"Playing Basketball" PPT Courseware 2

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"Playing Basketball" PPT Courseware 2

Let’s talk about it: Why can basketball bounce?

Flat (biě): unable to play

Insufficient: unable to play high

Full of gas: bounce very high

think:

1. What happens to the volume of air in the syringe?

2. Why does the volume of air in the syringe change like this?

3. How does the piston move when you release your hand? What causes the piston to move like this?

Expansion: cheer for basketball

To inflate a deflated basketball, approximately 3000mL of air is needed when it first becomes round (the volume of a primary school basketball is approximately 3000mL). What happens to the newly rounded basketball?

It's a bit soft, can't bounce, doesn't bounce high.

Continue to inflate the basketball: We added about 2000ML of air into the basketball. What's the situation with basketball at this time?

Hard and bounces high.

Let’s talk about it:

1. What happens to the air in the syringe and basketball after it is squeezed?

When the air in a sealed container is under pressure, it will be tightly compressed together and occupy less space. (Air can be compressed)

2. What are the properties of the air that has undergone this change?

Compressed air is elastic

Compressed air applications

Compressed air has many uses. Injecting compressed air into the tires of cars and bicycles can not only support the weight of the car body and all objects on the car, but also make drivers and bikers feel stable and comfortable. Cars, walls and furniture can be spray-painted using paint in a can mixed with compressed air. Using compressed air to spray unclean masonry buildings can wipe away the dirt on the surface of the masonry. In addition, compressed air is used in many places such as hovercraft, nail guns, car door switch control, construction, and medical treatment. 1. The pneumatic picks used to dig into the ground on the road use compressed air. 2. The doors of buses are opened and closed with compressed air. 3. The brakes of some cars are also driven by the power of compressed air. 4. Dentists use A drill driven by compressed air. 5. If the drain pipe in your home is blocked, you can use compressed air to clear it. 6. The sprayer used to apply water to trees contains compressed air...

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"Playing Basketball" PPT courseware:

"Playing Basketball" PPT courseware Air is a colorless, odorless, transparent gas. Know that air actually exists and air must occupy space. Air can be compressed and becomes elastic after compression. Other applications of compressed air. Air occupies a certain space,...

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Update Time: 2024-11-17

This template belongs to science courseware Fourth-grade science volume 2 of the E-education edition industry PPT template

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