Englishfor English speakers
adhesion
Noun
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Adhesion is the ability of a substance to stick to another substance.
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Adhesion is an allegiance to something.
in
Preposition
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Used to show that something is inside something else.
The cat is in the box.
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Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
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Used to show movement towards the inside.
The rain came in through the window.
friction
Noun
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Friction is the resistance that surfaces or objects have when moving over another.
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Friction is the conflict between people that have different ideas or interests.