Question

Tractors have large tyres, bulldozers have caterpillar tracks and heavy buses, trucks have eight rear wheels. Give one reason common to all these

Answer 1

this is that tha weight all these heavy machinery can evenly distributed over the tyres to reduce pressure that resuts also in more speed of these vehicles.

Answer 2

Pressure  is the reason.

Explanation:

As we know formula,

Pressure = Force per unit area

For machines like bulldozers, tractors and buses the force which is their weight is large in comparison to other vehicles like bikes or cars.

Pressure will increase as the force increases which is not good for the roads.

So, we increase the area by increasing the total surface area using multiple tires or large ones and as we know area is inversely proportional to pressure, with the increase in area then there is a pressure decrease.