"Drilling Wood to Make Fire" PPT courseware download

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"Drilling Wood to Make Fire" PPT courseware download

Part 1: Importing 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.

It was about 6,000 years ago that Suiren accidentally discovered that the woodpecker used its long and pointed beak to find insects to eat in the small holes in the trees. Because the insect burrowed so deep that the woodpecker's mouth couldn't reach it, it had to use its hard beak to dig in. Unexpectedly, it came out with thick smoke and fire.

Inspired by this, Suiren drilled hard and sharp wood into another piece of hard wood, and drilled out sparks. For this reason, humans have mastered a method of making fire.

Part 2: Asking questions

Can you design an experiment to verify frictional heating?

Develop an experimental plan:

How is your group planning to conduct this experiment?

How will your team divide the work?

Kind tips

1. In order to make the experimental phenomenon more obvious, the friction time can be longer.

2. Pay attention to experimental safety, operate the equipment correctly, and do not hurt your hands.

3. Work in groups and proceed in an orderly manner.

If you encounter problems during the exploration process, please raise your hand and report to the teacher at any time.

Part Three: The Principle of Making Fire by Drilling Wood

Combustion requires two conditions: one is enough oxygen; the other is reaching the temperature of the ignition point of the combustible.

When drilling wood, friction will generate heat. When this heat accumulates to a certain temperature, it will reach the ignition point of the wood chips. Because there is enough oxygen in the atmosphere, a fire will form. Therefore, the essence of drilling wood to make fire is to generate heat through friction.

From the perspective of energy conversion, the process of drilling wood to make fire is the process of converting mechanical energy into thermal energy.

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

For more information about the PPT courseware "Drilling Wood to Make Fire", please click on the PPT tab of "Drilling Wood to Make Fire".

"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 courseware:

"Drilling Wood to Make Fire" PPT Courseware Part One: The Definition of Drilling Wood to Make Fire There is no fire in wood itself, so where does fire come from? The two pieces of wood rub against each other and generate heat. The generated heat has no time to diffuse into the air. It accumulates more and more, and the temperature gradually rises...

"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: 2024-07-02

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

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