1. The problem statement, all variables and given/known data You are dragging a 110 kg trunk across a floor at a constant velocity with horizontal force of 380 N. A friend decides to help by pulling on the trunk with a force of 150 N [up]. Will this help? Calculate the force required to pull the trunk at a constant velocity to help you decide. 2. Relevant equations μk = Fk/FN Fg = m × g 3. The attempt at a solution I found the coefficient of kinetic friction (μk) to be 0.35. I'm confused by what it means by "will this help?". Wouldn't it help because your friend is reducing the FN (force normal) on the trunk? I found force required to pull the trunk at a constant velocity is 377.3 N (Fk) using the equation: μk = Fk/FN = 0.35 x 1078 N = 377.3 N. Now, when your friend is pulling the trunk upwards wouldn't the Force normal decrease to 928 N [up] because 1078 N - 150 N? So would the force required be Fk/ FN = 324.8N?