A box with mass M is dragged across a level floor having a coefficient of kinetic friction (greek mu)k by a rope that is pulled upward at an angle Theta above the horizontal with a force of magnitude F.(adsbygoogle = window.adsbygoogle || []).push({});

What is the expression of the mag. of force needed to move the box with a constant speed?

I dont' really know what to do on this. What I've tried so far is spliting the angle's force into acos(theta) and asin(theta), then somehow applying friction. Does anyone know where I can read up on friction, maybe I just dont' understand the concept fully.

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# Homework Help: Kinetic friction, dragging a box

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