Rigidbody . Simple help for noob. ,Noob Need Help.

Hello comunity. I want to make game in which at the beginning character mast carry a few boxes under his head. You can imagine this if you take any box in your hand and up them. I try to realise this with rigidbody+box collider on my main charactor and rigitbody+box collider on box item, but when i press start game buttom i saw that no drag betwen two colliders( ma character just run farvard. and box , which he mast carry on just fallen dawn and it just all what happen. i want effect like when my maiт charactor make mistake and smash some object on his way . the box which he carry on will fallen by gravity and impulse forse. please help what i need to use for realise that plan TY gooooods of programming code)!