Electrostatic Forces

A force is a push or pull.
 
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 What causes this to happen? 
  • When you rub a plastic ruler through your hair, some of the elctrons are transferred from the ruler to your hair (or the hair to the ruler).
  • The hair and the ruler become oppositely charged.
  • When you move the ruler away from your hair, you create an electric field.
  • Your hair is pulled towards the ruler, and since it is very light, it moves.
What happens on a damp day? 
What happens if only one of the objects is charged, eg if you bring the charged ruler next to a piece of paper instead? Find out?