"Simple Machinery on Bicycles" Tools and Machinery PPT Courseware 2

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"Simple Machinery on Bicycles" Tools and Machinery PPT Courseware 2

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.

After stepping on the pedal, the large gear, chain, small gear and rear wheel will rotate in sequence...

Pedal: drives the large gear to rotate

Chain: The power of the large gear is transmitted to the rear gear through the chain

Pinion: The rotation of the pinion drives the rear wheels

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.

simple machine on bicycle

1. When the large gear drives the small gear, the rotation speed becomes _______; when the small gear drives the large gear, the rotation speed becomes _______.

2. Bicycles rely on _______________ and human power to move forward.

3. If the large gear has 32 teeth and the small gear has 16 teeth, then the large gear rotates once and the small gear rotates _______ times.

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. ( )

4. The closer the support point of the lever is to the object, the farther it is from the point of exertion, the less effort will be required. ( )

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. ( )

7. When the bicycle moves forward, the gear on the pedal must rotate faster than the gear on the rear wheel ( )

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

simple machine on bicycle

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

2. Which of the following statements about the position of the fulcrum is correct ( ).

A. The fulcrum must be between the force point and the key point. B. The fulcrum must be at one end of the lever.

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

1. What are the simple machines learned in this unit?

Lever, axle, pulley (movable pulley, fixed pulley, pulley block), inclined plane

2. What are the functions of simple machines?

Effort-saving or convenient

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For more information about the PPT courseware "Tools and Machines Simple Machines on Bicycles", please click the Tools and Machines ppt Simple Machines on Bicycles ppt tag.

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Update Time: 2024-06-29

This template belongs to science courseware Science Edition for Sixth Grade Science Volume 1 industry PPT template

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