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"Si Nan's Revelation" The Mystery of Magnets PPT Courseware 2
The Chinese made Sinan more than 2,000 years ago. Sinan carved a piece of natural magnet into the shape of a spoon and allowed it to rotate freely on a horizontal base with an outer square and an inner circle engraved with directions. As a result, the key handle of the magnet always pointed to the south and the other end of the key pointed to the north. This is the earliest compass - Sinan.
Guide car tips:
Please use one pole of the magnet and rub it on the sewing needle in the same direction more than 20 times, so that the magnetism will be stronger.
homemade compass
Purpose: To magnetize sewing needles into small magnetic needles.
Rub the south pole of the magnet against the tip of the sewing needle so that the tip becomes the S pole.
Magnets made of steel materials such as sewing needles can retain their magnetism for a long time.
The friction time should be more than 20 times. careful! Don't prick your hand.
Compass production plan
1. Which method to choose:
2. What materials are needed:
3. What to do first:
4. What are you doing:
5. Group division of labor:
The principle of compass
The magnetic needle always points in the north-south direction.
The magnetic pole where the magnetic needle points north is called the North Pole, represented by "N";
The magnetic pole pointing south is called the South Pole, represented by "S".
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"Si Nan's Revelation" The Mystery of Magnets PPT Courseware:
"Si Nan's Revelation" The Mystery of Magnets PPT Courseware The Story of the Compass The compass is one of China's four great inventions. Around the end of the Warring States Period, the Chinese had discovered magnets and their ability to attract iron products. In the early years of the Eastern Han Dynasty, it was discovered that magnets could point north and south, so they began to use...