1. A loaded penguin sled weighing 70 N rests on a plane inclined at 20° to the horizontal. Between the sled and the plane the coefficient of static friction is 0.25, and the coefficient of kinetic friction is 0.16. (a) What is the minimum magnitude of the force F, parallel to the plane, that will prevent the sled from slipping down the plane? 3. I cannot figure out what I'm doing wrong. I draw my free body diagram, write out an x/y chart, and then solve. I write a lot, so I'm just post an imgur link with my work in it. http://imgur.com/pCNNQ Can anyone show me what I'm doing wrong?