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"Why does the compass point to the direction" PPT download
Part One: Review
1. Magnet: An object that has the property of attracting is called a magnet.
2. Magnetic poles: Any magnet has two magnetic ends. That is - extremely and - extremely.
3. The process of making a non-magnetic object become magnetic is called __________.
(1) After iron is magnetized, its magnetism easily disappears and it is called a soft magnet.
(2) After steel is magnetized, its magnetism can be maintained for a long time and is called a hard magnet or permanent magnet.
4. Tie a thin wire to the middle of a bar magnet and hang it in still air. It can be found that the bar magnet always points in the ________ direction. The N pole of the bar magnet refers to ______ and the S pole refers to _______. .
Why the compass can point to the direction PPT, part 2: experimental exploration
Experiment 1: Let the small magnetic needle stand still on the table, and move the wooden rod and magnet close to the small magnetic needle.
① Let a small magnetic needle stand still on the table, put a wooden rod close to the small magnetic needle, and find that the small magnetic needle ____, explain the role of the small magnetic needle ____ force.
② Put a bar magnet close to the small magnetic needle and find that the small magnetic needle ___________, indicating the role of the small magnetic needle's __________ force.
Conjecture: 1. There may be something around the magnet...
2. There may be things around the magnet...
Why the compass can point to the direction PPT, the third part: magnetic field
1. There are ______ around the magnet.
2. The basic properties of the magnetic field: its effect on the magnet placed in it.
3. The magnetic field has a direction: when the small magnetic needle is stationary, the direction pointed by _________ is the direction of the magnetic field at the point where it is located.
4. At different locations around the magnet, the direction of the magnetic field is ______.
Thinking: Is there any way to display the magnetic field at more points around the bar magnet?
Experimental research: Sprinkle iron filings evenly on a glass plate, place a bar magnet and a horseshoe magnet in the middle, tap the glass plate, and observe the distribution of iron filings around the magnet.
Why the compass can point to the direction PPT, Part 4: Characteristics of magnetic field lines
1. Magnetic field lines are ______ closed curves used to describe magnetic fields. They are actually ______ curves.
2. The magnetic field lines around the magnet always come out from the ______ of the magnet and return to the ______ of the magnet. ("North N" goes out and "South S" goes in)
3. When the small magnetic needle is at rest, the ______ points in the direction of the magnetic field at that point, which is consistent with the ______ direction of the magnetic field lines at that point.
4. The density of magnetic field lines indicates the ______ of the magnetic field.
5. Magnetic field lines are closed and ______ intersecting curves.
Why the compass can point to the direction PPT, Part 5: Geomagnetic field
1. The magnetic field produced by the earth is called the geomagnetic field.
2. The earth is a huge oval magnet (bar magnet).
3. The geomagnetic north pole is near the geographical south pole, and the geomagnetic south pole is near the geographical north pole.
4. The direction of the geomagnetic field is always from the geographical South Pole to the geographical North Pole.
In fact, the earth's north and south poles do not coincide with the geomagnetic north and south poles. The angle between them is called magnetic declination.
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"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...
"Why the compass can point the direction" PPT:
"Why the Compass Can Point to the Direction" PPT Part 1 Content: Magnetic Field and Magnetic Magnetic Fields 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...