How to make a ball roll down a triangle?

I'm trying to make it so that a ball can roll/slide down another actor (in this case a green triangle) and once it makes it to the bottom of the triangle, it falls with gravity. How do I make it slide or roll down the triangle? Here's a screenshot of my scene:

I'm trying to the blue ball roll down the green triangle, then fall with gravity. How do I do this?

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