# Coefficient of Kinetic Friction Question

#### wilson_chem90

1. If the acceleration of a pair of boxes has a magnitude of 2.5m/s^2, determine the smallest coefficient of friction between the boxes that will prevent slippage.

2. Homework Equations
F = ma
Fk = ukFn
Fw = mg

3. The Attempt at a Solution

ma = uk mg(Fn)
a = uk g
a/g = uk
2.5m/s^2 / 9.8m/s^2 = uk
uk = 0.25

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#### LowlyPion

Homework Helper
Since you don't want it to slip, it's really the coefficient of static friction you are interested in, but as to your solution, that looks like the right method.

#### wilson_chem90

oh okay, so its the same format just static friction?

#### LowlyPion

Homework Helper
oh okay, so its the same format just static friction?
Correct.

μs not μk

No big deal.

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