Physics · Grades 1–4
Sound and vibrations
Study guide for Grades 1 to 4: 2 worked examples and 2 practice questions. Sounds come from vibrations. Loudness depends on how big the vibrations are; pitch depends on how fast they are.
Rule and key idea
Sounds come from vibrations. Loudness depends on how big the vibrations are; pitch depends on how fast they are.
vibration → sound; bigger vibration → louder
Worked examples
A drum is tapped gently and then hit harder. What happens to the sound?
A harder hit makes bigger vibrations and a louder sound.
It gets louder.
Which sound is louder: rustling leaves or a lawn mower?
A lawn mower is a loud sound; rustling leaves is a quiet sound.
a lawn mower
Try two questions
Which sound is louder: a fire truck siren or a cat purring?
- a fire truck siren
- a cat purring
Which sound is quieter: a jet plane taking off or a cat purring?
- a cat purring
- a jet plane taking off
Answers and reasoning
Answers and marking notes
- a fire truck siren
A fire truck siren is a loud sound; a cat purring is a quiet sound.
- a cat purring
A jet plane taking off is a loud sound; a cat purring is a quiet sound.
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