I recall reading a mid twentieth century scifi anthology that may have been Asimov stories. One stuck out to me but I'm having trouble remembering some of the details. Some of what follows could be incorrect.
There are two main characters who are rivals. I believe the POV character is more theoretically minded and into hard physics. The other rival is more engineering and business minded, caring less for theory. The story focuses on the practical minded man inventing something that is theoretically impossible and the conflict between these two.
The theoretically minded chap doesn't believe that anti-gravity is possible. Despite this, some sort of anti-gravity turns out to be possible, but I believe it ends up being used primarily for energy generation, perhaps by creating a force imbalance on a wheel or by causing a large relative velocity between the stuff being un-inertia-ed relative to the environment, instead of other obvious applications like flying around.
In any case, a large amount of animosity develops between these rivals. At one point, the practical one challenges the theoretical one to a pool game that somehow features the new technology. The theoretical one makes a shot that interacts with this anti-gravity element and unexpectedly kills his rival. Possibly a pool ball enters this field and ends up punching a hole in him. It is suspected that the protagonist had known this would happen and that it was murder in response to the goading, but because no one else saw that possibility in advance it's not provable. The overall message of the work seemed to be that while practical minded people who eschew theory may be able to do useful things and make money, it can be very dangerous to use things you don't understand and theory can lead to important practical consequences.