Question

Why do the load-carrying heavy vehicles have a large number of wheels?

Answer 1

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 a large number of wheels so that the pressure on the road is reduced due to the larger contact area. Also, using a large number of wheels ensures that the force due to the load is shared among the tyres and no single tyre is under stress.