1. The problem statement, all variables and given/known data 2. Relevant equations I believe: F = m . a Ffriction = μs . N Ffriction = μs . mg . cosθ 3. The attempt at a solution I don't quite get how the equations above would give me an answer to the minimum friction required so that the farmer doesn't slip. I know Fl = (70x9.81)cos(40) = 526N But there is now a variable Ffriction that I don't know how to find... I'm terrible at physics. If someone could explain or give me a head start, it would be appreciated.