If the force to slide one box on the floor is 10 pounds and you stack two other boxes of the same weight on top, what force is needed to slide them
10 pounds, because friction is independent of weight
20 pounds, because you added two boxes
30 pounds, because friction is proportional to weight
A ______________ is the sum of all of the other forces from different directions acting on the object.
Vector force
Resultant force
Frictional force
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