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Please help with a SIMPLE physics question involving friction!?

Please help with a SIMPLE physics question involving friction!? - Physics Forum

Please help with a SIMPLE physics question involving friction!? - Physics Forum. Discuss and ask physics questions, kinematics and other physics problems.


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Old 06-24-2009, 01:20 AM
Pipette Filler
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Default Please help with a SIMPLE physics question involving friction!?



A car is traveling at 52.0 mi/h (23.25 m/s) on a horizontal highway.

(a) If the coefficient of static friction between road and tires on a rainy day is 0.098, what is the minimum distance in which the car will stop?
( in m)

(b) What is the stopping distance when the surface is dry and Ás = 0.600?
(in m)

I've been working on this problem for a long time and can't seem to get anywhere without knowing the mass of the car.. which isn't given... can someone please help me?

Any help is greatly appreciated!

I know f=uN and that you can do sum of forces in x direction and then sum of forces in y direction but I can't figure out how to combine these equations to get the answer...
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