Luigi Fortunati

2024-01-24 03:38:54 UTC

In my animation

https://www.geogebra.org/m/thsyz5me

there is a body on a frictionless plane.

Each inclination of the plane corresponds to precisely identified

forces.

If the plane is horizontal (angle=0 degrees) the body stands still

because there are two opposite and equal forces (black and blue).

If the plane is inclined (0<angle<90 degrees) there are 3 forces:

2 (black and blue) opposite and equal (but of decreasing intensity)

and 1 (red and unopposed) of increasing intensity.

If the plane is vertical (angle=90 degrees) there is only one red force.

Am I wrong if I say that these forces transform into each other (and

vice versa) but are not created or destroyed?

Luigi Fortunati

[[Mod. note -- I would say that that's somewhat confusing terminology.

Forces are never "created" or "destroyed", i.e., there's no active agent

which "creates" or "destroys" a force, and there's no differential

equation governing such a process.

I find the following conceptualization to be more useful: There are

certain forces acting in a given physical system, and if the physical

system changes (such as changing the plane's inclination angle), the

forces may also change.

-- jt]]

https://www.geogebra.org/m/thsyz5me

there is a body on a frictionless plane.

Each inclination of the plane corresponds to precisely identified

forces.

If the plane is horizontal (angle=0 degrees) the body stands still

because there are two opposite and equal forces (black and blue).

If the plane is inclined (0<angle<90 degrees) there are 3 forces:

2 (black and blue) opposite and equal (but of decreasing intensity)

and 1 (red and unopposed) of increasing intensity.

If the plane is vertical (angle=90 degrees) there is only one red force.

Am I wrong if I say that these forces transform into each other (and

vice versa) but are not created or destroyed?

Luigi Fortunati

[[Mod. note -- I would say that that's somewhat confusing terminology.

Forces are never "created" or "destroyed", i.e., there's no active agent

which "creates" or "destroys" a force, and there's no differential

equation governing such a process.

I find the following conceptualization to be more useful: There are

certain forces acting in a given physical system, and if the physical

system changes (such as changing the plane's inclination angle), the

forces may also change.

-- jt]]