Bank Curve Friction: How Does it Act?

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Bank curve friction acts as an additional centripetal force, but a well-designed banked curve can function without relying on friction, using only the normal force. There is confusion about the direction of friction; while it seems it should act outward, it actually assists in directing the vehicle toward the center of the curve. In unbanked curves, friction is essential for turning, as it prevents the vehicle from continuing straight. A free body diagram (FBD) indicates that friction acts inward, aligning with the centripetal force. The discussion highlights the complexity of understanding banked curves and friction in physics.
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How does Bank Curve Friction act on the object?
 
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The friction provides additional centripetal force, but a properly engineered banked curve does not rely on friction at all, only the normal force.
 
K I know that but I don't see how that can work... why would fricition act in the direction of the centripetal force? the object wants to go to the center, if friction is considered shouldn't it be in the opposite direction?
 
Consider an unbanked curve. Without friction, you wouldn't be able to turn your car to make the curve. The car "wants" to keep going straight. It's friction that pushes the car toward the center.
 
My teacher says that Ff is acting inward. Like you said.

But I did a FBD.

For non-friciton mg=Fn*cosx. But the if there is Ff there is a downwards components. So that's not really possible is it?

Can you send me a link?? I checked 4 book and non of them has bankcurved with friction problem. I'm probability wrong but science is the doubt of experts right? :smile:
 
NVM! I think I found a link
 

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