A 60.0kg crate rests on a level floor in an elevator. The coefficients of static

Question

A 60.0kg 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 1.20m/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 a constant speed? A 60.0kg 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 1.20m/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 a constant speed?

Explanation / Answer

when the elevator is accelerates then the normal reaction is changes. (a)    if the elevator is accelerates upwards with an acceleration 1.20 m/s^2, then the normal reaction R = m(g+a)             R = 60(9.8+1.20)             R = 660 N the frictional force F =

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