The devs have said that weapons don't have a traditional damage stat number like most isometric RPG games, instead the amount of 'damage' you deal is based on the force of the impact which in turn can also do things like knock down the opponent.
As Komuflage said, I don't think you'll be able to equip random items as 'weapons' (ie: Brooms, chairs, plates, ect...) but if objects were to strike someone with enough force it would cause damage and potentially a knockdown effect. Now how you as a player would go around using that against your opponent isn't very clear. I don't think you would be able to personally pick up an item and throw it (the out of combat object manipulation uses a collision free control system). But with thaumaturgy it could be possible to propel objects towards your opponent, or you could make objects roll down a hill, fall from cliff or from atop a high building.
TL DR: I don't think there's specific features put in to allow you to use random objects as weapons, but the nature of the physics engine makes it possible for any object that has mass and can be moved to deal 'damage' or knockdown a character.