physics+review+28-35

//**. as mass of object or both objects increase, the force of gravitational attraction increases.**// ** Universal gravitation constant **
 * Newtons law of universal gravitation **
 * //.// //2 objects in the universe exert gravitational attraction on each other.//**
 * //. newtons law of universal gravitation applies to all objects.//**
 * Universal gravitation and mass **
 * Universal gravitation and distance **
 * . as distance separating 2 objects increases, the force of attraction is smaller. **
 * . g = universal gravitation constant = 6.67*10^ -11 Nm^2/kg^2**.
 * Gravity **
 * . is a constant force exerted by objects that have mass.**
 * . an object that has mass has gravity.**
 * . gravity is a force that pulls things toward the center of the earth.**
 * Weight **
 * . is the pull of gravity **
 * . the pull of gravity on our body mass is toward the center of the earth **
 * . weight is unlike mass **
 * Gravitational attraction **
 * . force of attraction between two objects**
 * . the amount of gravitational attraction between two objects depends on how much mass the objects have and how far apart the objects are.**
 * Coloumb's law **
 * . relationship among electrical forces, charges, and distance**
 * . forces can be attractive or repulsive**
 * . electric fields **
 * . a vector quantity that relates the force exerted on a charge to size of charge.**
 * . DO NOT put negatives in the formula. Ex -1.9*10^-19c**
 * . the charge (a) of a particle is not a vector quantity**
 * . W= work(j)**
 * . V= potential difference(v)**
 * . A= test charge(c)**
 * . charge of 1 proton is +1.6*10^-19c**
 * . SI unit of measure for electrical charge is a coloumb(c)**
 * . magnitude of electric field is measured in N/C (neutrons/coloumb)**
 * . magnitude of electric field is measured in N/C (neutrons/coloumb)**


 * . charge of 1 electron is -1.6*10^-19c **