Friction & Cars: Understand Acceleration, Constant Velocity & Brakes

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SUMMARY

This discussion focuses on the role of friction in car dynamics, specifically regarding acceleration, constant velocity, and braking. It clarifies that rolling friction is the type responsible for a car's acceleration as tires push against the road. When maintaining constant velocity, the net force is zero, indicating that frictional forces are balanced by other forces. Additionally, friction is essential for braking, as it provides the necessary resistance to slow down the vehicle. Proper tire inflation is also highlighted as a factor that influences fuel efficiency, primarily by reducing rolling resistance rather than increasing friction.

PREREQUISITES
  • Understanding of basic physics concepts such as force and motion
  • Knowledge of friction types, specifically rolling friction
  • Familiarity with the principles of vehicle dynamics
  • Awareness of tire maintenance and its impact on performance
NEXT STEPS
  • Research the physics of rolling friction and its impact on vehicle acceleration
  • Explore the concept of net force and equilibrium in constant velocity scenarios
  • Study the mechanics of braking systems and the role of friction in stopping a vehicle
  • Investigate the effects of tire pressure on rolling resistance and fuel efficiency
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Automotive engineers, physics students, driving instructors, and anyone interested in understanding the mechanics of vehicle performance and safety.

takando12
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I can understand that friction is responsible for the acceleration of a car. As the tires turn they push back on the road and the horizontal component of the contact force(ie friction) opposes the motion of the tires and push in the forward direction, making the car move.
1) Which type of friction are we talking about here?
Since we are talking about the tires, is it rolling friction that helps to accelerate the car?
2) Constant velocity
Suppose we are keeping the car going at a constant velocity. The net force should be zero. Does that mean the frictional force is balanced by something?
3) Brakes
My teacher told me friction plays a very important role int he working of breaks. I'm confused. Friction is supposed to keep the car accelerating , so how does it help in stopping it then?
4) Proper inflation of tires saves fuel:
I am unable to arrive at a reason for this. Again I am not sure if this is done to reduce friction or increase friction.
I keep thinking it has to increase friction as friction is what helps the car to move. But the whole thing is very counter intuitive.
I am really confused. Please do help me clear this up.
 
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