I apologize, SUM is the sum of all the forces, and Fun is the unbalanced force, in this case it would be force of friction (Ff) and something else. Also Fn is the normal force, and Fg is the force of gravity, and Fa would be an applied force.
My free body diagram includes the box with the...
Homework Statement
A jet-powered flatbed truck has a crate of mass m, which is strapped down to the truck with a tension three times the weight of the box. Find the maximum acceleration without having the box slide. Us= .9, Uk=.7
Homework Equations
Fun= SUM
Fun= ma
Ff= -(Us) Fn...