Um, this is my first question here, so I'm really sorry if there's something wrong with it! Anyways, what I'm kinda confused about, actually stems from a comment on another question here: Looking for an intuitive understanding of normal force
The comment says and I quote "In the particular situation you're considering, note that the ball is accelerating. Whereas in the first case you have a static situation --- one in which the net force on the ball must be zero --- in the second the ball is moving in a circle. This continual change of direction requires a certain force to maintain. This force can come from two places --- gravity and the normal force. These must combine in such a way not as to make zero, but as to make some inwards pointing force that causes the ball to accelerate."
What I'm really confused about is when the comment says the force for the centripetal acceleration can come from 2 places, gravity and the normal force. So I wanted to know how much of a role does gravity play based on, say, the angle of the ramp, such as in the picture below? (this is actually the same picture as in the post linked)
I've also read through alot of problems concerning similar cases but so far, I haven't found one that really talked about this. The comment in the link above is the closest thing I've found to explaining it.
Thanks in advance!