Thanks man got it!
I created an invisible sprite which triggers the barrel when the player walks over it.
I unchecked the "enabled" check as u suggested. Than i created an event when if the player overlaps the invisible trigger sprite, than the physics of the barrel get enabled.
Working great!
Thanks.
P.s.
Now my problem is that id order to make collide the barrel with the surface, i have to set the surface as physics behaviour. Since it's already a Solid, it's not walkable but the player anymore, seems like the solid behaviour and the physics one are not good friends.
Can u help?