The World's Least Bouncy Ball - YouTube

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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