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학습 통계
CEFR 레벨
난이도
자막 (126 세그먼트)
[Applause]
Five fun physics phenomena. Number one,
have a friend hold a cane out
horizontally for you or another similar
object and putting your two index
fingers together, try to place them
underneath the center of mass. When they
let go, you will find it doesn't
normally work. But now try putting each
index finger at opposite ends of the
cane and then moving your index fingers
in towards the middle. What you will
find is that they always end up right
under the center of mass of the cane.
You can try starting off asymmetrically
and they will still end up under the
center of mass. You can try going at
different speeds, really slowly
or really fast.
But you still end up perfectly under the
center of mass.
How does this work? Number two, the
phone flip. Have you ever tried to spin
your phone? If you do it in this
direction, it's pretty easy. It stays
nicely aligned. If you spin it along its
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