Zhejiang Education Edition Eighth Grade Science Volume 2

Description

"Why the compass can point the direction" PPT

Part One: Magnetic Field and Magnetic Field Lines

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?

The small magnetic needle is affected by the magnetic force in the magnetic field

Activity 2. Place glass or paper between the magnet and the iron block and observe whether the magnet can attract the iron block.

Conclusion: Magnetic fields can penetrate objects

Activity 3. Observe the number of pins attracted by the magnet when it is far away from the pins and when it is close to the pins.

in conclusion:

1. The magnetic field can magnetize iron, cobalt and other substances in the magnetic field into magnets.

2. There are strong and weak magnetic fields. If you are close to the magnet, the magnetic field is strong; if you are far from the magnet, the magnetic field is weak.

Why does the compass point to the direction PPT, Part 2: Classroom Thoughts

Thinking: What are the characteristics of the distribution of magnetic field lines?

(1) The magnetic field lines all come out from the N pole of the magnet and return to the S pole.

(2) Magnetic field lines will not intersect.

(3) The magnetic field is strong where the magnetic field lines are dense and weak where the magnetic field lines are sparse.

Can you draw the direction of the magnetic field at point a in the magnetic field? Place a small magnetic needle at point b. In what direction will the small magnetic needle point when it is at rest?

A compass is a small magnetic needle. Its north pole points to the north and its south pole points to the south. What does this mean?

The small magnetic needle's north pole points to the magnetic field's south pole.

The south pole of the small magnetic needle points to the north pole of the magnetic field

Why the compass can point to the direction PPT, Part 3: Practice

1. Magnetic field lines can vividly and conveniently represent the _____ directions of points around the magnet. The magnetic field lines around the magnet all come out from the _____ pole of the magnet and return to the _____ pole of the magnet.

2. The earth itself is a huge magnet. The geomagnetic south pole is near the geographical _____ pole.

3. There is a stationary iron block on the horizontal table. When the bar magnet gradually approaches the iron block in the vertical direction, the pressure of the iron block on the table will be _____, and the gravity on the iron block will be _____. (Select "get bigger", "get smaller" or "unchange")

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

"Why can the compass point to the direction" PPT courseware Part 1: Question thinking [Thinking] Why can the 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: has...

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Update Time: 2024-10-01

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