"Understanding Buoyancy" Buoyancy and Lift PPT Courseware

Description

"Understanding Buoyancy" Buoyancy and Lift PPT Courseware

Experience buoyancy

What does it feel like when an empty mineral water bottle with a tight cap is pressed into the water?

An object immersed in a liquid is pushed upward by the liquid

An object immersed in a gas is pushed upward by the gas

Consolidate and practice

1. Hang a stone on a spring scale, and the reading is 49N. After the stone is immersed in water, the spring scale reads 34N. What is the buoyancy force on the stone when it is immersed in water?

Solution: F float=G-F=49N-34N=15N

Answer: The buoyant force on a stone immersed in water is 15N.

Experimental exploration: What factors are related to the size of buoyancy?

Conjectures and Assumptions:

⑴ The volume V of the immersed liquid;

⑵Depth of immersion in liquid h;

⑶The density of the liquid ρ.

conduct experiment:

Comparing ①②③, it can be seen that the buoyancy force experienced by an object in a liquid is related to the volume of liquid displaced by the object;

Comparing ①③⑤, we can see that the buoyancy force experienced by an object in a liquid is also related to the density of the liquid;

Comparing ①③④, it can be seen that the buoyancy force experienced by an object in a liquid has nothing to do with the depth of immersion in the liquid.

Summarize

1. Objects immersed in liquid will be supported vertically upward by the liquid. This force is buoyancy.

2. F float = G-F (weighing method).

3. Buoyancy is caused by the difference between the upward and downward pressure of the liquid on the object.

4. The size of the buoyancy force is related to the density of the liquid and the volume of the object immersed in the liquid, and has nothing to do with the shape, material, and depth of the object.

practise

1. Moving stones in the water feels lighter than moving them on the shore, which shows that the stones _________ in the water.

2. The wooden block immersed in water is acted upon by two forces, one is gravity in the direction of ________, and the other is ________. The force-exerting object is _________ in the direction of ________.

3. A stone weighs 20N. Hang the stone on the lower end of the spring dynamometer and immerse it in a certain liquid. At this time, the reading of the spring dynamometer is 14N. Then the buoyancy force of the stone on the liquid is_ _N. The direction of the buoyancy force is ________, the object exerting the force is _______, and the effect of buoyancy force is _________ when the stone sinks in the liquid (fill in "received", "not received").

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"Understanding Buoyancy" Buoyancy and Lift PPT Courseware 2:

"Understanding Buoyancy" Buoyancy and Lift PPT Courseware 2 1. What is Buoyancy Activity 1: Compare the gravity of a metal block in air and water Design experiment: As shown in the figure, use a spring dynamometer, a block, a thin wire, a beaker, and water and other equipment, compare the springs of objects in air and water..

"Understanding Buoyancy" Buoyancy PPT Courseware 2:

"Understanding Buoyancy" Buoyancy PPT Courseware 2 Learning Objectives 1. Know what buoyancy is; 2. Through experimental exploration, realize that objects immersed in liquid or gas are affected by buoyancy; 3. Know the causes of buoyancy. Buoyancy: The force exerted on an object immersed in a liquid or gas...

"Understanding Buoyancy" Buoyancy PPT courseware:

"Understanding Buoyancy" Buoyancy PPT courseware Research purpose: Are objects sinking in the water still affected by buoyancy? (1) Explore the buoyancy of liquids. Question (1) How much gravity is exerted on the object? Does the gravity decrease during the sinking process? Why? (2) It will sink..

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Update Time: 2024-11-23

This template belongs to Physics courseware Guangdong and Shanghai version of eighth grade physics volume 2 industry PPT template

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