"The Generation of Sound" PPT

Description

"The Generation of Sound" PPT

Part 1: Exploring the production of sound

Experiment 1: Student rubber band experiment

Work in pairs, one person stretches the rubber band and tightens it, and the other person moves the rubber band with their hands.

⑴What can you hear? What state is the rubber band in at this time?

⑵When the vibration stops, can you still hear the sound?

Experiment 2: Scale vibration experiment

Two-thirds of the scale extends out of the edge of the table. Press one-third of it tightly against the edge of the table with one hand, and flip the extended end with the other hand.

1. Can you hear the sound? What state is the ruler in at this time?

2. When the vibration stops, can you still hear the sound?

Experiment 3: Encourage confetti experiment

*Put paper scraps on the drum surface and hit the drum surface

*Press the drum head with your hand to make no sound

Comparative thinking: Under what circumstances are the confetti bounced? Under what circumstances does it stand still?

Part 2: Thinking and discussing issues

(1) In the above experiments, are the objects making sounds the same? Does it make the same sound?

(2) What are the similar phenomena when these objects make sounds?

(3) Based on this, how is sound produced?

in conclusion

Sound is produced by the vibration of an object. When the vibration stops, the sound stops.

Part Three: Classroom Exercises

⒈The sound is produced by ( ) of the object. When ( ) stops, the sound stops.

⒉The object that is making sound is called ( ), ( ) can make sounds and can be used as a sound source.

3. Sprinkle some small paper scraps on the drum surface and tap it. When you hear the sound of the drum, you will notice that the small paper scraps are on the ______. This phenomenon can mean that the object making the sound is on the ______. Press it with your hands. Hold the drum head, ______ stops, and the sound of the drum disappears.

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Update Time: 2024-11-22

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