Driving a SUV in airless enviroment

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Discussion Overview

The discussion revolves around the dynamics of driving a vehicle, specifically an SUV, in an airless environment and the implications for rollover risk during straight-line motion and braking. Participants explore the role of air resistance and friction in vehicle stability and rollover mechanics.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions whether driving in an airless environment increases the risk of rollover, suggesting that friction is the only force at play without air resistance.
  • Another participant argues that air resistance is not a significant factor in preventing rollover, implying that other forces are more critical.
  • A different scenario is introduced, comparing the original question to driving a vehicle in water, raising similar concerns about stability.
  • One participant discusses the relationship between air drag force and vehicle speed, proposing that air drag acts as a balancing force against friction, particularly affecting SUVs due to their design.
  • Another participant clarifies that rollover is primarily influenced by the vehicle's momentum and the forces acting perpendicular to its motion, stating that air drag's role is minimal except in specific conditions like high winds.
  • A later reply emphasizes the torque effects of friction and air drag, suggesting that at high speeds, air drag could create a significant reverse torque that might influence rollover dynamics.

Areas of Agreement / Disagreement

Participants express differing views on the significance of air resistance in rollover dynamics, with no consensus reached on its impact in an airless environment or during high-speed scenarios.

Contextual Notes

Participants reference various forces and torques involved in vehicle dynamics, but the discussion contains assumptions about the conditions under which these forces operate, such as speed and environmental factors. The interplay between air drag and friction remains unresolved.

yasar1967
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Imagine driving a hypothetical SUV(or any car for that matter) in an airless environment and assume that you manage to feed oxygen to your engine somehow, would that increase the risk of roll over during a straight-line motion and/or severe braking as the friction is the only force to cause it in the absence of air resistance?
 
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I can't imagine that air resistance is an important factor in preventing a vehicle from rolling over!
 
yasar1967 said:
Imagine driving ... would that increase the risk of roll over during a straight-line motion and/or severe braking as the friction is the only force to cause it in the absence of air resistance?

same qestion: but driving your land rover with a snorkle in water about 2 m deep.
 
Air drag force is directly proportional to the square of car's speed. Wouldn'T you say that it's a balancing force to the friction's attempt to apply torque at the wheels to twist the the car around its center of mass? Air drag force is also proportional to the area. It's effect is higher above the center of mass than below of the car's front(especially SUVs) thus eliminating the possibility that it's torque effect is balanced.
 
Drag acts parallel to the direction of motion. Rollover is perpendicular to the direction of motion. The only time rollover depends on air drag is when high winds are involved (and that does happen on bridges every now and then).

Rollover happens because the cars momentum is going forward while the wheels are trying to turn the momentum to one side. It is that turning force that the momentum is acting against to roll the car over.
 
There's a misunderstanding here probably the blame is on me, I was referring to the roll over that happens on the same way the car travels i.e. car's back is lifted to the air.
In that case, imagine the torques of the friction force between the wheels and the road and the twist effect they create due to "Level Arm" between them and the center of mass.
... and imagine now the air drag force acting on front top of car with a reverse torque effect and that effect can be powerful on high speeds.
 

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