Final answer:
The net force acting on a tissue box being pushed across a desk with a force of 5N in opposition to a frictional force of 2N is 3N.
Step-by-step explanation:
If you are pushing a tissue box across a desk with 5N of force and the force of friction is 2N, the net force acting on the tissue box would be the difference between these two forces. The net force is calculated by subtracting the force of friction from the pushing force:
Net Force = Pushing Force - Friction Force = 5N - 2N = 3N
Therefore, the net force acting on the tissue box is 3N.