How to Make a String Phone
Materials Needed
- 2 paper cups
- String
- Sharpened pencil
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Want to send a private message to a friend? I will show you how to make
a string phone. You talk into the cup on your end of the string and the
sound comes out through the other cup and only your friend can hear you.
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Take two paper cups and poke a small hole through the center of
the bottom of each cup; a pencil tip will work for this. The hole
should only be big enough to fit the string through, don't make the
hole too big.
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Poke the end of the string through one of the cups and tie a knot
on the part that is inside the cup.
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Make the string as long as how far away you will be from the other
person.
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Poke the other end of the string through the hole in the other cup
and tie a knot so it will not pull through the cup.
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Now that you have a cup on each end of the string, it is ready to
try.
Hold the cup up to your mouth and talk a little loud into it. Have your
friend hold the other cup up to their ear. It is important that you keep
the string tight between the cups and that nothing is touching the string.
Now your friend should be able to hear your message through the cup..
How it works is that when you talk into the cup, your voice vibrates
the string. The vibrations travel through the string like how waves travel
through water. When the vibrations reach the other end, they vibrate
the bottom of the cup and turn back into sound waves which your friend
can hear.
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