Recent content by Nobelian

Yes the frame of reference (earth) is spinning all the time, but we are also spinning with it, so we are always in the same position relative to the frame of reference, and this is why we don't see any change, as an observer. The Earth is also rotating around the sun, but we are also rotating...

You are exerting a force (force normal) upwards, but there is no work done because the object has not traveled a distance. The energy of muscular contraction requires a constant change in tension of the muscle fibres, so while the object is not moving, your body is consistently doing work on the...