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magnets magnets Presentation Transcript

  • Chapter 20 Introduction to Magnets
  • In Magnesia in Ancient Greece, there lived a shepherd named Magnus. One day, he was looking after his sheep in the hills.
  • All of a sudden, he felt a mysterious force pulling his iron staff from his hand. Even the iron nails on his sandals were being pulled out.
  • To his great surprise, he discovered that it was a huge, black rock next to him that was pulling his staff and the nails.
  • Soon, news spread across the country about the strange rock that had the power to pull things to it.
  • The Greeks later found other similar black rocks which had this power. These rocks were named ‘magnets’, after either Magnesia or Magnus himself.
  • Magnets are made into many shapes and sizes. U shape horseshoe ring button straight bar Today, scientists know that magnets interact with some metals.
  • At a glance…
    • Magnets interact with some metals.
    • Magnets are made into different shapes and sizes.