"Who Made the Wind" What will the weather be like tomorrow PPT courseware

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"Who Made the Wind" What will the weather be like tomorrow PPT courseware

1. Let’s feel the wind.

Scientific inquiry 1: Man “creates” wind

Do it:

Is there any way you can create wind?

How do you know you created the wind?

discuss

1. When we shake the fan, we feel the wind. What is the reason for this?

2. What other ways can produce wind in life? What causes wind?

Wind caused by electric fans, air conditioners, etc. These methods use external force to move the air (external wind).

How is wind formed?

Wind is caused by the movement of air. Who makes the wind in nature move?

air movement creates wind

Why does air flow?

Use tools or human power to push air flow to create wind.

Experimental requirements:

1. First find experimental equipment according to the experimental plan, and then divide the labor into experiments.

2. Pay attention to fire safety and put out the fire immediately when you see the phenomenon.

3. What does the discussion of experimental phenomena indicate?

Kind tips

Safety Tips: Be careful not to get burned by fire

Operational Tips: Team members should clearly define their division of labor and cooperate sincerely

discuss

What does the experimental phenomenon show?

Wind is caused by temperature differences causing air to flow

Why does the air move?

The smoke drifts into the bottle because the heat generated by the burning candle heats the air inside the bottle. The hot air rises, and the cold air outside the bottle flows to supplement it, thus forming wind.

think about it

On the seaside, during the day, the temperature of the land is higher than that of the sea surface; at night, the temperature of the sea surface is higher than that of the land.

Please guess based on this situation: What is the difference in the wind direction during the day and night on the beach?

Everywhere on the earth is absorbing heat from the sun, but due to the uneven heating of each part of the ground, the degree of coldness and warmth of the air is different. Therefore, the warm air expands and becomes lighter and then rises; the cold air cools and becomes heavier and then falls, so The flow of warm and cold air creates wind.

Where does wind serve us?

1. Wind causes air movement to bring precipitation and snowfall.

2. Large-scale air flow causes ocean current movement to balance the heat distribution of seawater.

3. Adjust the temperature difference in the atmosphere and spread the rising hot air currents from the equatorial region to the poles.

4. Pollination and reproduction of wind-pollinated plants.

5. Wind energy generation.

6. Air purification, diffusion of polluted air, etc.

There are also relatively rare typhoons and tornadoes

Typhoons and hurricanes bring abundant rain to vast areas and become rainfall systems closely related to human life and production. However, typhoons always bring all kinds of damage. They are sudden and destructive, and are one of the most serious natural disasters in the world.

Things to note in windy weather include the following:

1. Try to avoid the "narrow tube effect" when walking or cycling. Be careful not to use the narrow passages between high-rise buildings when walking or cycling. Because long and narrow passages will form a "narrow tube effect", the wind force will increase in the passage, which will bring certain dangers to pedestrians.

2. Be careful not to stay under billboards and old trees for a long time.

3. Pay attention to riding bicycles as little as possible.

4. Take protective measures when going out. Be careful to bring dust-proof supplies such as masks and gauze.

expand

(1) What did you learn through today’s study?

(2) What else do you know about the wind? Please look up relevant information outside class and then communicate with your classmates.

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"Who Made the Wind" What will the weather be like tomorrow PPT courseware 4:

"Who Made the Wind" What will the weather be like tomorrow PPT courseware 4 Discussion How is the wind formed? Who has so much power to make the air flow? Observe any changes in the flow direction of the mosquito cigarette? What does the experimental phenomenon show? Why does air flow...

"Who Made the Wind" What will the weather be like tomorrow PPT courseware 3:

"Who Made the Wind" What will the weather be like tomorrow PPT courseware 3 Discussion How is the wind formed? Who has so much power to make the air flow? Observe any changes in the flow direction of the mosquito cigarette? What does the experimental phenomenon show? Why does air flow...

"Who Made the Wind" What will the weather be like tomorrow PPT courseware 2:

"Who Made the Wind" What will the weather be like tomorrow PPT courseware 2 Question Discussion 1. What methods can produce wind in life? 2. What causes wind? 3. How to make air flow? How is wind produced in nature? Experimental requirements: 1. First design the experimental method...

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Update Time: 2024-11-21

This template belongs to science courseware E-education edition fourth grade science volume 1 industry PPT template

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