45. ssm A 6.00-kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.360. Determine the kinetic frictional force that acts on the box when the elevator is (a) stationary, (b) accelerating upward with an acceleration whose magnitude is 1.20 m/s2, and (c) accelerating downward with an acceleration whose magnitude is 1.20 m/s2.

Sum of the forces vertically provide

So N is

 

Kinetic Friction force is

 

Elevator stationary, ay = 0

 

Elevator moving up with ay = +1.20 m/s2

 

 

Elevator moving down with ay = -1.20 m/s2

 

 

 

 

 

 

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This page last updated on January 11, 2020