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CEFR 等级
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hey everyone it's me Derek from the
channel veritasium and I've been
following this series by Destin on
smarter every day about helicopters and
gyroscopic procession is just one of
those things that still blows my mind as
it did Destin so I'm here at the
University of Sydney my old stomping
grounds I'm going to borrow some of
their lecture Dem equipment to hopefully
teach you a bit about how gyroscopic
procession
works the first thing I need to do is
talk about vectors because a lot of
things in physics are vectors that means
they have Direction so an example would
be momentum and force those are two
examples of some pretty common vectors
so if I have a cart moving along here it
has some momentum in that direction and
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