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Khan Academy
Khan Academy: Discovery of Magnetism: Floating Magnet
Can you use a magnet as a compass? How can you find North vs. South pole?
Khan Academy
Khan Academy: Discovery of Magnetism: Compass Interactions
If we float two identically magnetized needles they will always orient themselves in the same way. Why?
Khan Academy
Khan Academy: Discovery of Magnetism
Our ancestors noticed that certain rocks were attracted to each other. They also noticed that this force could be transferred onto certain metallic objects. [1:09]
Khan Academy
Khan Academy: Discovery of Magnetism: Compass Build (Stroke Direction)
An experiment that asks, does the direction that we stroke the needle determine the final orientation of a compass? [1:15]
Khan Academy
Khan Academy: Discovery of Magnetism: Neutralize a Compass
A demonstration of how to neutralize a compass using two needles. Why does this work?
Khan Academy
Khan Academy: Discovery of Magnetism: Compass: Which Way Is North?
How would you know which way is north if you had no reference? Can the direction of stroke alone tell you this? Are you sure? [1:01]
Khan Academy
Khan Academy: Discovery of Magnetism: Compass Build (Magnet Orientation)
When making a compass, does it matter if we stroke the needle with the North vs. South pole of the magnet? Why? [1:07]