Prefer using the "Sprite compare instance variable", it will help you later with picking.
Also as you coded things, the problem was that the force was applied only one tick to the object (since sprite.end is = 1 during only one tick).
In that case prefer using an impulse. Force is to be applied every ticks over time.
Read again the tutorial about advanced
physics, all is explained there.Kyatric2012-04-01 16:23:10