AST 2002 Chapter Notes - Chapter 4: Orbital Speed, Net Force, Free Fall
Document Summary
Astronomy chapter 4: making sense of the universe- understanding motion, Slowing represents a negative acceleration, which represents velocity decreasing. He did this by dropping weights off of the leaning tower of pisa: air resistance, not gravity, causes the difference of a feather and a rock falling. Or about 10 m/s with each passing sec. Newton"s third law: ex 2: a rocket engine generates a force driving hot gas out the back, which creates an equal and opposite force that propels the rocket forward. Ex: falling rocks, orbiting planets, molecules moving in air: radiative energy: energy carried by light. All light carries energy, which is why light can cause changes in matter. Ex: light can alter molecules in our eyes, allowing us to see or warming the surface of a planet: potential energy: stored energy. Which can later be converted into radiative or kinetic.
