"Drilling Wood to Make Fire" PPT Courseware

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"Drilling Wood to Make Fire" PPT Courseware

Part One: The definition of drilling wood to make fire

Wood itself has no fire, so where does fire come from?

The two pieces of wood rub against each other, generating heat. The heat generated has no time to diffuse into the air. It accumulates more and more, and the temperature gradually rises. Finally, sparks are generated, causing the wood to burn.

[Definition of making fire by drilling wood]

Drilling wood to make fire is based on the principle of frictional heat. The wood material itself is relatively rough. When rubbed, the friction will generate heat. In addition, the wood itself is flammable, so fire will occur. The invention of drilling wood to make fire comes from ancient Chinese myths and legends. Suiren is the legendary person who invented the method of drilling wood to make fire.

Matches are a fire-making tool that can generate friction and ignite based on the principle of friction and heat generation by objects, using the chemical activity of strong oxidants and reducing agents.

Do you know the energy conversion relationship in these phenomena?

Please rub your palms together now and feel if your palms are getting warm?

These phenomena are examples of the conversion of mechanical energy into thermal energy.

Part 2: I will do it

1. The phenomenon of drilling wood to make fire illustrates that mechanical energy can be converted into ______.

2. The following is a phenomenon of frictional heat generation ( ).

A． Steam comes out of the cooking pot B. Iron bars become thicker after heating

C. When the plane landed, the landing tires skidded and caused sparks.

3. The phenomenon of frictional heat generation is ( ) important to our lives.

A． Disadvantage b. Favorable c. Sometimes it's good, sometimes it's bad

4. Have you ever seen a shooting star? Guess how it was formed?

Keywords: Qingdao version fifth grade science PPT courseware for the second volume free download, Drilling wood to make fire PPT download, .PPT format;

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"Drilling Wood to Make Fire" PPT courseware download:

Download the PPT courseware of "Drilling Wood to Make Fire" Part One: Introduction of new lessons According to records, all kinds of food eaten by ancient people were raw. Therefore, people's life span is relatively short, usually around the age of twenty, and a special phenomenon occurs by chance. That..

"Drilling Wood to Make Fire" PPT download:

The first part of PPT download content of "Drilling Wood to Make Fire": The Legend of Drilling Wood to Make Fire. The earliest primitive people did not know how to use fire. They ate everything raw. Eating raw plant fruits was not just the wild beasts they had beaten. They were also eaten alive, with hair and blood on them. Later,...

"Drilling Wood to Make Fire" PPT:

"Drilling Wood to Make Fire" PPT Part One Content: Drilling Wood to Make Fire Students, do you know how ancient people used fire? Do you know how people ate before they knew how to use fire? What is the significance of humans starting to use fire? Fire was the first thing humans used...

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Update Time: 2024-09-11

This template belongs to science courseware Qingdao Edition Fifth Grade Science Volume 2 industry PPT template

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