Originally Posted by _Sir_Charles_
I would say that a guy like Chapman there are fewer balls hit at all, hard or not.
But for me, the way I look at it is, the harder the pitch...the harder the hit. The transference of velocity from the pitcher to the bat seems to match up somewhat. A hard hit ball off of a "soft tosser", all of the velocity off the bat (okay, MORE of the velocity) is generated by the hitter. A ball hit off of a 99 mph fastball goes farther/faster it seems. At least that's how I perceive it. I've got no data to back that up. If anybody could verify that, jump on in.
Most of the power is supplied by the bat speed of the hitter. The pitch velocity does supply some of it, but a very small amount when compared to the bat speed and cleanness of contact.