# Coefficient friction

1. Nov 8, 2005

### idontspeakmath

if you are given the coefficient of friction, initial velocity, and asked for the distance traveled, how would you do it? my first instinct is to use the vf^2=vi^2+2a(xf-xi), but i don't think that coefficient of friction is hanging out there for no reason?

2. Nov 8, 2005

### Tide

You're right - it's not hanging out there for no reason!

What, exactly, is the quantity a you wrote in your equation?

3. Nov 8, 2005

### idontspeakmath

i was assuming a=9.8, but i guess that was bad physics.
i'm tempted to relate this to f=ma, but there's no mass!

man, the last chapter has twice as many equations as the previous chapters combined. :(

4. Nov 8, 2005

### Tide

Presumably, somewhere in that chapter, there was discussion of the force of friction. Does this ring a bell? $F_f = \mu F_n$, i.e. the frictional force is proportional to the normal force. Can you guess what the proportionality constant is? :)