AST 2002 Chapter Notes - Chapter 4: V Speeds, Tidal Force, Inverse-Square Law
Document Summary
Chapter 4 making sense of the universe. If net force is zero, that is the only time momentum can change. Whenever a net force acts on an object, it must accelerate: mass is the amount of matter in your body and is always the same, weight is the force being measured on an object on a scale. Weight can change: a free-fall is when an object falls to the floor with no resistance, when you free-fall, you become weightless. 4. 2 newton"s laws of motion: newton was able to prove that earth and space share the same physical laws, he proved aristotle"s views wrong, which were accepted as truth and remained unquestioned. Newton changed all that: he brought space and earth together as part of the universe. This was also the beginning of astrophysics: the next twenty years were productive for newton. Force = mass x acceleration (f=ma: third, for every force, there is an equal and opposite reaction force.
