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Thank you. I think I did read about the x+= in the “distant past”, but have never used it, so never think of it. I have never understood Scope variables. Thank you for the brief explanation - that may get me started. I have never “gotten into” these more obscure functions. I think they would make de...

I am impressed with your version! Your layout makes it look very simple. I see you also introduced an “air friction” force, presumably to prevent situations where the spring lengths become negative, causing situations like the lower weight going above the upper one etc. which eventually happens with...

It’s crazy, but none of the usual ways would work. But It worked on my phone, so I copied it there & texted it to my iPad then copied to SmartBASIC. One of the simpler tricks I have to do when things go wrong. (My iPad is getting too old). The program runs fine, but I haven’t looked at the code yet.

A couple more comments: I hadn’t thought about applying the air drag to the Force, I thought of it as reducing the velocity so applied it there. I think the effect would be the same, since (a) is proportional to Force. I’m not trying to get the numbers of a real system model, only the “picture” of a...

As a start, I added an “acceleration factor”, af, making the equation a=af*f/m in both places where the equation is used. With values of around af=0.1 and also REMing out the air drag in both places [v=v*(1-.0001*v^2)], the whole thing plays out with a very nice looking resonance. However, I still h...

As a start, I added an “acceleration factor”, af, making the equation a=af*f/m in both places where the equation is used. With values of around af=0.1 and also REMing out the air drag in both places [v=v*(1-.0001*v^2)], the whole thing plays out with a very nice looking resonance. However, I still h...

Thank you for your detailed comments. They are very helpful. I have to look at them in detail. At 1st glance I’m not sure if I have explained my method clearly. 1) The velocity & acceleration are per “t”, not per actual second. At least that’s what I intended. Therefore d=.5*a*t^2 reduces to d=a/2, ...

Sounds interesting. Does it use the same “incremental changes” method? Or does it use actual equations? I have never tried 4, only 3 (Sun, Moon, & Satellite). I also made it work as Earth, Moon, & the Artemis II recent loop around the moon. I can post it if you’re interested.

Dutchman- Did you see the replies here? And my posting under this topic (BASIC Programs) ? (You indicated interest in it.)

Yes. You found it ok then?