- #1
YearnToLearn
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Homework Statement
Hey. I was doing some exam practice questions, but I hit a snag with this one and can't quite work out how to proceed.
A 6kg block at rest is pulled along a horizontal surface by force F→ at angle θ. Given that the coefficient of kinetic friction is 0.15, find the optimal angle at which to apply the force to achieve maximum acceleration.
Homework Equations
F = ma
fk = μkN
F→2 = F2sin2θ + F2cos2θ
The Attempt at a Solution
N = mg - Fsinθ
μk = 0.15/58.86
fk = (2.55×10-3)(mg-Fsinθ)
Fnetx = Fcosθ - fk
ax = (Fcosθ - fk)/m
From here I guess I need to form a differential equation and solve for maximum but this leads to θ being a ridiculous angle. Any advice? (P.S, sorry if this is in the wrong section, still trying to gauge the levels of physics being done in each)