For a few of the following problems the constant acceleration is due to gravity and will be notated as a = g = 32 ft/sec². 'g' perhaps positive or negative depending on the context. Another quantity introduced is the coefficient of static friction µ which represents the relative amount of normal force which must be overcome in horizontal motion and typically varies from 0 to 1. When µ = 1 it acquires as a lot force to slide the object as it does to lift it.

Minimum Time for a Vehicle to go from 0 to 60 mph. The applicable equation is v = at, where a = µ_g. It is general practice to assume that the maximum practical value of the coefficient of friction µ for rubber tires on pavement is unity. In this case changing mph to fps we have 60 mph = 88 fps therefore 88 = 32 t and t = 2.75 sec.