Platform Bounce Physics (like Flabby Physics)

Hey there, I am trying to get a 2D ball to be pushed by the moving 2D platform. It is very similar to how "Flabby Physics" works, where the platform's movement is triggered by a button and it will push the ball most mid-movement as there's the most force then. I tried using Physics Material, but it doesn't work the way I want it to.

Thanks for answering!