Friction guiding a car around a curve

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SUMMARY

Friction is essential for a car's circular motion around a curve, primarily through static friction rather than kinetic friction. The free body diagram illustrates that the friction force acts opposite to the car's motion, but it does not serve as the centripetal force. Instead, static friction adjusts to prevent slipping between the tires and the road surface, depending on the car's actions, such as braking or accelerating. Understanding these dynamics is crucial for analyzing vehicle behavior in curved motion.

PREREQUISITES
  • Understanding of static and kinetic friction
  • Knowledge of free body diagrams
  • Basic principles of circular motion
  • Familiarity with the coefficient of static friction
NEXT STEPS
  • Study the principles of static friction and its role in vehicle dynamics
  • Learn how to draw and interpret free body diagrams in physics
  • Research the effects of tire-road interaction on vehicle stability
  • Explore the mathematical modeling of centripetal force in curved motion
USEFUL FOR

Automotive engineers, physics students, driving instructors, and anyone interested in understanding vehicle dynamics and frictional forces in curved motion.

ahmed emad
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friction is causes the circular motion in the car around a curve, and if we draw free body diagram we will see the friction force must be opposite the car motion so the force of friction not toward to the center of the curve ,so the force of friction must be not the centripetal force ,mustn't it?
 
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ahmed emad said:
friction is causes the circular motion in the car around a curve, and if we draw free body diagram we will see the friction force must be opposite the car motion so the force of friction not toward to the center of the curve ,so the force of friction must be not the centripetal force ,mustn't it?
Kinetic friction opposes the relative motion between two surfaces that are in contact and are slipping against each other.

The thing that is in contact with the road is the contact patch on the bottom of the car's tires. That contact patch is not (usually) slipping relative to the road. So you have static friction, not kinetic friction. Static friction provides whatever force is required to keep the surfaces from slipping (within the limits of the coefficient of static friction). The static frictional force will not necessarily oppose the motion of the car.

If you slam on the brakes, friction from road on tires will point rearward.
If you step on the gas, friction from road on tires will point forward.
If you steer right, friction from road on tires will point rightward.
 

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