How to find coefficient of friction?

  • #1
If a driver traveling down an 8% grade hill slams down the brakes of his car and skids 30 meters, what is the coefficient of friction ( assuming he was traveling at 25 MPH or more)?

Appreciate your help asap.
 

Answers and Replies

  • #2
73
0
you use the acceleration due to gravity and say that the friction overcomes that by ___ amount
 
Last edited:
  • #3
What is 8% gradient in degrees?
 
  • #4
is Coefficient of friction tan(slope in degrees) ?
 
  • #5
73
0
i believe that 8% is the tangent of the angle. the coefficient of friction is mu, and for most cars should be between .6 and .8
 
  • #6
Doc Al
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If a driver traveling down an 8% grade hill slams down the brakes of his car and skids 30 meters, what is the coefficient of friction ( assuming he was traveling at 25 MPH or more)?

Appreciate your help asap.
Assemble the usual suspects: Draw a diagram showing all the forces acting on the car. Apply Newton's 2nd law to relate the net force to the acceleration. Use kinematics or work/energy to compute the acceleration. (Pick a specific speed: convert 25 mph to m/s.)
 

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