Kazoo

Cut a piece of tissue paper the same length as a plastic comb (make sure the comb’s teeth are close together). Fold the tissue paper in half, wrapping it around the teeth of the comb.  Place it lightly between your lips and hummm… you’ll feel an odd vibrational effect on your lips as your kazoo makes a sound! You can try different papers, including waxed paper, parchment, tracing paper, and more!


Poppers

Cut the neck off a small balloon (balloons made for water bombs work well) and stretch it over the opening of a film canister. Pinch the drum head and pull up before you release – POP! You can change the pitch by adjusting the stretch of the drum head.
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Bobby Pin Strummer

Straighten three bobby pins. (A bobby pin, when straightened, has two different sides – a smooth side and a rippled side.) Wrap a rubber band tightly around the base of an empty tin can. Slip a clothespin under the rubber band, jaw-end first so it clamps onto the rim. Place three clothespins around the rim of the soup can equally spread apart (about 120 degrees apart). Clamp the rippled end of a bobby pin into each clothespin, so that your contraction now looks like a can with three legs. Strum each pin, one at a time. What happens if you clamp the pins at different heights?


What’s happening? Plucking the pins is just like plucking the string of a guitar, and when you change the heights, you’re changing the pitch. When the pin is shorter, it tends to vibrate faster, thus giving you a higher pitch.


String Test

Push the end of a length of string and a length of light thread through one hole punched in the bottom of a can. Tie the ends inside the can to a paperclip so they stay put. The can should have two different strings coming out of the bottom. Place the can near your ear as you strum each strand (hold the light taut while you pluck it – you may need an extra set of hands.) Can you make the pitch go both high and then low? What other types of string (yarn, thread, clothesline, heavy string, steel cable, fishing line, etc. ) can you use?


What’s going on? When you pluck the string, it starts vibrating (moving back and forth really fast). The vibration in the string starts the bottom of the cup vibrating, which starts the air inside the cup vibrating, too! The cup helps focus those vibrations (sounds) to your ear.


Styro-Phone

Make yourself an old-fashioned telephone by punching a small hole in the bottom of two cups (foam, paper, tin soup cans… is there a difference?) and threading string into each one. Tie the end of the string inside the cup to a paper clip so the string stays put. Does the string need to be tight, or does it work when its loose? How can you go around corners?


What’s going on? When you talk into the cup, you are making the air molecules bang around (vibrate), and some of them bang into the end with the string, which also picks up the vibration. The vibration continues along that string and into the receiver cup, which focuses the sound so you can hear it. The cup channels your voice into the other person’s ear.


Variation: Cut the phones apart and tie each end to a slinky and test it out (we call these “Space Phones”, and after you try it, you’ll see why). What happens when you bang the slinky into different things (like walls, metal chairs, wood tables, or the floor)?


Mystery Pitch

Blow across the mouth of an empty soda or water bottle to make a whistling sound. Add a little water and try again. Add more water and try again. Add more water. What happens if you use a glass bottle?


Place an empty glass under the sink faucet and tap the side of it with a fork and listen to the sound. Slowly fill the glass with water while you continue to tap. What happens if you use a spoon? Knife? Whisk? Wooden spoon?


Which of the experiments above (adding water to the bottle or removing water from the bottle) increases the pitch and which decreases the pitch?


Sonic Rulers

Hold one end of a ruler tightly on the table, overhanging half the length off the table. Pluck the free end and listen… (lift and let go… WHAP!) What if you make the free end of the ruler shorter? Longer? Wood? Plastic? Metal? Two rulers? Stacked? Side-by-side?


Sneaky Clocks

Place an alarm clock (the kind that ticks) or a timer that is ringing on a table and listen. Now place your ear on the table. Fill a zipper bag of water and press it between you and the clock to hear the difference. Next, place the clock in a closed metal can (like a cookie tin or coffee can). What about a paper bag? A glass jar? A newspaper-filled shoebox?


Shoebox Guitar

You can illustrate the vibrating string principle using a guitar string – when you pluck the string, your ears pick up a sound. If you have extra rubber bands, wrap them around an open shoebox to make a shoebox guitar.  You can also cut a hole in the lid (image left) and use wooden pencils to lift the rubber band off the surface of the shoebox.
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Comments

14 Responses to “BONUS! Nine Sonic Vibes Experiments to Mystify Your Kids”

  1. Michelle Rahner says:

    We are also confused about the can and the bobby pins. Can you put up a picture or video to show what it is supposed to look like? Also, are there supposed to be three or four clothes pins altogether?

  2. I totally should have made a video for this – I am sorry! Maybe I’ll add it to my video shoot list. I have about 50 videos right now we’re working on and perhaps I can stick it on the list. To answer your question, though, no you don’t grab it with your teeth – just loosely hold it there with your lips – very loosely.

  3. Becky Ulrick says:

    the kazoo experiment did not work, are you supposed to wrap the tissue paper in between the teeth of the comb?

  4. Michelle Stevens says:

    The instructions for the kazoo were very vague. Did you mean to take the tissue paper and weave it in and out? And how are you supposed to have a length of tissue paper just as long as the comb wrapped around the whole way if it’s folded in half? HELP!

  5. Wendy Beard says:

    For Popper experiment, add water to the canister for a new sound! Shake the canister to coat the balloon with water then pull the balloon for the pop. Keep pulling for a different sound each time it is popped. The sound changes as the water is shaken off. My boys’ favorite sound is when the balloon is stretched the tightest over the canister without water coating the inside.

  6. Wendy Beard says:

    Not sure what we did wrong with the tissue paper and comb, but we made a nice kazoo sound without the comb. We curved wax paper lightly against our lips and hummed a song.
    Thanks! 🙂

  7. There’s a lot that goes into an MP3 player, including electronics, software, and more… but if you’re interested in computer technology, check out Unit 14.

  8. Layan Muhammad says:

    how do you make a mp3 player

  9. Hi MIranda,

    Sorry for the confusion! That’s why nearly all our experiments have videos. I am not sure why this one was skipped, so let me see if I can help. Yes, you spread the clothespins out equally around the rim of the soup can. You’re basically clamping the bobby pin to the side of the soup can so that when you pluck the bobby pin, the vibrations are transferred and amplified by the can.

  10. Richard Gress says:

    What is the bobby pin strummer supposed to look like? The directions are confusing! When you say “add three clothespins” Where are the three clothespins that are 120 degrees apart supposed to be? sticking up against the can under the rubber band, or downwards under the can?? around the rim of the can? Do I turn the open end of the can upside own to stand on the bobby pins or the clothespins?

    Help!!

    Miranda

  11. Mary Thomas Jackson says:

    I really like these experiments!

    -Charli (7th grader)

  12. When you fill a bottle with water, the space above the bottle is a tube of air. When you smack the bottle with a fork (or blow across the top), it makes the bottle vibrate. The longer this tube of air (the emptier the bottle), the slower the vibration and the lower and deeper the sound.

    When you fill the bottle and hit the side, you’re getting the sound of the container itself, which is going to change depending on how full your bottle is. The larger the container (which is bottle + water), the deeper the sound.

    In the first case, you’re getting the vibration from the air. In the second, you’re getting it from the object itself. Does that help?

  13. My son completed the Mystery Pitch Experiment. Can you explain the reason for the change in pitch?
    Sharon