"The Two Poles of a Magnet" Magnet PPT download

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"The Two Poles of a Magnet" Magnet PPT download

Part One: Importing New Knowledge

Do you know what this is?

Does it have any special abilities?

Hoof magnet (U-shaped magnet)

Take a guess

Use different parts of the magnet to attract small steel balls. Do you know what will happen? Let’s try it out!

Describe what you saw and guess what the cause might be?

It is found that the small steel ball runs towards a certain end... The magnetic force of each part of the magnet is different; the magnetic force on both sides of the magnet is strong, and the magnetic force in the middle is weak...

PPT on the two poles of magnets, part 2: new knowledge explanation

1. Which part of the magnet has the strongest magnetic force?

For the convenience of experiment, we use bar magnets to study this problem.

1. Experimental equipment: bar magnet, paper clip

think about it

How many parts should the magnet be divided into and measured?

How to measure the magnetic force of each part?

2. Experimental steps

(1) Pick points: Hang the bar magnet with a wire, and select 4 points on the magnet, namely A, B, C, and D.

(2) Measurement: Hang paper clips under each point, one by one, until you can no longer hang them. Each point was measured three times in succession.

3. Get the number: If 3 data are the same, take this data; if 2 are the same, take the same data; if 3 are not the same, take the medium-sized data.

4. Record: Fill in the measured data on the record sheet.

2. Research on the poles of magnets

1. Do it

Hold two unmarked magnets with both hands and bring their poles toward each other.

How to operate:

1. First mark the two ends of the two magnets with A, B, C, and D respectively, and then bring them close to each other.

2. Use the symbol "→←" to indicate mutual attraction, and use the symbol "←→" to indicate mutual repulsion.

3. Record the results of the experiment.

PPT on the two poles of magnets, part 3: Consolidation exercises

1. The strongest magnetic part of the magnet is called ( ), and each magnet has ( ) magnetic poles.

2. Hold two unmarked magnets with your hands. When the magnetic poles of the two magnets are close to each other, they will sometimes be attracted to each other. We call this phenomenon ( ); sometimes they will be pushed to both sides. We call this phenomenon ( ).

3. Place a small steel ball in the middle of a very strong bar magnet. As shown in the picture, release your hand and the small steel ball will ( ).

A. drop down

B. roll to one end

C. Do not move

4. In the experiment where two unmarked magnets were close to each other, the conclusions of each group of students were different. This is because ().

A. We don't know the names of the two magnetic poles

B. The magnetic poles of magnets change

C. The letters assigned to the magnetic poles by students from each group are not consistent.

PPT on the two poles of magnets, part 4 content: Class summary

1. The part with the strongest magnetic force on the magnet is called the magnetic pole. The magnet has two magnetic poles.

2. Two magnetic poles are close to each other, sometimes repelling each other, sometimes attracting each other; the interaction between the magnetic poles is mutual.

PPT on the two poles of magnets, part 5: writing on the blackboard

poles of magnet

1. What is the magnetic force of a magnet?

1. The strongest magnetic force is at the two poles of the magnet. Each magnet has two magnetic poles.

2. The magnetism is strongest at both ends of the magnet, and the magnetism is weakest in the middle of the magnet.

2. Research on the poles of magnets

Two magnetic poles are close to each other, sometimes repelling each other, sometimes attracting each other; the interaction between the magnetic poles is mutual.

Keywords: Free download of Chinese PPT courseware for the second volume of the third grade of the textbook version, download of the two poles of magnet PPT, download of magnet PPT, .PPT format;

For more information about the PPT courseware "The Two Poles of a Magnet", please click the Magnet ppt The Two Poles of a Magnet ppt tag.

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Update Time: 2024-09-30

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