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)?


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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!
 

Thread 'Rolling without slipping on a curved surface'

Kindly see the attached pdf. My attempt to solve it, is in it. I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction. I'm not able to figure out, why my solution is wrong, if it is wrong .
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Thread 'Struggling to understand the concept of this question (ice cube in water optics question)'

TL;DR Summary: I came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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