where C is a constant that describes the air resistance's dependence on the environment and the geometry of the crane, u is the friction coefficient, Fn is the normal force, P is the power of the crane's motor, m is the crane's mass and g is the gravitational acceleration. The illustration below illustrates these forces working on the mobile crane. In this image, the resistance forces, Fdrag and Ffriction, have been combined into Fresistance FN Fresistance Fdriving M F What is the friction coefficient u of the road the crane is driving on Cynracovoanewvere in terms​