Adams Home Learning 15th March 2019

Make a phone.

In science we have been learning that sound is made when an object vibrates. These vibrations travel through the air and other media as waves until they reach the outer ear.

Have a go at making a paper cup phone to show this happening. You will need two paper cups, some inelastic string or fishing wire and two paper clips. Make a hole in the base of each cup, thread through the string and tie a paper clip inside the cup to prevent the string from detaching. Pull the string taut and have one person speak into one of the cups while you listen through the other. The cups can be used to communicate over distances of up to 30m. The paper cup phone works by transmitting sound vibrations along a tightly-pulled string.

Speaking into the cup transmits the sound of the speaker’s voice into the bottom of the cup. The bottom of the cup acts as a diaphragm and vibrates with the sound of the speaker’s voice. As the bottom of the cup vibrates, it transmits the vibrations into the taut string. The sound travels along the string as a wave and ultimately vibrates the bottom of the receiving cup. The cup transmits the sound into the air around the listener’s ear, allowing them to hear the speaker. Because the sound travels through solid mediums – the cup and the string – it travels more effectively than through air, allowing the users to communicate across large distances with volumes that would be inaudible if spoken through air.

Try it out

 

TTRS

Regular Reading

Spellings - Words with the /eɪ/ sound spelt ei, eigh, or ey

vein

weigh

eight

neighbour

they

obey

freight

neigh

journey

chimney

 

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Tuesday, 16 July 2019