In a glider being towed through rotor to reach wave, you learn to tighten your shoulder straps to keep your head from bouncing off the canopy. One of my batter

In a glider being towed through rotor to reach wave, you learn to tighten your shoulder straps to keep your head from bouncing off the canopy. One of my batteries disconnected in a big bump. In airliners it happens that people bounce off the ceiling and crash back down. Even if you have loosened your seatbelt for comfort, it will keep you from bouncing off the ceiling. 0g will have loose objects floating. -.25g will have them on the way to the ceiling. The autopilot will react quickly to restore 1g and bring everything and everybody back down.