Algodoo

I discovered if I make the friction of the inclined plane very large (>= 1*10^15) or infinite, then u2 becomes a negative number.

I know, I know..... Who cares, right? Probably no one, but I wanted to bring that to your attention in case you happen to see any issue with that.

As usual, your tutorial scenes are excellent teaching tools!

Thanks Xray,

The problem was math.toInt(+inf). Speaking of friction, I noticed that if the horizontal and inclined boxes are glued to the background, then the friction forces differ from the forces on the same boxes when they are double hinged to the background. When the boxes are glued to the background, then the sum of the forces in the x (or y) direction do not equal to zero, which they should.

Quote: "When the boxes are glued to the background, then the sum of the forces in the x (or y) direction do not equal to zero, which they should."

I know what causes that but I'd rather not discuss it because it's a very sticky subject.