1. The problem statement, all variables and given/known data A 40kg person is falling at the speed of gravity, 9.8m/s^2. Wind resistance is not considered. On your free-body diagram, the direction they are falling (ground) is in the negative direction, hence gravity is causing an acceleration in the negative. 2. Relevant equations F(gravity) = (40)(-9.8) F(gravity) = -392N 3. The attempt at a solution I am simply curious when solving a problem such as this, would N be a -392N since it is traveling in the negative on the free-body diagram, or is it seen a magnitude and considered a positive number?