The second law of motion. Force equals mass times acceleration. F=MA. Learn the facts about Newton's second law of motion from the National Aeronautics and Space Administration, otherwise known as NASA. The United States government's most infamous agencyand the powerhouse of space exploration explains motion theory.
This NASA video segment from "Flight Testing Newton's Laws" explores how Newton's second law of motion applies to aerospace. Viewers watch an instructor at NASA's National Test Pilot School as he defines the second law and demonstrates how to calculate a person's mass using the law. There is also a discussion about how people experience different g forces at the top and bottom of a roller coaster hill. Footage of the instructor in a fighter jet illustrates what it means to pull 2 and 4 g.