Sound in 2nd Class

Sound is an energy, caused by vibrations that makes sound waves.

We completed a dancing rice experiment to see sound vibrations. We made ‘String telephones’ to hear sound waves.

We investigated which material would be the best sound insulator. We measured how far away from the sound we needed to walk before the sound disappeared when blocked by each material. We predicted that the cardboard box would be the best sound insulator and we were right!

Some materials allow sound to pass through them easily. Other materials absorb sound.

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2nd class Investigates :The Science of Sound

Experiment 1: Count the Taps!

What were we investigating?

Do sound waves travel better through a gas or a solid?

What did we do?

We learned that the air that we talk through is a gas and it can be interfered with by things like the wind.

We tested to see if we could count a tapping noise more clearly if we listened with our ear on the desk.

What did we learn?

In a solid you can hear the sound waves clearly. We weren’t sure however, if they were clearer.

Experiment  2: Making Rice Jump

What were we investigating?

Can we see sound waves at work?

What did we do?

We placed some cling film over a bowl and then placed some rice on top of the cling film. We then banged a drum close to the rice to see if the sound waves could make the rice jump.

What did we learn?

Even from a distance away the sound waves travelled from the drum hit the cling film and made the rice jump. Even though they are invisible we can see the force moving the rice.

Experiment  3: String Phones

What were we investigating?

Can we make a “phone” to send a message from our class across the front of the school to Mr Scott’s room (Room 5)?

What did we do?

Step 1: We designed and made our own string phone’s and tested them to see if they worked.

One group tried putting two strings in their phone.(It didn’t seem  to work any better)

Step 2: We measured to see how far apart our phones stretched and we tested to see if the sound got weaker on the longest phones.

Step 3: We then made another test string phone 4 metres long and we tested to see if it still worked.

Step 4: We measured the distance from our classroom to Mr Scott’s using a trundle wheel. It was  21 metres and 61 centimetres window to window.

Step 5: We made our new extra-long string phone. We sent a group down to Room 5  to listen for the message and left  two children in our class to call  it out.  Nobody but the callers knew the message (It was: “ Ireland are going to win!”).

Step 6: We  decided to do a final test to see if we could “listen in” on the line between the two classrooms.

What did we learn?

We learned lots but the most important bits are:

• The string has to be pulled tight for the phone to work well
• Putting two strings on the phone might actually make it harder to hear a message.
• The quality of the phone does not diminish between 1 and 4 metres.
• On a very long string- phone the message isn’t as clear as on a short one but we were still able to  work  out the message that was transmitted.
• By attaching another string to the main line we can “listen in”.

my sound project

SOUND VIBRATIONS CAN TRAVEL THROUGH

• solid metal, wood and concrete
• sound can vibrate through water and liquids

did you hear something? maybe

the sound you heard was as quiet as

your cat licking her paws.Or maybe

it was loud, like a siren going by.

sounds are everywhere ,and you

have two cool parts on your body

that let you hear them all:

your ears are in  charge of collecting sounds,

processing them, and sending sound signals to

you to keep balance. So if you bend over to pick

up your cat, you won’t fall down -or even worse-

fall on your cat. MEOW !

sounds are made when a objects vibrate.

the vibrations makes the air around

vibrate, and the air vibrations enter

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Dublin Science Festival

Click on the link below for information on ‘The Festival of Curiosity’ taking place in the RDS from 25th-29th of July. This unique event will provide an opportunity for parents, families and the public to interact with science as a cultural activity outside of the academic year.

Dublin Science Festival

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