Magnetic and Gravitational Fields
Students can download this file (forces_and_magnetic fields_2.doc). A second version is also included to see in on line.
This file will give you access to web sites to study the magnetic lines of force, and gravitational fields around the earth.
Magnetic Field Lines (North and South Poles Interacting)
Remember that
1.Magnetic lines always travel from North to South.
2. They do not cross each other and
3. The forces lines are closer to-gether at the end of the magnet showing this is where is strongest.
4. We use the terms North Pole and South Pole to describe the two different ends of a magnet.
5. The shape of the Magnetic Field depends on the shape of the magnet.
6. A compass has a North seeking end which points to the North pole of the earth, however, at the North Geographic pole is a South pole.
Gravitational Field Lines
Remember that
1. That gravity around the earth is always attractive. (If it was able to repel the earth would not stay to-gether and we would not exist!)
2. Gravity depends on the size of the planet, it is different for each planet.
3. As you move away from the planet gravity gets weaker, but it is still strong enough to hold the moon in orbit around the earth. As the moon orbits the earth its also is in a constant SLOW spin, this is why we only ever see one side of the moon.
4. Gravity is much weaker than magnetic force, but if the planet is very large then the gravitational field will also be large.
5. Gravity cannot be turned on or off like a magnet (electromagnet) can.
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ffsites.doc | |
File Size: | 116 kb |
File Type: | doc |
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force_activities.docx | |
File Size: | 13 kb |
File Type: | docx |
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