Watch A CD Ripped Apart By Rotational Force At 170, 000 Frames Per Second
What happens when you take a perfectly good CD and
spin it really, really fast? As you can see in the latest Slow Mo Guys
video, the entire structure pretty quickly explodes into hundreds of
tiny pieces. But if you think that's impressive, wait until you see the
whole process slowed down to 170,000 frames per second and, holy crap,
it really looks spectacular.
So
what's going on here? The team explain that once a CD spins over 23,000
rotations per minute, its stability is compromised and it starts to
fall apart. Very simply, that means that the rotational force at that
point is stronger than the force that's holding the CD together.
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Rhett Allain over at Wired has written up an amazingly detailed account of
the physics going on to create the beautiful shatter patterns (complete
with calculations), which you should definitely check out. But his summary?
"Before
the CD breaks, the rest of the CD exerts a force on the CD piece
causing it to move in a circular path. After the break, this force is no
longer there. What do objects without forces on them do? The correct
answer is that they don’t change their momentum (velocity would be
acceptable). Moving in a straight line means the object has constant
velocity."
While we don't recommend you try
this at home (even if you did have the right fancy equipment), it's
pretty spectacular to watch over and over again from behind the safety
of your screen.
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