Determining distance of travel with friction acting on a car.

AI Thread Summary
A car traveling at 51 mi/h on a wet highway with a static friction coefficient of 0.102 needs to determine the minimum stopping distance. The discussion highlights the use of kinetic equations and the relationship between friction and motion. Participants express confusion over the lack of mass and acceleration values in the problem, complicating the calculation of stopping distance. A free body diagram is mentioned, noting that it becomes more useful once the mass is recognized as canceling out in the equations. Ultimately, understanding the forces involved, including weight, normal force, and friction, is crucial for solving the problem.
quinntan
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1. A car is traveling at 51 mi/h on a horizontal highway. If the coefficient of static friction between the road and tires on a rainy day is .102 what is the minimum distance in which the car will stop.



2. f=un f=ma kinetics equations



3. No idea here. Teacher barely skimmed over friction so far and all problems we have done in class either had a value of acceleration, a mass or a force. This one has none of those.
 
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can u imagine what will happen to the car?
 
I know it will stop eventually but I don't know how far it will go. I made a free body diagram but it wasn't very useful without knowing the cars mass.
 
quinntan said:
I know it will stop eventually but I don't know how far it will go. I made a free body diagram but it wasn't very useful without knowing the cars mass.

In your free body diagram, do u have these 3 forces:

the weight od the car, the normal force exerted by the ground, and the friction force? :)
 
Alright I got it. It turns out that the masses cancel.
 
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