Final answer:
It's false that certain parts of a vehicle are safe tie off points without manufacturer guidance. A truck's trailer bouncing slowly likely indicates it's nearly empty. Tension is truly described as forces pulling in opposite directions, and high-voltage wires are insulated.
Step-by-step explanation:
The statement that trailer hitches, chassis, the frame of the car, or the car's bumper are safe tie-off points is false. It's important to refer to the vehicle's manufacturer guidelines and use designated anchoring points for tie-offs. These parts of a vehicle might not be designed to handle the load and could be unsafe.
Concerning the second question, if you see a trailer bouncing up and down slowly on the highway, it is more likely that the trailer is nearly empty. A heavily loaded trailer would have less bounce due to the added weight, which dampens the vertical movement caused by irregularities in the road. The suspension would be more compressed, reducing oscillation.
Tension is indeed the result of opposite forces in a connector, such as a string, rope, chain, or cable, that pulls each point of the connector apart in the direction parallel to the length of the connector. This statement is true. The ends of the connector experience a force toward the center of the connector.
The high-voltage wires that are held aloft by insulating connectors are indeed wrapped in an insulating material, which makes the statement true. Without insulation, there would be a high risk of electrical discharge to nearby structures or objects.