"Exploration - Factors Affecting Buoyancy" Pressure and Buoyancy PPT Courseware 2

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"Exploration - Factors Affecting Buoyancy" Pressure and Buoyancy PPT Courseware 2

Independent exploration, communication and cooperation, presentation and reporting

Does water have any effect on the objects placed in it?

Whether an object is floating on the water or submerged in the water, it will experience an upward force exerted by the water on it. This force is called buoyancy.

Objects placed in other liquids will also be affected by buoyancy.

The direction of buoyancy is always vertical upward.

Experimental exploration

Why does an object experience an upward buoyant force?

hint

The internal pressure of a liquid increases with depth.

The pressure of the liquid on the lower surface of the object is greater than the pressure of the liquid on the upper surface, and the resultant force of the pressure exerted by the liquid on the object is upward.

intensive training

1. Objects A and B are both immersed in the same liquid. Which of the following statements about the buoyancy force they experience is correct ( )

A. Object A is heavier than object B, so the buoyant force on object A is greater than the buoyant force on object B.

B. If the density of object A is greater than that of object B, the buoyant force on object A is smaller than the buoyant force on object B.

C. If the volume of object A is smaller than that of object B, the buoyant force on object A is smaller than the buoyant force on object B.

D. If object A is hollow and object B is solid, the buoyant force on object A is greater than the buoyant force on object B.

2. When a submarine dives from a certain depth in the sea to an inland river, which of the following statements is correct ( )

A. Submarines experience great buoyancy in the sea

B. Submarines experience less buoyancy in the sea

C. Submarines experience the same buoyant force in the ocean as in inland rivers

D. Insufficient conditions to determine

3. An object is hung under the dynamometer, and the reading is 9N. When it is completely immersed in alcohol, the buoyancy force it receives is 5N, and the reading of the dynamometer is ________N; if half of the object is immersed in alcohol, At this time, the reading of the dynamometer is _______N.

4. The metal block hanging below the dynamometer weighs 50N. When it is immersed in water, the pressure on the lower surface is 15N and the pressure on the upper surface is 5N. Then the buoyancy force on the metal block is _____N. Measure The indication of the force meter is _________.

5. A wooden block with a volume of 15CM3 is put into a container filled with water. When the wooden block floats, 9ML of water flows out. What is the buoyant force on the wooden block? What is its gravity?

6. The mass ratio of two objects A and B is 5:3, and the density ratio is 10:3. If they are all immersed in the same liquid, the ratio of the buoyancy forces they experience is ( )

A.5∶3 B.10∶3 C.2∶1 D.1∶2

Use your brain

Observe how the buoyant force on the stone changes from when it touches the water to when it is submerged. Can you explain the observed phenomenon?

In conclusion

1. The definition and direction of buoyancy.

2. Causes of buoyancy

3. Archimedes’ Principle

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Update Time: 2024-06-28

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