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Authoritative PPT Summary
Hunan Education Edition Grade 5 Science Book 1, Can He Move the Earth? PPT
Contents of the first part:
Why did Archimedes say such a big thing? What kind of strange device was he talking about?
The invention of the lever: In order to protect their caves, primitive people often blocked the entrances with large stones. How to move the large stone? By chance, someone placed one end of a tree trunk under the large stone. There happened to be a small stone under the tree trunk near this end. The primitive people pressed down on the tree trunk, and the stone moved without much effort. Thus, the word "pry" was born. The method of using a tree trunk to pry a stone spread.
Fulcrum: When a lever works, it always rotates around a point, which is called the fulcrum.
Power point: When prying the earth, the point where force is applied to the lever is the power point.
Resistance point: The point where the weight is hung is the resistance point.
Can He Move the Earth? PPT, Part 2:
The equilibrium condition of the lever is:
Power × power arm = resistance × resistance arm.
Leverage balance principle description:
When the power arm is larger than the resistance arm, it is a force-saving lever;
When the power arm is equal to the resistance arm, there is neither effort nor saving;
When the power arm is smaller than the resistance arm, it is a laborious lever;
Can He Move the Earth? PPT, Part 3:
Analysis: Under what conditions can Archimedes’ boast be realized?
People made balance scales based on the principle of lever balance.
Finding the “Human Leverage”
Try it, can you find the location of the fulcrum, power point and resistance point?
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