How do i disable sprites overlapping ?

So i have 2 sprites , one of them is the floor and the other sprite is just an object , the location of the second sprite is a bit above the floor. When i start the game the floor stays in place (I set the rigidbody mode to static) , and the object falls due to gravity. When the object reaches the floor it just fall right through it. How do i disable that , i want the object to reach the floor and then stop ?

P.S
I’m using unity 5.5

The floor is going to need a collider 2d, the object is going to need a collider 2d. Make sure they are on physics layers that can react with eachother.

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Works , Thanks !