# Is there any role of steering in turning?

I am aware of the practical requirement of turning the steering wheel to turn a car while going on a straight and even curved road. But in the proofs of turning of car on leveled or banked curves, we see the tyres straight.

Assuming a road where a car enters tangentially to a circle with some velocity satisfying the conditions for turning (no skidding), is there no reason in an ideal case to steer the car ?

What all reasons in practical life make it necessary to steer ?

• Consider a tank - its 'wheels' can't change orientation yet it can make turns, why is that? Also you might want to ask the question 'Are the wheels straight, or do they appear straight? Feb 2, 2014 at 18:05
• @Kvothe : Tanks actually turn by slowing one of the tracks, see here and no I am assuming ideal case of completely straight tyres and still cannot find reason for steering ! Feb 2, 2014 at 18:08
• @rijulgupta: Actually, the tires do turn when a car makes a turn. Try this: have a person go into a car while you stand outside, and tell them to turn the steering wheel. You'll notice that the front wheels rotate. When a car turns, it does so by turning the front wheels around. You're correct that the example of a tank is different; tanks turn by slowing one of the tracks, which is not what cars do when they turn. Apr 13, 2014 at 15:28
• @dumpsterdoofus: I am not asking the practical need ! That is needed due to different speeds and different radii of curvature. I am asking about the need of steering in idealistic cases, would a car turn itself along a turn if taken with some certain velocity. Apr 13, 2014 at 17:27
• @rijulgupta: Hmm, so you're asking what would happen to a car if it straightened out its front wheels in the middle of a turn? I'm pretty sure it'd go straight again. If the wheels are straight, there's no perpendicular force being applied to the car, so it's just keep moving in a straight line (assuming it's moving on flat ground). You have to turn the wheels to make the car turn. Apr 13, 2014 at 17:57