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"Be a Compass" magnet PPT download
Part One: Importing New Knowledge
Knowledge Review: Do you know what parts a compass is made of?
It consists of four parts: magnetic needle, azimuth plate, bracket and box.
The compass can help us identify the direction and is our good friend. Do you want to own a compass yourself?
Today I will teach students how to make a simple compass.
Make a compass PPT, part 2: new knowledge explanation
1. Make a compass
Thinking and discussion: 1. What problems do we need to solve to make a simple compass?
Thought and discussion 2: What materials do we need to make a compass?
Strong magnets, steel needles, blow molded paper, thread, scissors, small sink, box compass.
Thought and discussion 3: What material are sewing needles made of? Can sewing needles absorb iron?
Sewing needles are made of iron material, and sewing needles cannot absorb iron.
2. Make magnetic needles
How to make a magnetic needle? Guess how to make the magnetic force of the steel needle stronger?
Make a magnetic needle by rubbing a magnet against a steel needle.
It is definitely better to rub the steel needle with a strong magnet.
The more you rub it, the stronger the magnet may be.
2. Install the magnetic needle
How to make the magnetic needle rotate freely in the horizontal direction?
Method 1: Place the magnetic needle on a stand and easily rotate it along the vertical axis or hang it horizontally in the air with a thin wire so that it can rotate freely;
Method 2: Make the magnetic needle float on the water and rotate freely in the horizontal direction.
Insert the magnetic needle into the foam and place it in the water to become a compass.
Work in groups to create various compasses
(1) Select materials according to the plan and pay attention to economy;
(2) Division of labor and collaboration are both more efficient than safe;
(3) Pay attention to debugging and ensure reliable quality;
Make a compass PPT, part three: consolidation exercises
1. When making your own compass, use a magnet to rub the sewing needle in the direction.
2. The methods used in the laboratory to make the magnetic needle rotate freely in the horizontal direction include the antique compass style——————,——————,——————.
3. To make a compass, you can use steel needles, iron nails, etc. Use the magnetic poles of the magnet to rub the steel needle (or iron nail) in one direction. Repeat ——————, and then mark —————— .
4. Make a compass. The most important thing is ( )
A. Be sure to make an orientation plate
B. Let the magnetic needle rotate freely
C. Make a protective shell for the magnetic needle
Make a compass PPT, part 4: Class summary
1. Make a magnetic needle: Use the magnetic pole of the magnet to rub the steel needle in one direction, and repeat this 20 to 30 times.
2. Method to enable the magnetic needle to rotate freely in the horizontal direction:
Method 1: Place the magnetic needle on a stand, or hang it horizontally in the air with a thin wire.
Method 2: Make the magnetic needle float on the water.
3. The form of homemade compass: boat form, antique compass type, hanging type, hanging box type
Keywords: Free download of Chinese PPT courseware for the second volume of the third grade of the textbook version, Make a Compass PPT download, Magnet PPT download, .PPT format;
For more information about the "Magnet Makes a Compass" PPT courseware, please click the Magnet PPT Makes a Compass PPT tab.
"Be a Compass" Magnet PPT:
"Make a Compass" Magnet PPT Part One Content: Making Magnetic Needles People have long discovered that iron nails and steel needles sometimes become magnetic after being contacted or rubbed by magnets. They also found that steel needles are stronger than iron nails and iron needles when they are also rubbed with magnets. The film has stronger magnetism. People are...
"Be a Compass" Magnet PPT Courseware 2:
"Make a Compass" Magnet PPT Courseware 2 Review: 1. The compass is one of the four great inventions of ancient China. What is the name of the earliest compass in the world? 2. What parts does a compass consist of? What are the functions of each? 3. How to use the compass correctly? think..
"Be a Compass" magnet PPT courseware:
"Make a Compass" Magnet PPT Courseware 1. Round magnets generally do not have magnetic poles marked. If the right side of it is attracted to the N pole of the magnet bar, which pole is the right side of the circular magnet? ⒉Place the tip of the magnet rod close to the stationary north needle, and turn the pointer to down...