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

Description

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

learning target

1. Through experimental exploration, understand buoyancy and know the direction of buoyancy;

2. Understand the causes of buoyancy through experimental exploration;

3. Through students’ experimental exploration, they will know which factors are related to the size of buoyancy, and know Archimedes’ principle;

4. Can calculate the buoyancy force.

Thinking starter

When a wooden block is placed at rest on a level ground, it is acted upon by _________ and _______. The relationship between these two forces is: ____________.

When a wooden block is placed in water, it floats upward and finally rests on the water. The block of wood is acted upon by _______ and ______. The relationship between these two forces is___________

buoyancy

Self-study guide 1

Read the textbook P75-76 carefully, and after 2 minutes, watch the demonstration experiment and answer the following questions:

1. What forces are exerted on the stone in picture A? What does size matter?

Why does the spring dynamometer indication in picture B become smaller?

What does Picture C illustrate?

2. What is buoyancy? In the concept of buoyancy, what conditions does "immersion" include?

"Immersed" includes "partially immersed" and "completely immersed"

3. What are the force-receiving objects and force-exerting objects of buoyancy? What is the buoyant force on the stone in Figure C?

The force-receiving object is an object immersed in a liquid, and the force-exerting object is a liquid

4.What is the direction of buoyancy?

Always pointing straight up.

1. Definition of buoyancy:

An object immersed in a liquid (or gas) is pushed upward by the liquid (or gas). This force is called buoyancy.

2. Direction of buoyancy: always vertically upward.

3. Buoyant force-exerting object: liquid or gas

4. Method 1 to find the buoyancy: weighing method

(1) First measure the gravity G of the object.

(2) When the object is placed in the liquid at rest, read the indication G´ of the spring dynamometer.

(3) Find the buoyancy force based on the balance knowledge of forces: F buoyancy = G – G´.

Thinking: Why do objects experience upward buoyancy?

Tip: The internal pressure of a liquid increases with depth.

Why does an object experience an upward buoyant force?

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

1. The reason for buoyancy: liquid has upward and downward pressure differences on objects.

2. Method to find buoyancy: (pressure difference method)

Formula: F float = F up - F down

3. Applicable conditions: Regularly shaped cylinders, cubes, etc. (cylindrical container)

Gas station

As shown in the picture: A and B are objects that can move freely, and C and D are objects that are tightly attached to the container with wax. Pour some water into the container as shown in the picture. Then which of the following statements is wrong ( )

A. Object A must be affected by buoyancy

B. Object B must be affected by buoyancy

C. Object C must be affected by buoyancy

D. Object D must be affected by buoyancy;

summary

1. Definition of buoyancy: When an object immersed in a liquid (or gas) is pushed upward by the liquid (or gas), it is called buoyancy.

2. Direction of buoyancy: always vertically upward.

3. Buoyant force exerting object: liquid or gas.

4. The cause of buoyancy: the difference in upward and downward pressures exerted by the liquid on the object.

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For more information about the PPT courseware "Pressure and Buoyancy Explore Factors Affecting Buoyancy", please click the Pressure and Buoyancy ppt Explore Factors Affecting Buoyancy ppt tag.

"Exploration - Factors Affecting Buoyancy" Pressure and Buoyancy PPT Courseware 4:

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"Exploration - Factors Affecting Buoyancy" Pressure and Buoyancy PPT Courseware 3:

"Exploring Factors Affecting Buoyancy" Pressure and Buoyancy PPT Courseware 3 Teaching Objectives Knowledge and Skills (1) Through experimental exploration, understand buoyancy, know that the force that an object immersed in a liquid is lifted up by the liquid is called buoyancy, and know that the direction of buoyancy is vertical Straight upward; ..

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

"Exploring Factors Affecting Buoyancy" Pressure and Buoyancy PPT Courseware 2 Independent Exploration, Communication and Cooperation, Display and Reporting What effect does water have on objects placed in it? Whether an object is floating on the water or submerged in the water, it will experience the upward force exerted on it by the water.

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Update Time: 2024-10-27

This template belongs to Physics courseware Beijing Normal University eighth grade physics volume 2 industry PPT template

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