📅 NSB 2014🎓 HS🔄 Round 17#️⃣ Q22❓ TOSS-UP✍️ Short Answer
By number rank the following three systems of materials, from lowest to highest, in terms of their coefficients of kinetic friction: 1) rubber on concrete; 2) human joints; 3) ice on ice.
✔️Answer:2, 3, 1
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