Final answer:
To steady themselves when carrying a passenger, a person should maintain a posture that aligns both their and the passenger's center of gravity over their base of support, often involving the passenger holding onto the carrier.
Step-by-step explanation:
When carrying a passenger, they should steady themselves by maintaining a posture that ensures their center of gravity remains over the base of support. This usually involves the passenger holding onto the carrier with their hands or by wrapping their arms around the carrier to keep both of their centers of gravity aligned.
For example, while carrying a child piggyback, the carrier leans forward to keep their combined center of gravity above their feet, much like a father would do to balance the added weight. Similarly, a motorcycle passenger should hold onto the rider or the grab handles to maintain balance and not disturb the rider's control of the bike. Proper balance and posture are crucial for both safety and comfort when transporting a passenger.