A 60.0 kg crate rests on a level floor in an elevator. The coefficients of static and kinetic friction are 0.760 and 0.410, respectively. The elevator is accelerating upward at 1.20 m/s2. a) How large is the horizontal force which must be applied to the box to just start it moving? b) How large is the horizontal force which must be applied to the box to keep it moving across the floor of the elevator at constant speed?

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows: