I'm sorry, I have no idea how to attempt this question.

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In summary, friction is needed as the centripetal force to keep a car traveling safely around a circular flat racetrack. The maximum speed at which this can be done on a track with a radius of 80m is dependent on the coefficient of friction between the tires and the road, which is 0.3. The centrifugal force must equal the friction force, which can be found by using the equations for centripetal and friction forces. The mass of the car is not needed to calculate this solution.
  • #1
saikamaniac
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Friction provides the centripetal force necessary for a car to reval around a circular flat racetrack. What ios the maximum speed at which a car can travel safely around a track of radius 80m if the coefficient of friction between the tyres and road is 0.3?

I really have no idea how to attempt this question...
 
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  • #2
Do you know how to calculate the "centrifugal force" on the car? The friction force, equal to 0.3 times the weight of the car, must be equal to that.
 
  • #3
well the centrifugal force is just equal but opposite to the centripetal force
which i don't know...and i don't know the MASS of the car and thus can't calculate the weight
 
  • #4
A common thing for people who are just starting physics is to forget that, often times, mass is irrelevant to finding a solution.

The centrifugal forces must equal friction, correct? What do you do when two equations equal each other?

Whenever I get stuck, I like to just starting writing off my known equations:

[tex]\Sigma F_c = m\frac{v^2_t}{r}[/tex]

[tex]F_f = \mu m g[/tex]
 

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