Question:
My name is Kevin Cheng. I would like to know if there is
friction in space.
Replies:
There's no air, so there's no friction from air, no resistance to
moving around freely. However, other kinds of friction still exist,
like when two things slide against each other, although if you are in
orbit or otherwise feel no acceleration (no gravity) then these things
have no weight and don't press against each other like sliding a box
across a floor here on Earth. Mechanical devices such as motors and
pumps still experience their usual internal friction. (There's no
perpetual motion, even without gravity.)
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