Tuning Forks

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Tuning Forks
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The tuning fork makes a simple wave.
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This is a simple sound wave made by striking a
tuning fork against a hard rubber shoe.
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Vibrations at the tip of the fork move the
particles of matter around the fork.
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QUESTIONS
How do you know the tuning fork is
vibrating? How do you know these vibrations will
make particles of matter move?
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First lets THINK!
When the tuning fork vibrates, we hear a sound
and we can see the tips of the fork moving.
Particles of matter are moving and we hear a
sound.
BUT how can we see the matter moving???
HUM
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What if we do an experiment that shows particles
of matter moving?
What would happen to a cup full of water when we
put a tuning fork into it?
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If the cup of water is full, then putting a
vibrating tuning fork into it will make the water
splash out.
AND
We will show that the vibrating tuning fork moves
particles of matter!
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Materials for our experiment...
Tuning Fork
CupofWater
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HUM...
What will we hit the tuning fork against to get
it to vibrate?
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A Hockey Puck will work!
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First lets test what will happen to the water in
the cup when we Do not hit the tuning fork
against the hockey puck!
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Remember the tuning fork was NOT hit against
the hockey puck.
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What did we see when we did not hit the tuning
fork against the hockey puck?
The water moved a little, but did not splash out
of the cup.
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Next, lets test what will happen to the water in
the cup when we HIT the tuning fork against the
hockey puck!
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Watch what happens to the water when BOTH TIPS of
the tuning fork are put in the water!
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Lets see that
AGAIN !
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When the vibrating tuning fork touches the
water, it splashes out of the cup!
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Did the particles of matter move when the
vibrating tuning fork went into the cup of water?
See the water drops!
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Even the paper is wet!
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QUESTIONS
How do you know the tuning fork is
vibrating? How do you know these vibrations will
make particles of matter move?