# Need help find μ (Coefficient of Friction)!

1. Sep 15, 2008

### Sewoon

Im designing a lab, in which i need to find the kinetic μ for a specific surface by sliding 6 different masses from the top, and taking the time it takes to reach the bottom. This surface is 30 degrees from the floor, making it a ramp. I will know the distance the masses cover.

Some relevant equations are -
F=ma
Ff=Nμ
Fr=F-Ff
d=vi(t)+(at^2)/2
v=d/t

What i did was to, drop the 6 masses from the top and take the time it takes to get to the bottom. From there u can find the v and acceleration. According to me, with acceleration you can find the Force of friction since you know the normal....I'm not sure if this is correct. If wrong, what do i need to find the μ of a surface in an experiment.
Thanks