Homework Help: Incline and Firction (again!)

1. Sep 11, 2008

vysis

1. The problem statement, all variables and given/known data

A skier on a slope inclined at 4.7 degrees from the horizontal starts down the slope with an initial speed of 2.7m/s. The coefficient of friction is 0.11. Determine how far the skier will slide before coming to a rest.

2. Relevant equations

Fnet=ma
F(f) = (mu)N

3. The attempt at a solution
Completely lost =(

2. Sep 11, 2008

LowlyPion

What is the component of gravitational force on the skier that would induce the skier to continue down hill? What is the retarding force?. Using that find the rate of deceleration. That might be a good place to start then.

3. Sep 11, 2008

vysis

thats the thing though... it doesn't give you the mass. It ONLY gives you the force of kinetic friction and the initial speed

4. Sep 11, 2008

vysis

Solved, thanks guys

5. Sep 11, 2008

LowlyPion

Don't despair. Work things through. The mass may not matter.

When you develop the equation for the net force the mass part drops out to give you the net retarding deceleration.

You use that with the distance relationship that is v2/2a

Edit: Congrats then. Good Luck.