Question

Why lorries and trucks carrying heavy loads have a tyres instead of 4?

Answer 1

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.
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Answer 2

Answer:

Larger area produces lesser pressure on the ground.

Step-by-step explanation:

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 reducing the pressure. This reduction in pressure allows the truck to move better and also protects the tyres from excessive wear and tear.