Kind: captions
Language: en
[Applause]
check this out I have a piece of PVC
electrical conduit and on one end I've
labeled an O and the other end I've
labeled an X now I'm going to put it on
the table and press down with my
forefinger on the o and I'm going to
give it a
[Applause]
spin do you see that you can only see
the O as it spins around let's make sure
that's not just a fluke I'll try it
again so putting my finger on the
o
and I see only O's well let's try
putting my finger on the X and see what
we see
then and we see only X's so why is that
why do you only see the label of the
side that you
press well I don't want to tell you the
answer right away you could Google it
but I don't think that would be very
satisfying so I think the best way would
be to go down to your local hardware
shop pick pick up a bit of a electrical
conduit and cut it into various
lengths now to help you out I have made
a shorter length of tubing with the same
markings on it so let's give that one a
try and see how it Compares so first
I'll press on the
o we see three O's when I do it like
that right but you don't see the X's
yeah but if you put your finger on the X
to start
with you see 3 X's that's interesting so
what's the deal
yeah what is the deal if you like send
me in a video response and I'll post it
below now if you're too lazy for any of
that I'll post the answer in a week so
you know subscribe and you'll find out
why this
happens so normally when I'm filming my
videos I have to approach people and ask
them to talk to me about physics but
while I was filming the spinning tube
trick uh a few kids came up to me and
wanted to see what I was doing and we
got to discussing how the trick works
and one of the kids suggested that I try
spinning the tube on a glass table now a
glass table is beyond the budget of
veritasium but a piece of glass resting
precariously on the backs of two chairs
that I think I can manage if this was
glass and you clicked on the X and we
were looking From Below you'd see the
you're hectic jar I reckon you'd still
see the X's I reckon you still I don't
know but I mean I reckon you still see
good question next video this is the
next video we need
to now instead of saving this for
another episode I thought I would do it
right now and that way you may have a
little bit more evidence to figure out
how the trick is working so I'm going to
place the tube on the glass surface and
I'm going to press down on the X and I
want you to make a prediction if we look
from the underside from underneath the
glass what will we see will we see an O
like the student thought will we see an
X like I said we would will we see both
the X and the o or will we see
neither so I want you to make a
prediction now click on one of the an
ations if you're watching on YouTube if
you're watching on a mobile device I'll
put the link in the description so
hopefully you can check that out let's
give it a shot so make your prediction
now 3 2