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

Description

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

teaching objectives

Knowledge and skills

(1) Through experimental exploration, understand buoyancy, know that the upward force of an object immersed in a liquid by the liquid is called buoyancy, and know that the direction of buoyancy is vertically upward;

(2) Through experimental exploration, we know that the cause of buoyancy is the difference in upward and downward pressures exerted by the liquid on the object;

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

(4) Be able to find the magnitude of buoyancy.

Process and Method

(1) Through experimental exploration, understand the process of buoyancy and cultivate students’ observation and analysis abilities;

(2) Through experimental exploration, understand the causes of buoyancy and cultivate students’ observation ability and ability to use knowledge to analyze and summarize;

(3) Through students’ experimental inquiry, we will know which factors are related to the size of buoyancy, cultivate students’ scientific inquiry abilities such as conjecture and hypothesis, experimental design ability, and cultivate students’ orderliness in conducting experiments in a step-by-step manner.

Emotional attitudes and values

(1) Through experimental exploration, cultivate students’ scientific attitude of respecting science and seeking truth from facts.

(2) Cultivate students’ communication awareness, cooperative spirit and ability through cooperative communication in the experimental inquiry process.

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: ______________.

Thought link

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 _______________.

Information Express

1. Definition of buoyancy: An object immersed in a liquid (or gas) is pushed upward by the liquid (or gas), which 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 and is stationary, read the indication G´ of the spring dynamometer

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

Information Express

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

2. Method 2 for finding buoyancy: Reason method (pressure difference method) Formula: F float = F up - F down.

3. Applicable conditions: Regularly shaped cylinders, cubes, etc.

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 incorrect:

A. Object A must be affected by the buoyancy force; B. Object B must be affected by the buoyancy force;

C. Object C must be affected by buoyancy; D. Object D must be affected by buoyancy;

Archimedes' principle

1. Content: An object immersed in a liquid experiences an upward buoyant force. The magnitude of the buoyant force is equal to the gravity of the liquid displaced by the object.

2. Formula: F float = G row = ρ liquid gV row

3. Scope of application: liquids and gases. It is a universally applicable formula for calculating buoyancy.

Gas station

1. When swimming, people move from shallow water to deep water. The deeper the person goes, the greater the buoyancy force they experience. Why is this?

2. What is the buoyant force on an iron block with a mass of 7.9� when it sinks to the bottom of the water? (ρ iron = 7. 9 × 103kg/m3)

3. There is a bridge pier with a volume of 400m3 in the river water. What is the buoyancy force of the river water on the bridge pier?

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Update Time: 2024-10-28

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