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Science Rocks!


String Telephone

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your results

Sent in by:
Betsy of Bronx NY

Rrrring, rrrring, rrrring. It's a telephone made from string.
Materials

Materials Needed


  • two plastic cups
  • some string
  • paper clips
  • sharpened pencil for poking holes

Instructions

Instructions


  1. With the pencil, carefully poke a small hole in the bottom of each plastic cup.
  2. Tie the paper clip to one end of the string.
  3. Thread the other end of the string through the hole in the bottom of one of the cups. Be sure to thread it from the inside of the cup. The paperclip will keep the string from going all the way through the hole.
  4. Then thread the string through the hole in the second cup, but this time do it from the outside of the cup.
  5. Tie the second paper clip to the other end of the string. The paper clip should be inside the cup, just like the first paper clip.
  6. Then, pull the cups so that the string is tight and have one person talk into the cup while the other person holds the cup to their ear.


Now it is time for you to experiment. Think of a question you want answered. Like, what is the farthest distance you can get the telephone to work using string? Would the sound go farther if you used empty soup cans instead of plastic cups? What about using two different sized cups? Make a prediction. Then change one thing-that's the variable-and test it out. Be sure to tell us what you thought was going to happen and what actually did happen. When you're done, send your reports to our special feedback area. Every week we'll post new results from ZOOMers' string telephone experiments.

Some of your Results

Madeline, age 14 of Cincinnati, OH wrote:
I used this with my friends today and we had a blast!!!

Karina, age 9 of Florencia wrote:
it worked really well!! my brother and I had them all over the house and we could hear each other thru every phone! BTW... this was the best experiment that I have ever done, and I have done a lot of experiments

Gracie, age 7 of NC wrote:
we used those today they where COOL!

Camryn, age 8 of NC wrote:
We made these in class today. I could hear my freinds voice

Courtney, age 8 of Newton, NC wrote:
I haered my freinds voice through a stire phone. I didin't know that it could do that. It was a fun experement.

Abby, age 8 of NC wrote:
I was so cool! I could hear my friend Derek. You had to pull the string tight or you could not hear them. He said "Can you hear this?"

Joshua, age 8 of Newton, NC wrote:
i heared my friends voise.

Pierce, age 7 of Newton, NC wrote:
what happened to me and my partener.

Caleb, age 8 of Newton, NC wrote:
I cold here hem

Hunter, age 8 of NC wrote:
I had someone hold then we tolckt to we had fun.

Layne, age 8 of NC wrote:
my parner jacob and me tried to do that and it worked it was fun.

Irvin, age 7 of Newton, NC wrote:
we did this today in class. I could hear my friend it worked well

Rachael, age 8 of Newton, NC wrote:
what happen to me and my parter grase is that I could here her after she spoke a little bit more! I dont now if she coud her me, but I think she did not her it! I thought it was not going to work but it work! I think she will say it is verey cool!!!

Dylan, age 7 of Newton, NC wrote:
what happened to me and I cand biler hear it. I hear it!

Jacob, age 8 of Newton, NC wrote:
I like making string telohone you use 2 paperklep 2 cups and 1 string.

Ariel, age 8 of Newton, NC wrote:
win I did it I could hier my perner it was fun to do it.

Derek, age 8 of NC wrote:
we made phones I heard Abby.

Kaidn, age 7 of Newton wrote:
when I heard it it travld a vivbraion to my ere.

Jahtaya, age 9 of Brampton, ON wrote:
i did it at school and when my partner said something I could hear sound but not what she was saying

B School of HI wrote:
When we tried it it worked really well but you have to pull it tight or else it would not work but if you pull it tight you can hear them in a different voice.

B School of NT wrote:
that is cool I can hear the person im talking to

B School of HI wrote:
you could here theother person talking threw the cup

B School of TX wrote:
You stand far apart and put it on your ear you can hear the other person talk.

B School of HI wrote:
It worked

B School of NY wrote:
You stand far apart and your ear on it and another person talks

B School of HI wrote:
when we did this project it worked. It was really fun and cool. we had a short distance converstation!!!

B School of TX wrote:
it was asome

B School of DC wrote:
IT WAS AWSOME! We heard each other.YA

B School of NE wrote:
From the start I thought it wouldn't work, but IT DID!

B School of KY wrote:
Me and my friends did it with three people and it worked exelent!

B School of HI wrote:
the telphone worked I really didn't expect it but it worked

B School of NJ wrote:
This project worked great! Me and my friend tryed it and we could hear each other perfectly fine. We think this project is really cool! It was an easy project and it worked. We decided to do this another time. It worked great.

B School of HI wrote:
WOW! this worked great. But you have to set it up right or it wont work. Me and my friend tried it. It also works with a three way. For this part you have to tie it to the center of them both. If you talk at the same time it wont work but if you talk at ounce and clerrly you can hear them.

Grace, age 10 of NJ wrote:
It was kinda hard to make but now it is so much fun and I use it as a intercom.


not yet implemented