[[Mod. note -- I apologise for the delay in processing this article,
which arrived on my computer on 2024-02-15, but was mistakenly classified
as spam.
-- jt]]

On 2024-02-15 12:31:18 +0000, Luigi Fortunati said:

Gravity manifests itself as gravitational force if there is an obstacle
(the stone on the wall of the well) and as gravitational acceleration if
the obstacle is not there (the same stone as before that detaches from
the wall and falls).
=20
In the first case there is gravitational force (and there is no acceleration), in the second case there is gravitational acceleration
(and there is no force).

In the sencond case there is a force: the acceleration means a change
in the momentum (i.e. the quantition of the motion) and the time
derivative of the momentum is the force. That force is equal to the
force in the first case.

However, gravitation is best understood as an acceleration field and
the force as secondary.

Mikko

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