hey everybody today I'm going to be showing you the world's least bouncy
bouncy ball made of poly Noire aborning now these balls may look very similar
they're both completely solid about the same density they weigh about the same
but this one's made of neoprene and this one's made of poly Noire borning so on
the macro scale they look about the same but on the molecular scale they're quite
different let me show you what they look like
so if you could zoom in on both of these balls you'd zoom in on the neoprene and
you'd find these long chains of carbons with a few chlorine atoms here but then
if you could zoom in on this poly noir borning here you do min and you'd find
also these long chains but you kind of have these house like structures of
carbons in here so you can imagine if you were to hit both of these molecules
you can imagine this top one it kind of looks more like a spring it could kind
of compress and then push back on you so it would be a little bit more elastic
but this poly nor borning here because of these five membered carbon rings here
as you push on it it would kind of restrict the movement but you're still
putting energy into it and so as opposed to compressing and then pushing back on
you what it does is just cause these molecules to vibrate a little faster and
twist and turn a little bit more and all that does is increase the temperature so
as you hit both of these this one pushes back on you and this one starts moving
faster and so what that means is this one rises in temperature and this one
doesn't change temperature that much and so one of them is bouncy one of them
doesn't bounce but increases in temperature and that's exactly what we
see when we drop these so let me show you what happens when we drop both of
these on a hard surface you'll see that this one bounces almost to the same
height and then this one just kind of plops on the ground and doesn't do
anything it absorbs almost all the shock and it goes into increase in the
internal temperature instead and then after we see what happens at room
temperature we'll see what happens if we actually increase the temperature of the
balls does the elasticity of both materials stay the same or change okay
now see if you can guess which one is the pollen or borning
which one is the neoprene okay three two one
this one just plops on the ground and nothing happens no movement whatsoever
okay let's try it again look at this three two one
it doesn't even bounce whatsoever just hits the ground and stops three two one
so watch if I throw them both down it almost is like this is some play ball
that you're throwing on the ground and just deforming and it has no elasticity
at all but what's weird about it is it's just as solid as the neoprene it's just
a solid ball it doesn't deform when you push on it
it just feels like a solid rubber ball but then this happens it's so weird
so we can see how differently these bounce at room temperature but now let's
see what happens if we warm both of these up so I'm gonna warm both of these
up to around a hundred see just put them in some boiling water for a bit and then
let's see what happens so now I have both balls soaking in here for about ten
minutes in a hundred degree water so while we're waiting for our balls to
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now now let's see what happens when you drop both of them together so this is
the neoprene one marked with our red dot here and here's our Pauline or borning
one okay now let's see what it looks like with them warmed up so this is our
neoprene 1 and this is our Pauline or borning 1 3 2 1 so you can see it
actually got some bounces in there so before we have 0 bounces and just by
heating it up around a hundred degrees now we can get about three bounces out
of it one two three four five and the neoprene stays bouncy as well so you can
see that when we heated the Pauline or boarding up what it did is it made these
bonds and these molecules a little bit more twistable so that when you push on
them they actually recoil a little bit so they it can recover some of that push
and push back on you so they can be somewhat elastic so the way I've
explained elasticity here like this neoprene in order to be elastic it needs
to be able to recover all the energy that went into it and push it back out
in a recoil so the Pauline or borning can absorb all impact to it whereas the
neoprene just pushes it back so that means for something to be purely elastic
it needs to be able to not increase in internal temperature at all and all of
the energy that went into it goes into a recoil and pushes it back out and that
leads me to an interesting point what do you think is actually more elastic
between an elastic band and a steel ball well a steel ball is actually more
elastic so even though it's very rigid and stiff it's actually elastic because
it stores the energy of impact in its bonds and then releases them in a recoil
so steel balls are actually pretty bouncy there are actually more bouncy
than rubber balls but you can only really see the true elasticity of steel
balls if you bounce them on something that's harder than a steel ball itself
because if you don't put them on something that's harder than steel then
it will just deform the thing that it hits and so that thing absorbs the
energy and so it doesn't go back into making
the ball bounce whereas for a rubber ball it's very soft so it won't deform
the thing that it's hitting for example if I try to bounce a rubber ball and a
steel ball on this paper you can see that the rubber ball appears to bounce
much more than the steel ball but if you put them on harder surfaces then you can
see the elasticity of the steel ball better
so bouncing both of them on this harder surface here you can see how much the
steel ball actually bounces now now the best result you can get from the steel
ball is actually bouncing it on still in that case you can get almost perfect
elasticity out of it and it just keeps bouncing back and forth that's why they
make things like Newton's cradles out of steel balls as opposed to rubber balls
because steel balls are more elastic than rubber and thanks again for
watching another episode of the action lab I hope you liked it if you have any
comments or questions let me know in the comments section and head over to the
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