| MadSci Network: Physics |
True, there is no such thing as an absolutely stationary
object, but this doesn't disprove Newton's first law ("an object
in rest stays at rest, and an object in motion stays in motion,
unless acted upon by an outside force"). It merely implies that
the first part of this law is irrelevant.
Actually, if you are moving alongside another object at the same
velocity, that object looks stationary to you, in your
frame of reference, so the first part of this law is indeed
applicable. The whole point of relativity is that whatever
frame of reference you're in, as long as it's an inertial
reference frame (going at a constant velocity), Newton's laws
will still work for you.
-Aaron
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