Kind: captions
Language: en
All right, here is the setup. I have a
rifle mounted vertically, and we're
going to shoot a bullet into this block,
right into the middle of it. And so,
obviously, the block is going to go
flying into the air. But we're going to
do this again, and instead of firing the
bullet right into the middle of the
block, we're going to shoot it off to
one side. And I want you to make a
prediction. Will that spinning block
when we hit it to one side, will it go
the same height as this first block,
will it go not as high or will it go
higher?
Okay. So, versus being shot in the
middle when you shoot on the side is the
question, right? Like,
yeah. How high will it go in comparison?
It depends on if the bullet stays in the
block. And I'm assuming it does.
It does stay in the block. Yeah, I'll
guarantee that.
Same height.
I'm purely basing it on just like an
instinct that I have.
I feel like I'm being tricked. I just
feel like you're trying to trick us and
that it's going to do something that we
can't predict.
I thought the obvious answer is not as
high. So, I'm going to say higher.
[laughter]
I'll say higher.
Finally off the camera,
but but it's going to like fly in a
different direction or [clears throat]
something.
So, you have angular momentum, which is
L, and you have translational momentum,
which is P.
Yeah.
When you hit it in the middle of the
block, the block doesn't really spin at
all. So, it just goes up to certain
height. But when you hit it on the side
of the block, it's going to be spinning.
So, it's going to have imparted some
kinetic energy. So there won't be as
much potential energy
and so the total energy of the system
basically has to stay constant and the
kinetic plus potential which would be
the height it goes to will have to be
constant. So if it's spinning and has
kinetic energy it can't go as high.
That's my prediction.
So my prediction is it'll go up not as
high but it'll spin more if it's hit to
the side. Am I wrong?
I want you to think which do you think
is the most reasonable and then click
one of the annotations above. All right.
Are you ready? Make your prediction in
three, two, one.