Determining distance of travel with friction acting on a car.

[quinntan]

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.

 

[indr0008]

can u imagine what will happen to the car?

 

[quinntan]

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.

 

[indr0008]

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? :)

 

[quinntan]

Alright I got it. It turns out that the masses cancel.