Bouncing a rigidbody on a rigidbody

I am playing around with Unity and I am trying to get a sphere to bounce on a cube. I have the sphere with a collider and a rigidbody. In the collider I have a physics material that allows it to bounce on surfaces and that works fine, until I attempt to bounce it on another rigidbody like my cube. I want to eventually be able to move the cube while playing and have the sphere bounce. But at the moment the sphere goes to a dead stop when it touches the cube. I set the cube to kinematic and it lets the sphere bounce on it but I can't figure out how to move the cube side to side. Please help! Also the cube does have a collider.