Better check the manual about expressions
This is part of the basics of C2.
[quote]First. How i can do a weight of box. I pushing box with character and when i push paper box, this box push easy, when is a wooden box pushing is harder to do.[/quote]
Emulate this by changing the force/impulse of the push. (refer to the physics advanced tutorial
[quote]Second: When I lay brick on brick in the small towers, the tower itself will quickly falling apart because ceg?u bounce away from each other. How to set the parameters of physics to lay bricks calmly.[/quote]
As already said in this topic, try to tweak the density as well as the elasticity properties.
If less elastic, the bricks should les propagate their own momentum and spread their force to the stack.