have you ever wanted to move an object with sound
yeah me too welcome to impossible science
hey guys it's jason latimer the world champion of magic now what you just saw
with the tuning fork and everything vibrating around
that was a total illusion makes for a great party gag but that doesn't mean
it's impossible in fact today i'm gonna show you how to
actually move an object without touching it and it uses
resonance okay today your challenge is to move that straw but you're not
allowed to blow on it you're not allowed to touch it and you're definitely not
allowed to kick the table over but since we know today's about resonance if we
were to create a sound wave that matches an
object's natural frequency that object would start to move without touching it
let's give it a shot
i'm not just totally joking by the way maybe if i practice the rest of my life
i could get the right pitch but there's a much faster way
so how does it work obviously it's a magical straw
just kidding it's science let's talk about resonance when we strike an object
it vibrates at its natural frequency if we were to create a sound that
matches an object's natural frequency that object will start to vibrate this
is what's called resonance as we run our finger around
the rim of a wine glass the friction between our finger and the glass
causes the glass to vibrate if we look closely at that vibrating
glass we will see that the two opposite sides are expanding and contracting
at the same time while the sides 90 degrees of those are doing the exact
same movements just in an opposite pattern these rapid
vibrations in glass cause the air inside to compress and
expand in waves these waves of air pressure create what
we know as sound your glass is actually sending sound
waves to the other glass and if we get it close to the other
glasses natural frequency it will begin to vibrate through
resonance this vibration in the glass is what's causing the straw to animate and
ultimately fall over super power how about super science okay
so the secret behind this is to find an object's natural frequency
but even though these glasses look the same
they sound different
that's because imperfections in the glass differences in densities and the
mold they're not exactly the same so what i'd
like to do is find the one with the lowest tone
and we're going to add water to the opposite one because as you add water
you can actually change the pitch of the tone coming out of this glass
still lower the more water the lower the pitch
if you're curious about actually how to even make a glass sing you need to wet
your finger and rub it along the rim the water
level tells you the pitch but the pressure tells you the volume
now wine glasses work the best for this as far as resonance and
emitting sound you can do it with other glasses but the thicker the glass the
harder it is to get it to vibrate let's give it a little bit more water
so all you have to do is give it a shot now if you're close it will start to
vibrate a little if you're dead on it'll vibrate a lot
and there you have it how to move an object with resonance
well that's it for today i hope you enjoyed making an object animate without
touching it and if you enjoyed making the impossible
possible let me know by clicking the like button and subscribing to the
channel and if you subscribe make sure you turn
on those notifications so that you'll know the next time i break something in
my house until next time stay curious because the
right question changes everything
you