Find five things that make a sound

Sound Success Criteria Today you will: Describe how sound is produced and travels Explain why sound cannot travel through a vacuum Compare the speed of sound in different materials

How is sound produced? Think about the sounds you identified earlier… how were they are created? If you put your hand gently on your throat and hum – what can you feel? Vibrations

States of matter recap How are the particles arranged in different states? Solid Liquid Gas How might the arrangement of particles effect the speed of sound?

How does sound travel? Student demonstration Sounds do not reach us immediately; they take time to travel through materials. They travel through vibrations of particles.

Mini investigation Do you predict that the sound will travel better through air or through the coathanger and string?

Is there anywhere that sound can’t travel? Why can’t sound travel in space?

Sound Success Criteria Today you will: Describe how sound is produced and travels Explain why sound cannot travel through a vacuum Compare the speed of sound in different materials

Comparing speeds Use the information in the table to complete the sentences: The speed of sound in air is… Sound travels fastest in solids/liquids/gases. A sound travelling along a steel rod and an identical wooden rod would reach the end of ___________ first because ______________________________.

Comparing speeds Challenge: Explain why sounds do not travel as quickly through liquids as through solids.

Sound Success Criteria Today you will: Describe how sound is produced and travels Explain why sound cannot travel through a vacuum Compare the speed of sound in different materials

Do thunder and lighting happen at the same time?

What do these have in common? Supersonic What do you call something that travels faster than the speed of sound?