Pieces of stone or metal falling from space, made visible for part of their journey due to intense frictional heating.

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After what speed air friction starts to heat up an object?

I understand that air friction cools off an object at low speeds. For example, if you blow on a spoon of hot soup, it cools off. Or if you swing a hot frying pan in the air, it cools off faster. But ...
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5answers
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What are the differences between Comet versus Asteroid versus Meteoroid versus Meteor versus Meteorite?

What are the differences between comet versus asteroid versus meteoroid versus meteor versus meteorite in practical terms?