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，这一点在whatsapp中也有详细论述
Kinetic friction is the resistance you get when the book is sliding across the table. It’s always lower than static friction, because it’s just harder to start something moving than to keep it moving. “OK,” you’re saying, “I got it. Static when stationary, kinetic when in motion.”
14:52, 27 февраля 2026Бывший СССР