static electricity

• describe attraction of charges

  between opposite charges
• describe repulsion of charges

  between same charges
• describe static electricity

  build up of charge on an object
• describe production of static electricity

  rubbing surfaces creates friction that causes electron transfer
• describe production of sparking

  1. charge build up on object
  2. create potential difference between charge object and earth / earthed object
  3. large enough potential difference
  4. electrons jump gap
• describe relationship of distance and electric field

  closest to object - strongest

  furthest to object - weakest
• give direction of electric field lines

  positive to negative