"Be a Compass" Magnet PPT Courseware 2

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"Be a Compass" Magnet PPT Courseware 2

review:

1. The compass is one of the four great inventions of ancient China. What is the name of the earliest compass in the world?

2. What parts does a compass consist of? What are the functions of each?

3. How to use a compass correctly?

Think: What materials are needed to make a compass?

1. Magnetic needle: indicates the north-south direction.

2. Directional indicator plate: determine each direction.

3. Bracket: enables the magnetic needle to rotate freely.

4. Outer box: plays a protective role.

Make a magnetic needle

1. Use a magnet to rub the steel needle in one direction 20-30 times

2. Check whether the steel needle becomes a magnet and how many pins it can attract.

3. Use your own method to determine the North and South Pole

4. Use your own method to mark the North and South Pole

Install the magnetic needle, use your brain, design your own compass, and work together to complete it.

Think about it:

1. How to make the magnetic needle rotate freely?

2. How to express the south pole and north pole of the magnetic needle?

3. After installing the magnetic needle, check and adjust it to see if it can indicate the direction.

Determine the North and South Pole?

method one

Let the magnetic needle rotate freely horizontally and see its position at rest.

Basis: When a magnet is at rest, it can point to the north direction.

Method Two

Take the pole (S) of a magnet and slowly approach one end of the small magnetic needle.

Basis: When two magnets are close to each other, like poles repel each other and opposite poles attract each other.

The little judge "gives a verdict"

1. Rubbing a steel needle with a magnet has stronger magnetism than rubbing an iron nail or iron piece ( )

2. The plastic pen holder can be made into a magnet through friction ( )

3. The small magnetic needle can only indicate the direction when it can rotate freely ( )

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For more information about the "Magnet Makes a Compass" PPT courseware, please click the Magnet ppt makes a compass ppt tag.

"Be a Compass" magnet PPT download:

"Make a Compass" Magnet PPT Download Part One: Introduction of New Knowledge Knowledge Review: Do you know what parts a compass is made of? It consists of four parts: magnetic needle, azimuth plate, bracket and box. The compass can help us identify the direction and is our good friend..

"Be a Compass" Magnet PPT:

"Make a Compass" Magnet PPT Part One Content: Making Magnetic Needles People have long discovered that iron nails and steel needles sometimes become magnetic after being contacted or rubbed by magnets. They also found that steel needles are stronger than iron nails and iron needles when they are also rubbed with magnets. The film has stronger magnetism. People are...

"Be a Compass" magnet PPT courseware:

"Make a Compass" Magnet PPT Courseware 1. Round magnets generally do not have magnetic poles marked. If the right side of it is attracted to the N pole of the magnet bar, which pole is the right side of the circular magnet? ⒉Place the tip of the magnet rod close to the stationary north needle, and turn the pointer to down...

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Update Time: 2024-09-03

This template belongs to science courseware Third Grade Science Volume 2, Textbook Edition industry PPT template

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