Newton's Third Law Tire on Road Question

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SUMMARY

The discussion centers on the application of Newton's Third Law in the context of a car tire on a road surface. It highlights that as a car accelerates in the negative x direction, the tire exerts a downward force on the road, while the road exerts an equal and opposite force upward. The conversation also addresses the concept of horizontal force application, questioning how a car can exert force on the road when moving horizontally. The example of a car on an icy surface illustrates the necessity of contact for horizontal acceleration.

PREREQUISITES
  • Understanding of Newton's Third Law of Motion
  • Basic knowledge of force vectors and their applications
  • Familiarity with concepts of friction and surface interaction
  • Knowledge of acceleration and its effects on motion
NEXT STEPS
  • Explore the implications of Newton's Laws in real-world scenarios
  • Study the effects of friction on tire performance and vehicle dynamics
  • Investigate the role of mass and inertia in horizontal acceleration
  • Examine case studies involving vehicles on various surfaces, including icy conditions
USEFUL FOR

Physics students, automotive engineers, and anyone interested in the principles of motion and force application in vehicles.

ChristPuncher
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Homework Statement



I was reading a textbook that gave an example of Newton's Third Law using the explanation for every force there is an equal and opposite force. The example given was a car tire on the road being accelerated moving in the negative x direction. In the supplemental diagram (see image) there is a vector force horizontally from the tire as a result of the car being accelerated and the force of the road opposite the direction of motion. The book then goes on to state that the car actually moves the road but because of the mass of the Earth its unnoticeable.

My question isn't so much about the equal and opposite as it is where does the car touch the road so that it moves when being accelerated (i.e How can the car exert a force downward on the road when the car is being accelerated horizontally?).

Does the tire have a tangential line of force in the negative x direction parallel to the road right where it touches the road?

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, Think about what would happen if you were to accelerate from rest with your car tires on a very smooth icy surface. Or with your car on a lift with the tires suspended in air with no contact surface beneath, and your foot pressing on the acceleartor pedal. Would the car move forward? What horizontal force must be acting in order for it to accelerate forward?
 

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