A) You push against a box; it

doesn't move.

Is the net force of the box in this situation balanced and at zero?

Or is it unbalanced?

F = M A. Ican't type that big enough! = = > If the net force on the box is not zero, it would be accelerating.

==> If the box is not accelerating, the net force on it must be zero.

If there ARE any forces acting on it, they must be balanced, since they add up to zero.