Algodoo

Good idea!

Make a block, and make its density 100 and attraction 3.1 then have it collide with A, then place your pressure spawner thing over it, and tada. You may modify the amount of balls spawned by changing density/attraction of the block.

Awesome, except that you should make the balls red.10/10

Dude how do you make a spawner? I've been searching for it in a week

Re:How to make spawner by Combinator:
I'm also a beginner and had the same problem.
Looked at the source for this thing. The little circle collides with an adjacent big circle
and runs this script (copied and pasted):
(e)=>{scene.addcircle({
radius := 0.5;
restitution := 1;
collideset := 64;
pos := e.pos
})
}
Means create circle with radius 0.5 metres, restitution 1, and the position of the thing that's running the script.By default it has random colour.Y'wanna spawn ragdolls? You need to create every polygon, fixjoint, hinge and circle in the model!