss. During the Three Kingdoms period, Cao Chong was called Xiang. In addition to using boats to weigh things, using boats to lift weights is also a Chinese invention. According to historical records, Huai Bing, a monk from Zhending County, once salvaged iron oxen. He invented the buoyant lifting method. learning target (..

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Update Time: 2024-11-13

This template belongs to Physics courseware Lu Jiao Edition Eighth Grade Physics Volume 2 industry PPT template

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