Kind: captions
Language: en
[Applause]
here is the setup I have a balance and
two identical beakers which I fill with
exactly the same amount of water except
in one of the beakers there's a
submerged pingpong ball Tethered to the
base of the beaker and in the other
there's an identically sized Ball but
made of acrylic so it's denser than
water and it's supported by a thread now
I want you to make a prediction if I
were to release this balance and allow
it to rotate freely which way do you
think it would tip towards the acrylic
ball towards the pingpong ball or would
it remain perfectly balanced you can
make your selection by clicking on one
of the onscreen annotations or clicking
a link in the description if they're
both displacing the same amount like I
think it won't rotate
so yes it will not rotate stay balanced
the ping-pong P does have mass albe it
not very much I would uh predict that
this end will will sink I almost feel
like this end would lift because it's
lighter than but it wouldn't be pulling
cuz it's Tethered to the lever I don't
know I'm thinking it would go this way
I'm thinking because of the tension
that's pulling this up so I guess if
you're summing the forces this one is
more so then this is going to rise no
all right so just switch my mind I want
to go with this one's going to rise but
I mean it seems like this shouldn't be
contributing any Force to this side
because it's suspended and the forces
are balanced that means you'd have more
of a normal force on this side side and
it would tip that way it'll tip down on
the ping pong ball side pong ball side
yeah that is so weird so now you think
it's going to go up on this side til
down on this
[Music]
side are you ready in three 2 1
[Music]
pap