My object is falling through the platform

I was fooling around in unity 5.5 and making a simple game where a rigidbody ball jumps on a platform, but on spawn, it just falls through.

The ball has Sphere Collider enabled, as well as the platform has Box collider enabled.

My ball Inspector: https://gyazo.com/f416684cdbfce560201cface1a084508

My Platform Inspector: https://gyazo.com/37d871e52ea3632dfa2206e9da1b985e

Any answers are much appreciated!

EDIT: I Fixed it, it was the ball was declared as a Trigger.