When you press braking pedal -- wheel road surface tangent F

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SUMMARY

The discussion centers on the dynamics of a car's braking system, specifically at a speed of 100 miles per hour. When the brake pedal is pressed, the car decelerates smoothly without wheel sliding, indicating that the tangent force acting on the road surface is indeed related to the deceleration rate (dv/dt). The conversation also explores the implications of frictionless wheels, questioning whether a car could move on level ground without any tangent force acting. A free body diagram is requested to illustrate these concepts.

PREREQUISITES
  • Understanding of basic physics concepts such as force, friction, and motion.
  • Familiarity with Newton's laws of motion.
  • Knowledge of free body diagrams and their applications in mechanics.
  • Basic comprehension of vehicle dynamics and braking systems.
NEXT STEPS
  • Research the principles of friction and its role in vehicle braking.
  • Study Newton's second law of motion and its application in deceleration scenarios.
  • Learn how to create and interpret free body diagrams in mechanical contexts.
  • Explore the effects of different surface materials on tire traction and braking efficiency.
USEFUL FOR

Automotive engineers, physics students, and anyone interested in vehicle dynamics and braking mechanics will benefit from this discussion.

Gunmo
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- You are driving car with 100 mile/hour

- You are pressing brake pedal.

- The speed of car is suddenly gone down. Decelerated.

- However, Wheel is rolling on road without sliding and car stopped smoothly finally.In this case,

- the tangent force acting on road surface is related with deceleration rate dv/dt ?

- or as long as there is no sliding of wheel, tangent force is not relevant.

- Please do not count detailed contact mechanic.
 

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Can you draw a free body diagram of the situation? Could a car ever move (on level ground) if no tangent force could act? ie if the wheels were frictionless?
 

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