- #1
RoyG
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Homework Statement
"what is the maximum speed at which a car can safely travel if the radius of the track is 80.0 m and the coefficient of friction is .40"
friction is providing the force and the track is flat and circular.
Homework Equations
the equations that we've been using in class are:
Fnet=ma
a= V^2/r
w=mg
force of friction= (coefficient of friction)(normal force)
The Attempt at a Solution
I set up the Newton's Second Law for centripetal force (Fnet=ma) and know that the Fnet would be the coefficient times the normal force. I set up the acceleration equation (a=V^2/r). But I'm confused about finding the normal force without a mass. I know that velocity is distance divided by time and that the distance would be 2∏r, but I don't know how you would find it that way without time. What am I missing?