I have been using this skill for a few months now and I feel like it is magic. It's been driving me crazy how this works... I have only ever taken AP high school (non calc based) physics and one thing I remember is that for every reaction there is an equal and opposite reaction so the force of the flipper hitting the ball at the top of it's stroke shouldn't "cancel the momentum" of the ball isn't that jibberish? Here is what would happen if you didn't contact the ball at the exact moment the flipper is fully deployed either: a) you deploy the flipper too soon and it is fully deployed and stationary when the ball hits it and the ball will bounce away with too much speed and you often loose control and the ball may drain. or b) you deploy the flipper too late and you strike the ball and shoot it up into the playfield likely not in a direction you have intended. or c) you are so late that the ball hits the undeployed flipper and bounces away or onto the other flipper (this never happens if you are attempting a live catch) this is the explanation I read on a decent pinball tips website: Flip Trap (aka live catch) This technique is the opposite of the Drop Stop. Hit the ball so that it collides with the flipper just as the flipper reaches the point where the flipper is fully extended. If you hit the ball such that it meets the flipper just before it stops extending, the enery imparted by the flipper hit will cancel out the momentum the ball has and the ball will stop right on the flipper where you can trap it. http://www.ipdb.org/playing/wizard.html If you guys can help me understand this it would be great. I'd appreciate a conceptual explanation not just mathematics. Thanks!