AY 101 - Lecture Sept 8 Notes
AY 101 - Lecture Sept 8 Notes AY 101
Popular in AY 101 - Intro to Astronomy - Jeremy Bailin
verified elite notetaker
Popular in Astronomy
This 2 page Class Notes was uploaded by Savannah L on Thursday September 8, 2016. The Class Notes belongs to AY 101 at University of Alabama - Tuscaloosa taught by Jeremy Bailin in Spring2015. Since its upload, it has received 42 views. For similar materials see AY 101 - Intro to Astronomy - Jeremy Bailin in Astronomy at University of Alabama - Tuscaloosa.
Reviews for AY 101 - Lecture Sept 8 Notes
Report this Material
What is Karma?
Karma is the currency of StudySoup.
You can buy or earn more Karma at anytime and redeem it for class notes, study guides, flashcards, and more!
Date Created: 09/08/16
LECTURE – THURSDAY SEPT 8 PHYSICS OF ORBITS Force- causes acceleration, a push/pull that modifies an object’s motion (ex. Gravity, friction, rotation of earth, tension, electromagnetism) TYPES Gravity- matter attracts other matter (attraction depends on mass) Electromagnetism- +/- electrical charges (opposite charges attract, like charges repel) Strong Nuclear Force- very short-range force that keeps particles in the nucleus of an atom together Weak Nuclear Force- very short-range force responsible for radioactive decay of nuclei When atoms get close: 1. The – electrons of an atom repel the – electrons of the neighboring atom (ex: the electrons in the floor repel the electrons in my shoes) 2. The + nucleus of one atom attracts the – electrons of neighboring atom (ex: the atoms in the ball attract the other atoms in the ball) Attractive force of gravity is responsible for pulling things toward earth Attractive and repulsive forces of electromagnetism are responsible for - Holding solids together - One object pushing on another (holding it up) - Friction - Chemical reactions - Air resistance - Everything else Gravity is very weak, can only dominate very large objects Newton’s Second Law: when a force (F) acts on a mass (m) it produces an acceleration (a) o a = F/m OR F = ma for a given mass, more force = more acceleration for a given force, more mass = less acceleration no force = uniform motion (Newton’s first law) Motion- speed, velocity, acceleration Speed- how fast are you going? Velocity- speed and direction Acceleration- change in velocity o NOTE: if you are running in a straight line going 4mph, and then turn right, still going 4mph, you ARE considered accelerating because you are changing direction even though you are not changing speed Net Force- total after balancing opposite forces acceleration results from net force; if there is no acceleration, all forces must be balanced Gravity: 2 Newtons Law of Universal Gravitation- Fg = G(M M )/d 1 2 forces are equal and opposite force is proportional to mass force follows inverse square law with distance Conservation of Angular Momentum- tendency for an object to go around (orbit or rotate) Angular Momentum = mass x velocity x radius (only way to change is to give or take from someone else, aka Kepler’s second law)
Are you sure you want to buy this material for
You're already Subscribed!
Looks like you've already subscribed to StudySoup, you won't need to purchase another subscription to get this material. To access this material simply click 'View Full Document'