Final answer:
The question likely refers to a scenario where a person's position is changed by a force that doesn't affect welded items, such as gravity, an elevator, wind, or water currents, but without additional context, it's difficult to provide a precise answer.
Step-by-step explanation:
The question refers to a force or phenomenon that can move a human without affecting objects that are rigidly attached. Gravity is a natural phenomenon that changes the position of a person by pulling them towards the center of the Earth or any other celestial body. However, it cannot selectively take or leave items; it acts on all matter uniformly. This suggests that the question might be somewhat metaphorical or abstract. For instance, an elevator can change the position of a person vertically, but everything inside the elevator, welded or not, would move with it unless explicitly separated. Another possibility is that the question refers to external forces or conditions such as wind or water currents, which can shift a person's location without necessarily affecting items that may be too heavy to move or firmly secured to the ground. Nonetheless, without more context, we can't provide a concrete answer to this scenario.