![]() If the system did not experience a net external force the system was said to be isolated resulting in the total momentum of the system being conserved ( ∑p initial = ∑p final). When doing that it was necessary to determine if the system experienced a net external force that would cause a change in momentum. v) was used to analyze objects in motion.In both cases then the answer to the original question (How would you determine the Kinetic Energy for an object that is rotating and translating?) is V cm relative to Point A in this case is the same as the previous horizontal center of mass speed, v, relative to the horizontal surface. The total Kinetic Energy would be rotational only as the ring is rotating around point A at this instant and not translating (the point of contact on the ring is not moving relative to Point A on the horizontal surface). In this case, since the axis of rotation is not through the center of mass, Point O, the parallel axis thereom is used to determine I A. This will result in the rotational speed, ω, around Point A as depicted by the red arrow. ![]()
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