"Simple Magnetic Phenomenon" Magnetic Phenomenon PPT Courseware 3

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"Simple Magnetic Phenomenon" Magnetic Phenomenon PPT Courseware 3

In 843 AD, on the vast sea where the sky and water were the same color, a sailboat was sailing day and night without a navigation mark or a clear channel. How did they get out of the predicament they were in?

Legend has it that after Qin Shihuang unified the six countries, he built a magnificent Afang Palace for his own leisure and entertainment. Because Qin Shihuang had been assassinated several times, although he escaped by chance, he was still worried all day long for fear of being assassinated again, so he built another palace. When visiting Epang Palace, he ordered craftsmen to install "mechanisms" on the gate so that assassins wearing iron armor and carrying sharp blades would not be able to enter.

Do you know how clever craftsmen solved this problem?

Use your hands and brain

Solve the following problems by doing experiments:

1. What things on your table can be attracted by magnets?

2. Is the magnetic strength of a magnet the same everywhere?

3. How did "Compass" get its name?

4. What happens when magnets are close to each other?

Think and discuss

(1) How to use the knowledge learned today to detect whether an object is magnetic?

(2) How to determine which of the two magnetic poles of an object is the N pole? Which is the S pole?

practise

1. The property of objects attracting iron, cobalt, nickel and other substances is called _______. Objects with this property are called ______.

2. The strongest magnetic part of a magnet is _______. This part is called ________, and they are called ____ pole and ____ pole respectively.

3. Tie a thin wire to the middle of a bar magnet and hang it stationary in the air. You can find that the bar magnet always points in the ________ direction. The N pole of the bar magnet refers to ______ and the S pole refers to ______. .

4. Use the N pole of the bar magnet to get close to the A end of an object. If you find that it can attract the A end, then the A end of the object ( )

A must be S pole B may be N pole

C may be the S pole; D must be the N pole

5. One end of an object is close to a stationary small magnetic needle. When it is close to the N pole and S pole of the small magnetic needle, it is attracted. Then this end of the object ( )

A may be non-magnetic B may be N pole

C may be the S pole. D must be magnetic.

Expand and extend

1. Think about it: Why does the "compass" always point to north?

2. Invite students to investigate and understand the application of magnetic phenomena through various channels after returning home and communicate in the next class.

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Update Time: 2024-11-22

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