Posted by **anonymous** on Monday, February 15, 2010 at 11:00pm.

A 2.90 kg box is sliding across the horizontal floor of an elevator. The coefficient of kinetic friction between the box and the floor is 0.320. Determine the kinetic frictional force that acts on the box for each of the following cases

a)The elevator is stationary

b) The elevator is accelerating upward with an acceleration whose magnitude is 2.20 m/s2

(c) The elevator is accelerating downward with an acceleration whose magnitude is 2.20 m/s2

- Physics -
**drwls**, Monday, February 15, 2010 at 11:09pm
Multiply the coefficient of friction by the force applied to the box by the floor. This force equals M g for part (a). In the other cases you have to take into account the acceleration of the elevator, which changes the applied force.

- Physics -
**anonymous**, Monday, February 15, 2010 at 11:21pm
i'm sorry i'm confused what am i multiplying togethor and how do i solve for b and c

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