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Magnets All Around Us
Transcript of Magnets All Around Us
We would be in bad shape without the Earth's magnetic field. It protects us from particles traveling from the sun! Security Toys Computers Clocks Fans Navigation Vending Machines Credit Cards Attaching Vending machines check each dollar bill as it is inserted into the bill collector. A special part of this bill collector tests to make sure the money is magnetic. Real bills are minted with ink containing iron and are therefore magnetic. If the bill is not magnetic, then it is counterfeit (or fake) money. Fans use magnets to help their blades spin more quickly and quietly. The pushing forces of a magnet help the blades move without making as much noise because the parts do not touch. Computers use magnets in their hard drive to store memory, read CDs and move smaller parts. Many kid's toys use magnets. Kids can test out the "magic" properties of magnets. It's interesting for kids to investigate the invisible pushing and pulling forces. Magnets are commonly used for attaching materials without causing damage. Teachers use magnets to attach papers to their magnetic white boards. Families attach pictures or good work to their refrigerators at home. Airports use metal detectors equipped with magnets to help identify people who might be bringing unsafe materials onto airplanes. Handheld metal detectors can also be used. These are sometimes referred to as magnetic "wands." When someone uses a credit card or a gift card, they must "swipe" the card along a special machine. The black strip on the card has magnetic material in it which communicates with the machine to transfer the correct amount of money. The magnets found in clocks and watches are used to help the hands of the clock move smoothly. A compass is a tool used to determine which direction you are facing. A proper compass will point towards the north pole, because the north pole seeking end of the magnet was placed at its tip.