Final answer:
The driver should check the tires on a heavily loaded tractor-trailer truck. This concept falls under mechanics.
Step-by-step explanation:
If a tractor-trailer truck receives a heavy load, the driver should check the tires. This is an example of mechanics.
When a tractor-trailer truck is heavily loaded, the weight of the load puts extra strain on the tires. Therefore, it is important for the driver to regularly inspect the tires and ensure they are properly inflated and in good condition to handle the additional weight. This falls under the field of mechanics, which focuses on the behavior of physical bodies under the influence of forces.