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UA - PH/AY 101 - Class Notes - Week 2

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UA - PH/AY 101 - Class Notes - Week 2

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background image 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

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School: University of Alabama - Tuscaloosa
Department: Astronomy
Course: AY 101 - Intro to Astronomy - Jeremy Bailin
Professor: Jeremy Bailin
Term: Spring 2015
Name: AY 101 - Lecture Sept 8 Notes
Description: Physics of Orbit Thursday, September 8, 2016
Uploaded: 09/08/2016
2 Pages 18 Views 14 Unlocks
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