"Buoyancy of Water" PPT courseware

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"Buoyancy of Water" PPT courseware

Part One: Review Questions

What are the conditions for objects to float and sink?

(1) Object sinking: F floating ρ liquid

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

Water buoyancy PPT, part 2: application

Application 1. Density meter

① It works based on the principle of F float = G meter when an object floats on the liquid surface.

②The scale lines on the density meter are uneven. From bottom to top, the scale lines become sparse and sparse, and the scale values ​​become smaller and smaller.

③The scale value on the density meter is the ratio of the density of the liquid being measured to the density of water.

Application 2. Ship

Principle: When the density of the liquid remains constant, if you want to obtain greater buoyancy, you must ____________.

Use the "hollow" method to increase the volume so that it can displace more water and increase the buoyancy, ultimately making the F float = G boat float on the water.

Ships have different sizes. How does it reflect the ship's carrying capacity?

Application 3. Submarine

① Adoption: The buoyancy remains unchanged after being immersed in water, and the sinking and floating is achieved by changing its own gravity (filling or draining the water tank);

② Whether the submarine sinks or floats under the water, the buoyancy force it receives remains unchanged. When filling the water tank, when the average density of the submarine ρ average > ρ water, the submarine sinks. When ρ average = ρ water, the submarine floats. When draining, when ρ average < ρ water, The submarine will float up.

Water buoyancy PPT, part three: summary

The key to utilizing buoyancy is to adjust the relationship between gravity and buoyancy.

(1) If the buoyancy remains unchanged, it can change its own gravity and achieve sinking and floating (such as a submarine submerged in water)

(2) If the gravity is kept constant, the volume of the displaced liquid (or gas) can be changed to achieve sinking and floating. (Such as ships, fish bubbles and balloons).

Water buoyancy PPT, Part 4: Consolidation exercises

1. The ship uses the "_____" method to increase the available buoyancy and float on the water. Submarines float and sink by changing _____. To make a submarine floating on the water surface dive into the water, it should _____.

2. Submerge an aluminum hollow ball into the water by hand. After letting go, the ball will: ( )

A. Floating B. Sinking

C. Suspended D. Unable to determine

3. When a ship sails from the East China Sea into the Yangtze River, which of the following statements is wrong ( )

A. The buoyancy force on the ship remains unchanged

B. The gravity of the liquid displaced by the ship remains unchanged.

C. The volume of liquid displaced by the ship remains unchanged.

D. The volume of liquid displaced by the ship increases

Keywords: Zhejiang Education Edition eighth grade science PPT courseware free download, water buoyancy PPT download, .PPT format;

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Update Time: 2024-10-18

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 1 industry PPT template

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