On 2025-03-22 16:31:37 +0000, Luigi Fortunati said:

In the animation https://www.geogebra.org/classic/sr8fxezb there is the
force F of the hand that pushes the point A of the car.
=20
The force F that pushes the car is certainly a "net" force because
there is no one to push the car from the other side.
=20
But is the force F that pushes the point A of the car also a "net"
force?

A net force to the car is not a net force to a part of the car.
A part of a car has inteactions with other parts of the car. In addition, gravity affects the part and the ground under the car touches or does
not touch the part.

--=20
Mikko

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On 2025-03-24 08:19:19 +0000, Luigi Fortunati said:

Mikko il 23/03/2025 06:44:06 ha scritto:

On 2025-03-22 16:31:37 +0000, Luigi Fortunati said:

In the animation https://www.geogebra.org/classic/sr8fxezb there is the
force F of the hand that pushes the point A of the car.
=20
The force F that pushes the car is certainly a "net" force because
there is no one to push the car from the other side.
=20
But is the force F that pushes the point A of the car also a "net"
force?

A net force to the car is not a net force to a part of the car.

I agree: the force F of the hand is a net force on the car but it is
not a net force on point A.

Consequentially, on point A there must be *also* a force acting
contrary to the force F.

So, does the blue reaction contrary force FR of my animation act only
on the hand that pushes (as you all keep saying) or does it act *also*
on point A of the car?

The interactions are between material parts. A point does not interact.

--
Mikko

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