"Why does the compass point to the direction" PPT courseware

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"Why does the compass point to the direction" PPT courseware

Part One: Thinking about Problems

[Thinking] Why can a compass point to the direction?

A compass always points north and south when stationary.

Can an object of any material be used as a compass?

【magnet】

Magnet: A magnetic object.

【Activity】What can a magnet attract?

1. Magnetism: The property of attracting ____, ____, ____ and other substances.

【think】

1. How to remove the embroidery needle that fell into the small seam?

2. Can I use a magnet to remove the small bamboo sticks that fell in it? Why?

3. How to separate the mixed iron powder and copper powder?

When using a magnet to attract pins, how can I attract more pins?

2. Magnetic poles (the two ends with the strongest magnetism)

North Pole (N pole): the pole pointing north

Antarctica (S pole): the pole pointing south

[Thinking] If the magnet is divided into two or more segments, does each segment still have N pole and S pole? Come up with your conjecture.

As shown in the picture: the iron block moves from left to right. Please draw the change curve of the spring scale in the picture on the right.

Why does the compass point to the direction PPT, part 2: Class discussion

【discuss】

How to make non-magnetic nails magnetic? Tell me about your method.

[Activity] Conduct experiments according to P3 activity and record the observed phenomena.

【summary】

1. The process of making a non-magnetic object become magnetic is called magnetization.

2. After iron is magnetized, its magnetism cannot be maintained permanently; after steel is magnetized, its magnetism can be maintained permanently.

【think】

1. Can objects of all materials be magnetized?

2. Is the magnetized object an independent magnet?

If so, please draw a diagram to indicate the magnetic poles of the magnetized iron nail.

3. As shown in the picture, the magnet attracts the tips of two iron nails. What will happen to the other free ends of the two iron nails as shown in the picture? ( )

A. As shown by A B. As shown by B C. As shown by C D. Both A and B are possible.

What would be the result if the S and N poles of the magnet in the above question were reversed?

Why the compass can point to the direction PPT, the third part of the content: [Classification of magnets]

1. According to the shape: needle-shaped, bar-shaped, hoof-shaped, columnar...

2. According to magnetic stability:

permanent magnet

Soft magnet

3. According to the source of magnetism:

natural magnet

artificial magnet

Keywords: Zhejiang Education Edition eighth grade science PPT courseware for the second volume free download, why the compass can point to the direction PPT download, .PPT format;

For more information about the PPT courseware "Why the Compass Can Point to the Direction", please click on the "Why the Compass Can Point to the Direction" ppt tag.

"Why the compass can point the direction" PPT download:

"Why the Compass Points the Direction" PPT Download Part One: Review 1. Magnet: Objects that have the property of attracting ____ are called magnets. 2. Magnetic poles: Any magnet has two magnetic ends. That is, extremes and extremes. 3. Make the original non-magnetic object...

"Why the compass can point the direction" PPT:

"Why the Compass Can Point to the Direction" PPT Part 1 Content: Magnetic Field and Magnetic Magnetic Fields Activity 1: Place a small magnetic needle that originally points north and south around a magnet. What will happen to the small magnetic needle? Question: The magnet does not touch the small magnetic needle, why does the small magnetic needle rotate...

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Update Time: 2024-09-03

This template belongs to science courseware Zhejiang Education Edition Eighth Grade Science Volume 2 industry PPT template

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