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Sir Isaac Newton led the foundation of his famous laws of motion during the 17th Century but at that time SI system hadn't existed. So in which units did he define force? Did he define it in some other units or was later redefined by scientists who made the SI system?

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The definitions related to Newton's laws of motion do not require the use of any units. The concepts of force, velocity, distance and time are expressed in general terms. Units are unnecessary.

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  • $\begingroup$ And for that reason, all relations are stated as proportions instead of equalities. $\endgroup$ Aug 23 at 12:18

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