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## Main Question or Discussion Point

Assume we have two coordinate frames ##Oxyz, O'x'y'z'## the first one is fixed and the second one somehow moves, perhaps rotates. Then velocity of a point relative ##Oxyz## is

##\boldsymbol v=\boldsymbol v_r+\boldsymbol v_e,## where ##\boldsymbol v_r## is point's velocity relative ##O'x'y'z'.## The question is: how is referred to as the velocity ##\boldsymbol v_e##?

Thank you

##\boldsymbol v=\boldsymbol v_r+\boldsymbol v_e,## where ##\boldsymbol v_r## is point's velocity relative ##O'x'y'z'.## The question is: how is referred to as the velocity ##\boldsymbol v_e##?

Thank you