"Simple Magnetic Phenomenon" Magnetic Phenomenon PPT Courseware 5

Description

"Simple Magnetic Phenomenon" Magnetic Phenomenon PPT Courseware 5

teaching objectives:

1. Through some simple magnetic phenomena, understand concepts such as magnets, magnetic poles, magnetization, and magnetic materials.

2. Experimentally explore the interaction between magnetic poles.

3. Briefly understand magnetic materials and their applications in life.

4. By understanding the achievements made in the study of magnetism in ancient my country, students can enhance their patriotic enthusiasm and further enhance their interest in learning physics.

Teaching focus and difficulties

By observing the experimental demonstration of the interaction between magnetic poles, we can explore the interaction between magnetic poles, initially cultivate students' inquiry ability, and apply this knowledge to solve real life problems.

1: Do magnets only attract iron?

1. Magnet: If an object can attract items made of iron, cobalt, nickel, etc., we say it is magnetic. Objects with magnetic properties are called magnets.

Experiment 2: Do all parts of the magnet have the same ability to attract iron?

2. Magnetic poles: Different parts of a magnet have different magnetic strengths. We call the strongest magnetic parts magnetic poles. There are generally two magnetic poles on the magnet.

Experiment 3: A magnet has two magnetic poles. How to represent these two magnetic poles?

3. When a magnet is able to rotate freely, eventually one magnetic pole will point north and the other magnetic pole will point south.

So people named the two poles of the magnet based on this phenomenon:

South Pole: The end of the guide when the magnet is at rest is called the South Pole (S pole)

North Pole: The end of the magnet pointing north when it is at rest is called the North Pole (N pole)

Experiment 4: The magnetism at both ends of a magnet is the strongest. What will happen if the two magnetic poles are brought close to each other?

4. Interaction between magnetic poles:

Magnetic poles with the same name repel each other and poles with different names attract each other.

Experiment 5: How to make non-magnetic iron nails magnetic?

5. Magnetization: The process of making an originally non-magnetic object magnetic under the influence of a magnet is called magnetization.

Substances that can be magnetized are called magnetic materials. Such as steel, iron, etc.

Some can maintain magnetism for a long time after being magnetized, which we call hard magnetic materials;

Some cannot maintain their magnetism for a long time after magnetization, and we call them soft magnetic materials.

summary:

1. Basic concepts of magnetic phenomena --- magnets and poles

2. Properties of magnets --- Iron attraction and directivity

3. Interaction between magnetic poles;

4. Methods to identify whether an object is magnetic;

Practice questions

1. Magnetic mines use a small magnetic needle that can rotate around an axis to control the detonation circuit. After the warship is magnetized by the geomagnetic field, it becomes a floating magnet. When the warship approaches the magnetic mine, it will cause the mine to explode, such as As shown in the figure, the basis is ____________

2. As shown in the picture, there are three iron blocks hanging in the air. When a and b are close to each other, they attract each other, and when b and c are close to each other, they repel each other. The correct judgment among the following is _______.

A. a must be magnetic

B. b must be magnetic

C. All are magnetic

D. None of the above judgments are correct

3. The small magnetic needle has two magnetic poles. If it is cut into two sections from the middle, then ____.

A. One section is N pole and one section is S pole.

B. Each section has two N poles or two S poles

C. Each section has an N pole and an S pole

D. Each segment has no magnetic poles

4. Two iron rods have the same appearance. Please tell me how to distinguish which one is magnetic and which one is not.

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Update Time: 2024-09-24

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