I have often heard commentators describe particular bowlers as having a "heavy ball". By context, this seems to refer to a fast bowler being able to bowl a delivery that seems to impact the bat with greater force that would be expected given their pace. In other words, they aren't a particularly fast bowler, but the ball travels with greater force than is suggested by its pace. For example, see the description in cricinfo's glossary of terms (use find 'heavy ball').
This is absolute nonsense in terms of physics, but it is a pervasive concept that seems to be held true by cricketing people, so there must be a sensible explanation that accords with sensible physics that is being miscommunicated or misunderstood by the use of the phrase 'heavy ball'. I would perhaps make a parallel to the notion in Basketball that good jumpers seem to 'hang in the air' longer than bad ones. Again, this seems to make no sense physically until you realise that good jumpers have learned to use similar tricks to ballerinas to keep parts of their body elevated for longer by changing their centre of mass (see for instance here and compare with Michael Jordan's iconic split leg dunking pose). Is there is similar explanation for the origin of this confusing term in cricket?