If Keiji is standing upright and holds a loose necklace by one end, what happens to the necklace if he suddenly inverts his position to do a handstand? Respond very briefly.
When Keiji inverts his position to do a handstand, the necklace, which was previously hanging due to gravity, will fall down towards the ground, which is now above Keiji's hand. The segments of the necklace will dangle above his hand, and the loose end that was previously hanging down will now point up towards the ceiling, opposite the direction of gravity. This is because gravity pulls objects towards the Earth, so when Keiji's orientation changes, the direction in which the objects hanging from him are pulled by gravity also changes.