Friction and Acceleration in Automobiles

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SUMMARY

The discussion focuses on calculating the maximum theoretical speed of an automobile starting from rest over a distance of 400 meters, considering static friction coefficients. The coefficient of static friction is given as 0.80, with specific weight distributions for front-wheel drive (62% weight on front wheels) and rear-wheel drive (43% weight on rear wheels). The frictional force is calculated using the formula F(friction) = (coeff. friction)(normal force), emphasizing the importance of static friction in determining the net force required to initiate movement.

PREREQUISITES
  • Understanding of static friction and its role in motion
  • Knowledge of normal force calculations in automotive contexts
  • Familiarity with basic physics equations related to force and motion
  • Concept of weight distribution in vehicles
NEXT STEPS
  • Research the impact of weight distribution on vehicle performance
  • Learn about the differences between static and kinetic friction in automotive applications
  • Explore the calculations involved in determining net force for vehicle acceleration
  • Investigate the effects of different coefficients of friction on maximum speed
USEFUL FOR

Students studying physics, automotive engineers, and anyone interested in the dynamics of vehicle acceleration and frictional forces.

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Homework Statement



Determine the maximum theoretical speed that an automobile starting from rest can reach after traveling 400 m. assume that the coefficient of static friction is .80 between the tires and the pavement and that (a) the automobile has front wheel drive and the front wheels support 62% of the automobile's weight, (b) the automobile has rear-wheel drive and the rear wheels support 43% of the automobile's weight.

Homework Equations



F(friction) = (coeff. friction)(normal force)

The Attempt at a Solution



My question is that why they give me static friction instead of kinetic friction.
((Does that mean that kinetic friction only applies when the acceleration is not constant and/or zero?))-->NVM this
 
Last edited:
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Because your truck started from rest, you need to know how much net force it needs in order for it start moving which must include overcoming friction.
 

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