ELECTRIC CHARGES AND FORCES

ELECTRIC CHARGES AND FORCES

1. ELECTRIC CHANGE

   • an electric charge can attract a neutral object
     • The polarization process
   • Harging by contact varies with materials
     • Charging by collision
     • Turboelectric charging
   • Electric charge comes in 2 distinct types
     • Positive and negative energy
   • Rubbing objects together can charge them
   • electric charge is quantizied
   • A coulomb is a large amount of charge
   • Electric charge can be transferred between objects
   • Not all materials are good conductors
     • free electrons

2. Electric force

   • electric force is similar to the gravitational force
     • Atomic system
     • astronomical system
     • Similarities and differences
   • Electric forces keep most objects
   • Electric force acts along line between the charges
   • Coulombs describe the electrics force

3. Combining electric forces

   • Electric forces add by vector addition
   • Electric forces can be added graphically
   • A spherical distribution of charge acts just like a point change
     • Surface change density