Ramp problem with friction

by sakebu
Tags: friction, ramp
 P: 6 1. The problem statement, all variables and given/known data μs = .300 Mass = 3.00kg Incline = 35° What is the minimum normal force applied to prevent the crate from sliding down the incline? 2. Relevant equations μs = Fk / n 3. The attempt at a solution The book solution is 32.1N but I have no idea how they got that.
HW Helper
P: 2,315
 Quote by sakebu 1. The problem statement, all variables and given/known data μs = .300 Mass = 3.00kg Incline = 35° What is the minimum normal force applied to prevent the crate from sliding down the incline? 2. Relevant equations μs = Fk / n 3. The attempt at a solution The book solution is 32.1N but I have no idea how they got that.
If this crate is left alone, it will slip down as friction is not big enough.

One way to stop it would be to apply an appropriate force parallel to the slope.

What is planned here is to apply a force perpendicular to the slope, which will increase the friction force so that it is strong enough to prevent motion.

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