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F=MA F=MA in the PC release of Mario's Time Machine
SNES (left) and PC (right)
First appearance Mario's Time Machine (1993)

F=MA, also called Newton's Second Law of Motion, is an item in the SNES and PC versions of Mario's Time Machine. It is a sheet of paper with Isaac Newton's second law of motion written on it. Mario receives F=MA from one of the Royal Society members and gave it to another who was giving a lecture on the three laws of motion and could not remember the second one. In exchange, the lecturer tells Mario more about Newton and his three laws, information Mario eventually used to return Newton's apple to him.