Transcript Magnets
Magnets Magnet An object that pulls certain metals towards it . Magnets • A magnet has a force. • A force is a push or a pull. Magnetism Magnetism is a force that makes a magnet able to push or pull another object Types of Metals that are attracted…INCS I.N.C.S. Iron Nickel Cobalt Steel A rock…magnetic? . lodestone is a rock that occurs in nature and is magnetic Magnetic Field space around a magnet where the force of the magnet can still work . Magnetic Field Image From: http://www.bbc.co.uk/schools/ks3bitesize/science/images/magnetic_field s.gif Magnetic Poles . areas of the magnet where a magnet’s attraction is the strongest North and South Magnets have two ends, they are also called poles. The poles are named North and South. Attract •A magnet attracts certain metals Attract To Pull Together S N S N Repel To push apart S N N S 2 Types of Magnets . • Temporary Magnet – an object that loses its magnetism after a short time • Permanent Magnet- an object that keeps its magnetism for a long time Compasses This device shows direction Compasses A compass works because Earth is surrounded by a magnetic field. Compasses North on a compass is attracted to Earth’s Magnet Magnets are Everywhere Refrigerators Cars Heavy machinery North and South N N S S Repel or Attract S N N S S N S N Different Kinds of Magnets N N S S Review (What kind of magnets are these? N N S S Earth is a Magnet •Earth is like a magnet because it has melted iron (molten)deep inside Earth is a giant bar magnet Earth’s Magnetic Field Image From: http://oceanexplorer.noaa.gov/explorations/05galapagos/logs/dec22/medi a/magfield_600.gif Magnetic or Not Review Magnets have 2 _______. poles Magnets attract _____________. metals What 4 types of metals do magnets attract? iron, nickel, cobalt, and steel Review Where are some places you can find magnets? refrigerators, can openers, machinery, etc Earth is like a giant __________. magnet How does a compass work? The magnet on the compass is attracted to Earth’s magnet Review To pull together is to ______. attract To push apart is to ______. repel Can 2 like poles pull together? No Review Can two opposite poles pull together? yes Why is the earth like a giant magnet? is has melted iron inside What are the end points on a magnet called? poles Review What is molten? melted iron Which object is not magnetic? steel nail, iron lock, plastic glass plastic glass Where is a magnet the strongest? at its poles Review Why does a compass always point north? because its magnetic needle is attracted by the magnetic force given off by Earth’s North Pole What do we call magnets that lose their magnetism after a short time? temporary magnet What is the name of a magnetic rock? lodestone