Final answer:
Drawbar or towing connections, like chains, exert a pull parallel to their length known as tension. Tension in a chain increases when it is tightened, allowing it to stay straight and transmit pulling force effectively. The tension in a chain can be large due to the small angle between the horizontal and the bent connector.
Step-by-step explanation:
Drawbar or towing connections, such as chains, exert a pull parallel to their length.
This pull is known as tension and it acts in the direction of the connector.
When a chain is tightened, the tension in the chain increases, allowing it to keep straight and transmit the pulling force effectively.
In situations like pulling a car out of the mud, the tension in the chain can be very large due to the small angle between the horizontal and the bent connector.