What would happen if gravity on Earth suddenly doubled?
Well, a doubling of the gravity on Earth wouldn’t really change the *physics* on Earth, since the laws of physics are constant throughout the Universe, but you’re correct in that a lot of systems would no longer behave within their design parameters. For example, a car’s suspension that was designed to support 3000 pounds would suddenly be forced to support 6000 pounds. Some systems or structures have a 100% safety margin built into them, but most don’t. The doghouse you built in the back yard would probably survive, but most large buildings would probably collapse. The fan in your PC would probably continue to run just fine. The strain on the fan motor is mostly dependent on the fan’s mass, which wouldn’t change just because gravity changed. Airplanes likely wouldn’t be able to take off, since they would require much greater speed to overcome their doubled weight. They would probably run out of runway or suffer from blown tires before getting enough speed to lift off. Other than the s
