How Does Speed Affect Car Fuel Efficiency and Required Forces?

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SUMMARY

The discussion focuses on the relationship between speed, fuel efficiency, and the forces acting on a car. Specifically, it estimates the ratio of forces required to maintain a speed of 75 mph compared to 65 mph, highlighting the significant impact of aerodynamic drag on gas mileage. Key forces involved include gravity, normal force, drag, and static friction, which collectively influence the vehicle's performance and fuel consumption at varying speeds.

PREREQUISITES
  • Understanding of basic physics concepts such as force and motion.
  • Familiarity with the principles of aerodynamics and drag force.
  • Knowledge of vehicle dynamics and how speed affects fuel efficiency.
  • Basic calculations involving ratios and forces.
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  • Research the effects of aerodynamic drag on fuel efficiency at different speeds.
  • Learn about the physics of vehicle dynamics, including the forces acting on a car in motion.
  • Explore fuel consumption models and how speed influences gas mileage.
  • Investigate tools for calculating drag coefficients and their impact on performance.
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Automotive engineers, physics students, and anyone interested in optimizing vehicle performance and fuel efficiency.

courtney1121
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Estimate the ratio of the forces required to keep your car at a speed of 75 mph to that required to keep your car at a speed of 65 mph. What impact does this have on your gas mileage?

Where should I start?
 
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OK so you will have a force of gravity, normal force, drag, and static friction. Gravity will be down, normal will be up, drag will be towards the left and static friction will be towards the right since they are trying to keep the car at a certain speed.

So where to go from here?
 

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