|MadSci Network: Physics|
Inertia is a mass's resistance to a force exerted on it; thus, the inertia on an astronaut in flight to orbit is not any different than if she were accelerating in a car. Inertia is a function of mass, and not gravity. -Dennis Formal Definition of Inertia: http://www.britannica.com/bcom/eb/article/1/0,5716,43331+1+42378,00.html? query=inertia
Try the links in the MadSci Library for more information on Physics.