"Will the size of magnetism change?" Magnet PPT download

Description

"Will the size of magnetism change?" Magnet PPT download

Part One: Importing New Knowledge

The magnetic force of a magnet is constant.

Is there any way you can change the magnetic force of a magnet?

If two magnets or many ring magnets are attracted to each other and overlapped, will the magnetic force change?

If the magnitude of the magnetic force changes, will it become larger or smaller?

Today we will study this issue together.

Will the size of magnetism change? PPT, part 2: new knowledge explanation

1. The magnetic force of magnets

To know whether the mutual attraction of two magnets or many ring magnets is enhanced, you must first know the magnetic force of a magnet.

Do you have any good way to measure the magnetic force of a magnet?

When two magnets are drawn together, the magnetic force may increase.

If you continue to attract the magnet, the magnetic force may continue to increase;

2. Measure magnetism and collect data

Thinking and discussion: How can we know whether our ideas are correct?

Use experimental methods to observe the number of paper clips attracted by the magnet.

Experimental steps:

1. Place the ring magnet on the ruler;

2. Hang a paper clip hook under the ring magnet;

3. Remove the small hook and hang the paper clip on the small hook;

4. Hang the small hook with the paper clip on it under the ring magnet;

5. Record the experimental data until the magnet cannot hold the paper clip.

Kind tips

(1) During the experiment, stack the ring magnets upward in sequence

(2) Working in a group, one person will listen, another person will write down, and the other members will observe and count.

(3) Repeat the experiment 3 times, keep records of the experiment, and pack away the materials after the experiment is completed.

Will the size of magnetism change? PPT, Part 3: Consolidation exercises

1. The magnetic force of the same magnet is ( ). If two or more ring magnets are attracted together, the magnetic force will be ( ). When two magnets that repel each other are brought together, the magnetic force will be ( ).

2. After two mutually repelling magnets are glued together, the magnetic force of the magnets will be ( ).

A. increase

B. decrease

C. unchanged

3. What method do we use to measure and compare changes in magnetic force in experiments? ( )

A. Expressed by the number of nails attracted by the magnet;

B. Use the magnet to attract the number of paper clips to represent it;

C. Use a magnet to attract iron through objects of different thicknesses.

4. In the experiment to study changes in magnetic force, when we measure the magnetic force of different numbers of magnets, at least how many experiments do we need to do? ( )

A. Only once

B. At least 2 times

C. At least three times

Will the size of magnetism change? PPT, Part 4: Class Summary

1. Attach another magnet to a ring magnet, and the magnetic force will increase; continue to attach the magnet, and the magnetic force will continue to increase;

2. When two mutually repelling magnets are combined, the magnetic force will decrease;

Keywords: free download of Chinese PPT courseware for the second volume of the third grade of the textbook version, does the size of the magnet change PPT download, magnet PPT download, .PPT format;

For more information about the PPT courseware "Will the magnetic force of a magnet change?", please click the "Will the magnetic force of a magnet change?" ppt tag.

"Magnetic Force of Electromagnets (2)" Energy PPT Download:

"Magnetic Force of Electromagnets (2)" Energy PPT Download Part One: Review Introduction An electromagnet is a device composed of a coil and an iron core. The magnetic force of the electromagnet is related to the number of coil turns: the greater the number of coil turns, the greater the magnetic force, and the smaller the number of coil turns..

"Magnetic Force of Electromagnets (2)" Energy PPT:

"Magnetic Force of Electromagnets (2)" Energy PPT Part One Content: The group tests the selected hypothesis and formulates a group research plan. What are the factors we want to examine (i.e. the conditions that need to be changed)? How to change this condition? For the sake of fairness in the experiment, it should be controlled...

"Magnetic Force of Electromagnets (1)" Energy PPT teaching courseware:

"The Magnetic Force of Electromagnets (1)" Energy PPT Teaching Courseware Part One: Introduction of the new lesson Why the magnetic force of electromagnets is different and what factors affect the magnetic force of electromagnets. In today's lesson we will learn about the magnetic force of electromagnets. ... ... ... electromagnetism..

File Info

Update Time: 2024-11-03

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

Preview