Question

"why do heavy trucks have sixs to twelve tyres
insted of conventional four tyres ?​

Answer 1

Answer:

Trucks carrying heavy loads use eight tires to reduce the pressure on its tyres. As the surface area increases the force/load is spread over a larger area and hence reducing the pressure. This reduction in pressure allows the truck to move better and also protects the tyres from excessive wear and tear.

Answer 2

Answer:

Since pressure is inversely proportional to area of the surface ,trucks on being heavy have 6 to 12 wheels to increase the same

hope it helps