On 2024-01-28 22:58:55 +0000, Luigi Fortunati said:

Luigi Fortunati il 23/01/2024 12:38:54 ha scritto:

[[Mod. note -- I would say that that's somewhat confusing terminology.
Forces are never "created" or "destroyed"...

That's exactly what I say too.

It is Einstein who talks about forces that "disappear": see the case of
the painter when he falls from the scaffolding (and no longer perceives
any force) and the case of the elevator when the cables break (and
whoever is inside floats while he falls) .

If you want to see a force appear, the initial position of the ball
must be above the plane, not touching it.

If you want to see a force disappear you can use a spherical surface
istead of a plane.

Mikko

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