physics doesn't work when isTriggerEnter between two objects

Sorry if this topic has already discussed. I'm beginner in Unity. I have a problem which can't solve. In my scene there are two objects: cube and sphere (like a fireball). When player runs sphere it must physically collide cube and then isTrigger work. So, when I uncheck isTrigger for my sphere all physics between two objects works well, but when I check isTriger physics disappers. In code of OnTriggerEnter there is very simple methods which calls just changing materials of each object. So, how can I get both execution for isTrigger and physical reaction for collision between objects? Thanks in advance.