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## Homework Statement

A loaded penguin sled weighing 75 N rests on a plane inclined at angle θ = 21° to the horizontal (see the figure). Between the sled and the plane, the coefficient of static friction is 0.30, and the coefficient of kinetic friction is 0.18.

**(a)**What is the minimum magnitude of the force

**F**, parallel to the plane, that will prevent the sled from slipping down the plane?

**(b)**What is the minimum magnitude

*F*that will start the sled moving up the plane?

**(c)**What value of

*F*is required to move the sled up the plane at constant velocity?

http://edugen.wileyplus.com/edugen/courses/crs7165/art/qb/qu/c06/fig06_29.gif

## Homework Equations

f

_{s}=μ

_{s}F

_{n}is the magnitude of the maximum static force.

f

_{k}=μ

_{k}F

_{n}is the kinetic friction force.

## The Attempt at a Solution

http://s1294.photobucket.com/user/jhoversten/media/20150626_193750_zpsvqv6akeu.jpg.html [Broken]

i can see why my attempt at solving a is not working. thanks[/B]

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