# Question ff252

Sep 13, 2017

 μ = 0.40

#### Explanation:

The question states that a force of 3.9 N is required to push the block along at constant velocity. Being at constant velocity means that there is no resultant force on the block so the friction force must be equal to the 3.9 N pushing force.

Equation for friction:
F= μN
And $N = w$

So now we can find the friction coefficient, μ:
F = μN = μw ⇒ μ = F/w = 3.9 / 9.7 = 0.40#