My physics teacher explained to our class the traditional "dropping a magnet through a tube" experiment. As we all know, it slows down and takes longer than usual to fall through. However, he gave us an explanation that I am unsure about. I seem to remember reading about a different explanation...
The force on the rope between the first and second blocks is 5N
And the force on the rope between the second and third blocks is 2N.
I hope that helps
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The difference of electronegativity between iron and oxygen is greater than the one between two oxygens. That means the attraction between iron and oxygen is higher. As a result, the covalent bond between the oxygen ions break and create an ionic bond with iron.