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Newton’s Third Law says
FAonB =-FBonA
A “Third Law Force Pair”
pair of forces that obeys Newton’s third law.
Two forces in a third law force pair
never act on the same object.
Internal Forces
do not influence the motion of a system’s center of mass.
Ideal String
has negligible mass, does not stretch when under tension, Experiences an equal force everywhere on the string
In a string with non negligible mass
tension may not be the same at all points within the string