just like gravity A force that depends on: Size (mass or charge of objects) Distance between the centers
What particle? carries positive charge in the atom? Where is it? carries negative charge in the atom? Where is it? has no charge in the atom? Where is it?
static electricity Electric charges are separated. More of either protons or electrons in one place. How? Move electrons
Ways to move electrons friction – rub them from one object to another conduction – electrons flow from touching objects induction – electrons move in response to electric field without objects touching
Electric current What is electric current? What does an electric current cause? What is caused when the current is changing?
magnets Electrons with same spin line up and create magnetic domains. Permanent magnets: lots of aligned domains Cobalt, nickel and iron make good permanent magnets.
magnetic properties Always has both north and south pole Cut in half = two whole magnets
Earth’s magnetic poles http://hyperphysics.phy-astr.gsu.edu/ hbase/magnetic/imgmag/mearthbar.gif