- #1
Mafalda
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1. A crate resting on a rough horizontal floor is to be moved horizontally. The coefficient of static friction is 0.40. To start the crate moving with the least possible applied force, in what direction should the force be applied?
a. Horizontal
b. 24 degrees below horizontal
c. 22 degrees above the horizontal
d. 24 degrees above the horizontal
e. 66 degrees below the horizontal
Almost 1 hour on this and I really cannot find how to do it! This is the work I’ve done
Fx-fs = 0 <=> Fcosθ = µs . N
Fsenθ + N - W = 0 <=> N = W - Fsenθ
So:
Fcosθ = µs . (W - Fsenθ)
And then I can’t continue! I really need to understand! Thanks!
a. Horizontal
b. 24 degrees below horizontal
c. 22 degrees above the horizontal
d. 24 degrees above the horizontal
e. 66 degrees below the horizontal
Almost 1 hour on this and I really cannot find how to do it! This is the work I’ve done
Fx-fs = 0 <=> Fcosθ = µs . N
Fsenθ + N - W = 0 <=> N = W - Fsenθ
So:
Fcosθ = µs . (W - Fsenθ)
And then I can’t continue! I really need to understand! Thanks!