his is a Hard Scifi novel, the first in a series. Here is the back Blurb:
When a failed experiment renders everything within a mile completely weightless, Dr. Kyle Kessler narrowly avoids joining the countless cars, buildings, and people falling into the sky.
In the aftermath, the survivors are given a choice: regain their weight with time or become astronauts in the newest space program. With the wealth of weightless materials, NASA plans to build a spacecraft capable of venturing anywhere in the Solar System without gravity to hold it back.