Sound

Good, good, good vibrations – sound and vibrations experiment

Good, good, good vibrations Sound is actually nothing more than moving air and the way we perceive that moving air with our ears. Now you may be saying "Wait a minute sound is made by moving air?". Sure.  Think about it.  Your dad moves a lot of air - right?  And he makes a nasty sound when he moves it - yes?  Let Reeko Cut off a piece of two foot string (2'). Using a rubber band, attach a metal spoon to the midpoint of the string. Wrap the ends of the string around your fingers. Rest your fingers in your ears (don't stick 'em in too far or you'll poke your brains out!). Standing next to a table, rock your body back and forth…
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Pressure

Plastic cups in love – experimental demonstration of Bernoulli’s principle

Plastic cups in love What does a flying airplane and a pitcher's curve ball have in common. Well, besides the fact that both travel through the air at amazingly fast speeds - both are based on a principle called Bernoulli's principle. Bernoulli, (pronounced Burr New Lee) was a Swiss mathematician who liked to piddle around with these types of things. Now we get to piddle Out of the string, make 2-1 foot long pieces. Using tape, attach one end of the string to the bottom of one of the cups. Take the other end of the string and attach it to a table. Repeat steps 2 and 3 with the second cup. When taping this string to the table, make sure that the cups will…
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Motion/Energy

Milk carton water wheel

Milk carton water wheel Ever held a toy under your running bath water? Did it spin or twist away from you? This is explained by a law proposed by a guy named Sir Isaac Newton. Specifically the law states that 'for every action there is a equal and opposite reaction'. You know, kind of like when you smack your big brother you know you're going to get smacked back. OK, so maybe that's not such a great example. Here's one that will aptly demonstrate Newton's law. Poke a hole in the bottom left hand corner of each of the four faces of a half-gallon, paper milk carton. Now poke a hole in the top flap of the milk carton. Tie a string through this hole.…
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Inertia/Momentum

Rock and roll records that just won’t swing

An old record (or CD) demonstrates gyroscopic principles Gyroscopic inertia - a strange, complicated word - is a force common all around us. It explains how we are able to ride a bike, how planes navigate, and how a figure skater is able to do those lightening fast spins. Here's a simple experiment that'll clear up this confusing concept. Note: the hardest part of this experiment is going to be finding one of those old LP records. Tie one end of the string to the middle of a matchstick or pencil. Pull the other end of the string through the center of a LP record (so the matchstick is centered underneath the hole). Swing the record back and forth like a pendulum in smooth, even…
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