Reddit mentions of Understanding Physics: Volume 1: Motion, Sound and Heat

You can't come up with radical ideas extrapolated from current science if you don't have an understanding of current science.

Start with research. I think the first thing you need to do is to bone up on physics. Asimov's series is a great popular science examination of physics.

Then read some of the more outre modern popular science books. Hyperspace by Michio Kaku would be an excellent choice.

It's no good trying to write about future physics if you don't have a familiarity with at least high school series physics. A large percentage of SF fans is scientifically literate. If you try handwaving, you'll come off as technically naive. Better to write about elves & vampires, where you can make shit up as you go along.

Understanding Physics by Asimov.

It's 256 pages, and it's the best qualitative description of physics I've come across. I'd recommend it for anyone who's about to start their first year of college-level physics.

Asimov said it himself that his biggest goal in writing was to write clearly, and no subject is better served by that attitude than physics. Moreover, the order in which he introduces new concepts simply makes sense; everything builds seamlessly from what's already been explained. Plus, this is all classical physics, so while it's outdated, it's still the same outdated stuff they teach to freshmen nowadays.