If the sled is on the verge of slipping down the slope, then the friction is pointing up the slope?
Should I not do that? What should I do instead?
Thank you for responding, sorry I couldn't not respond immediately.
[b]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...