Static charge

• When certain insulating materials are rubbed against each other they become electrically charged
• • Negatively charged electrons are rubbed off one material on to the other
  • the material that gains electrons becomes negatively charged
  • the material that loses electrons is left with an equal positive charge
• When two electrically charged objects are brought close together, they exert a force on each other
• • Two objects that carry the same type of charge repel
  • two objects that carry different types of charge attract
• Attraction and repulsion between two charged objects are examples of non-contact force.