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In: Physics
Moving up or down.
Our concept of directions is rooted in a system involving the pull of gravity. We assign the direction where it originates as “down”, and the opposite direction “up”.
Fundamentally, up and down are meaningless without the presence of a constant force like gravity in a direction. If you really want to impress, look up the “greatest thought” that Albert Einstein said he ever had.
Vertical motion is a change in height. What counts as “height” depends entirely on context, but is typically used to describe an axis which is parallel to the force of gravity.
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