Friction on an Inclined Plane: Kinetic or Static?

AI Thread Summary
Kinetic friction acts on a car traveling downhill if the tires are slipping against the surface, while static friction applies if the tires roll without slipping. The distinction hinges on whether there is relative motion between the tires and the ground. If the wheels are in motion but maintain contact without slipping, static friction is at play. Understanding this concept is crucial for solving problems related to friction on inclined planes. The discussion clarifies the conditions under which each type of friction operates.
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Homework Statement


Does kinetic friction and static friction act upon a car traveling downhill (without acceleration by the car)?


Homework Equations





The Attempt at a Solution


Is it kinetic because the wheels rub against the surface and the car is in motion? But is it also static because the wheels are rolling downhill and at each point in time the wheels are stationary in their contact with the ground?
 
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It's one or the other, but not both. If the tires slip against the surface, it's kinetic friction; if the tires roll without slipping, it will be static friction.
 
Thanks, that helped a lot!
 

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