12. Eight or more wheels are provided in a heavy truck. This is done to: *
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The heavy truck is fitted with 6 to 8 wheels to reduced the pressure exerted by truck on the ground. pressure = force / area. If truck is having only two wheels then area of contact of wheels with the road is less and pressure is more.To reduce the pressure we use 6 to 8 wheels for heavy trucks.
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Truck have many wheels because, the weight of the heavy truck needs to be distributed equally and less energy is consumed to carry the load inside the truck.
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