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37 votes
8 answers
11k views

What determines which frames are inertial frames?

I understand that you can (in principle) measure whether "free particles" (no forces) experience accelerations in order to tell whether a frame is inertial. But fundamentally, what determines which ...
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8 votes
4 answers
1k views

What is the difference between a translation and a Galilean transformation?

What is the difference between a translation and a Galilean transformation?
An Ignorant Wanderer's user avatar
1 vote
2 answers
1k views

What does a Galilean transformation actually mean?

What does a Galilean transformation actually mean? I'm having trouble defining the equation for displacement shifts $x'=x-vt$. Does it mean that to any event $C$ the displacement in the primed ...
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