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Algodoo Force Error?

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Author: s_noonan

Group: Default

Filesize: 65.09 kB

Date added: 2026-04-10

Rating: 5

Downloads: 153

Views: 50

Comments: 2

Ratings: 1

Times favored: 0

Made with: Algodoo v2.2.4

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Algodoo does a very good job of static force analysis except for this one case where it fails. I'm fairly that certain every Algodoo user is concerned about this.;)

P.S. I think I might see what's going on with the bars glued to the background. If no net force in the x direction, then no friction force (like a box sitting on a horizontal plane). The two bars glued to the background act like a single object. Friction force must enter into the calculation else the 3.99 N would be much higher (7.39 N). I still can't figure out how the 3.99 N value is determined.
Last edited at 2026/04/10 11:07:55 by s_noonan
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bluerain
2026/04/10 14:21:18
i think the 3.99N is the bar trying to spin in place but cann't so it show the force getting pushed out of the boxes (left).

if you look at vels they are 0 so is angvels. and the thrusters are just showing the thrust amount and rotation.

so i think its how algodoo runs each phz steps.

i also made the friction inf, and the top and bottom friction do cancel.

idk if im missing anything else?
s_noonan
2026/04/11 11:50:12
I agree with your assessment. I would expect that the forces on the orange bars would match. The normal forces on the left and right orange bars do not match.