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Ramp problem with friction

by sakebu
Tags: friction, ramp
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sakebu
#1
Oct20-11, 04:23 PM
P: 7
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.
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PeterO
#2
Oct20-11, 06:11 PM
HW Helper
P: 2,316
Quote Quote by sakebu View Post
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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