How to prove Galilean invariance

glapglipper

R will be a unitary matrix (all rotation matrices are). By definition a unitary matrix will preserve length (or magnitude) of your vector. So your proof is basically saying that if you are rotating your reference frame, your force is now going to be pointing in a new direction. That sounds right to me :).

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glapglipper	How to prove Galilean invariance R will be a unitary matrix (all rotation matrices are). By definition a unitary matrix will preserve length (or magnitude) of your vector. So your proof is basically saying that if you are rotating your reference frame, your force is now going to be pointing in a new direction. That sounds right to me :).