Find the coefficient of friction between the car tires and the road.

  • #1
BlackCatXIII
4
0
help needed! ><

Someone please help me with this question!
(at least show me how to do it~!)

A car slams on its brakes and skids to a halt from 65km/h in 2.67s. Find the coefficient of friction between the car tires and the road.

Thanks in advance~! ^^
 

Answers and Replies

  • #2
HallsofIvy
Science Advisor
Homework Helper
43,021
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You know the change in speed in a given time (65km/h in 2.67s) so you can find the acceleration. IF you knew the mass of the car, then you could calculate the friction force from F= ma.
Since you are asked for the "coefficient of friction" rather than the friction force itself, you don't need the mass: The friction force is F= k*weight= kmg.

That is, F= ma= kmg so k= a/g- the mass cancels out.
 

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