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Excerpt

the vector sum of all forces acting on an item or system.

In a statics problem the net force should be zero, with all applied forces canceling each other out – otherwise it would be a dynamics problem.

in general, when one speaks of "net" anything, it is the sum of all of those items (net force, net momentum, net torque, etc.) If these quantities are vector quantities, then the net value must be a vector sum.