Banked Curves and Static Frictional Components

AI Thread Summary
The discussion centers on the mechanics of tire friction in banked curves. It clarifies that while the part of the tire in contact with the ground is relatively stationary, the friction acts in both tangential and vertical directions. When a car moves in a circle at constant speed, the tangential component of static friction is zero, as there is no acceleration in that direction. This understanding is crucial for calculating centripetal acceleration and friction forces in circular motion. The conversation emphasizes the importance of recognizing the different components of friction when analyzing vehicle dynamics.
Starwing123
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The part of the tire on the ground of a moving car is relatively stationary compared to the ground, right? The way the wheels work is the friction parallel to the direction of movement right? So when we calculate centripetal acceleration for cars going in a circle and the friction forces, why do we not have two components of friction?
 
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Starwing123 said:
The part of the tire on the ground of a moving car is relatively stationary compared to the ground, right? The way the wheels work is the friction parallel to the direction of movement right? So when we calculate centripetal acceleration for cars going in a circle and the friction forces, why do we not have two components of friction?

The blue sentence is not true. When the car travels along a circle, the friction can act against slipping both in tangential direction, along the circle, and also up or down along the slope, although the tangential component of static friction is zero when the car moves with uniform speed.

ehild
 
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Oh, Thanks! I didn't realize that the tangential friction is 0 b/c the car is moving at a constant speed.
 

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