Question

Why do the load carrying heavy vehicles have large number if wheels

Answer 1

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Steering wheel is only responsible for maneuvering the direction of the tyres. Since most old age trucks did not have electric or hydraulic power steering, a big steering would reduce the number of rotations required to acquire the maximum turning radius.

Modern trucks and buses such as Volvos have an electronic and hydraulic assisted steering wheel which is much smaller compared to the predecessor.

It is all about what kind of steering assembly has been provided with the chassis and the steering rod strength required as per the weight and tyre size of the vehicle.

Answer 2

Answer:

We know, Pressure = Force/Area

So, greater the area of contact between two surfaces, lesser will be the pressure. So, the load carrying heavy vehicles have large number of wheels so that the pressure on the road is reduced due to larger contact area. Also, using large number of wheels ensures that the force due to the load is shared among the tyres and no single tyre is under stress.