"Interesting Transmission" PPT courseware

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Hunan Education Edition fifth grade first volume science, interesting transmission PPT courseware

Part one content

What device does the small motor use to transmit power to the toy wheel?

From the transparent correction tape, you can see wheels of different sizes. The outer edges of these wheels have neat rows of teeth. These wheels are called gears. They can buckle with each other and drive each other.

Try it, when you turn the big gear, how does the small gear turn? Do they make the same number of turns?

1. The large and small gears rotate in opposite directions.

2. When the large gear rotates to the right, the small gear will rotate to the left.

3. Gears can transmit power, change direction or speed.

4. Gears are used in bicycle gearboxes, bicycles and motorcycles to change speed.

Interesting transmission PPT, the second part of the content

A bicycle is made up of some simple machines. Think about it, besides chains and gears, what other simple machines do bicycles use?

Nowadays, bicycles use several simple machines, which are introduced as follows:

(1) Lever: The bicycle handle uses levers to control direction, and the brake handle uses levers to transmit power.

(2) Axle: Between the pedal, crank and large sprocket, as well as between the small sprocket and the rear wheel, the axle principle is used to transmit power.

(3) Gear: The large sprocket drives the small sprocket through the chain, which is driven by gears.

(4) Spiral: Use screws (inclined surfaces) to fix each part.

Interesting transmission PPT, part 3: practice

judge

1. Bicycles only use a simple mechanical principle. ( )

2. There is no pulley principle in bicycles. ( )

3. As long as the wheel axle is used, labor can be saved. ( )

5. The force point and resistance point can only act on both sides of the lever fulcrum respectively. ( )

6. The slope has a labor-saving effect. The greater the slope, the more labor-saving it is. ( )

8. The pattern on bicycle tires is to increase the friction with the ground ( )

1. "As long as you give me a fulcrum in the universe, I can use a long stick to pry up the earth." This is what ( ) said.

A. Newton B. Archimedes C. Aristotle

C. The fulcrum may be between the force point and the key point, or it may not be between the action points of the two forces.

3. ( ) is a machine that combines levers, pulleys, and axles.

A. Fishing rod with fishing reel B. Hand drill C. Eye nail

4. The rotation of the large sprocket on the central axis of the bicycle transmits power to the small sprocket on the rear axle through ( ).

A. Belt B. Lever C. Chain

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"Interesting Transmission" PPT:

The first part of Hunan Education Edition fifth grade science, interesting transmission PPT: What device does the small motor use to transmit power to the toy wheel? From the transparent correction tape, you can see wheels of different sizes. The outer edges of these wheels have neat rows of teeth. These wheels...

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Update Time: 2024-11-21

This template belongs to science courseware Hunan Education Edition Fifth Grade Science Volume 1 industry PPT template

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