Did you know that before Spotify, before iTunes, and even before CDs, people bought music on huge (30cm x 30cm!) plastic disks called records? If you knew that, we're already impressed. But there's something you may not know: you don't even need electricity to play a record!
Unlike CDs, which store data in bits (either a 1 or 0, which a computer can understand), records are what is known as "analog." This means that instead of containing digital computer language, records are etched with little bumps. When the needle of a record player runs along these bumps, the needle vibrates and creates sound waves.
Firstly, be sure to check with a parent before starting this experiment. This experiment will almost certainly damage your record, so you want to make sure the record you are using is not valuable!
To start making your electricity-free record player, roll the paper into a cone, trying to make the tip as pointy as possible, and tape it so it stays. Why do you think this part is important?
Tape the non-pointed end of the needle to the tip of the cone so that the pointed end of the needle sticks out beyond the cone.
Insert the pencil into the small hole in the middle of the record. If it does not fit or the record hole is too large, you may have to be creative--the purpose of the pencil is to spin the record, as you'll see in the next step.
Place the point of the pencil onto a hard surface (you will probably want to put something underneath it, so it doesn't make pencil marks).
Find a labmate to help hold the paper cone up so that the needle is touching the record. Alternatively, you can find something to prop up the paper cone so that the needle is at the same height as the record. You may have to use some tape to get it to stay in place.
With the needle on the record, use the pencil to spin the record clockwise. What do you hear? Try spinning the record faster, slower, or even backwards!
Analysis and Conclusion
Hmm... it seems nobody's added a conclusion
for this experiment yet. You can suggest one here.