
Also known as frictional force, friction force
نیروی مقاومت در برابر حرکت اجسام
Friction is a force that resists movement between two surfaces in contact with each other, causing objects to slow down or stop sliding. It matters because it affects how quickly things move—for example, a surface with more friction will cause an object to slide down more slowly than a surface with less friction.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).