[jwsea55]

My computer has no sound and I do no read lips. I do not know the explanation the guy on the video provided.

The bottom doesn’t move because it is still attached to the rest of the slinky.

Essentially, two science geeks yakking in physic's speak. The bottom doesn't move because of the slinky's tensioned coil. The tension has not allowed the "communication" of release from the top of slinky to transfer down to the bottom. Does that work?

[KittenClaws]

Awesome is right! I was and still am, a mediocre math student; but I love physics. Wish I would have paid more attention in school.

The closest explanation that I could comprehend in the simplest way, was “external force” on the “center of mass”

[Randy Larsen]

I’ll try my hypothesis...

The downward pull of the stored tension in the slinky plus gravity is exactly the same as the tension of the slinky thus counteracting the pull of gravity. Once the tension+gravity equalizes to the weight of the slinky alone, the slinky falls at the normal rate of 32 ft.per sec./per sec.

I hope that makes this clearer for you.

If not, well you can say I’m full of $hit.

[SatinDoll]

Yeah, but that seems to be what I said.

If the slinky, instead of being a plastic coil was a solid-walled plastic cylinder, the bottom would move at the same time as the top.

[unread]

Look to the pendulum, it is there you will find your answer grasshopper....(partiality anyway).??

[Partisan Gunslinger]

The bottom doesn't move because of the slinky's tensioned coil. The tension has not allowed the "communication" of release from the top of slinky to transfer down to the bottom.

You win.