Question

net force is abbreviated as $vec{f}_{net}$ or $sumvec{f}$. it is the vector sum of forces acting on an object. to determine the $sumvec{f}$ acting on an object in one dimension, we forces acting in opposite directions and forces acting in the same direction.

Explanation:

Step1: Analyze forces in opposite - direction

Subtract forces acting in opposite directions.

Step2: Analyze forces in same - direction

Add forces acting in the same direction.

Answer:

Subtract; Add