The convex/concave rule states that when a convex surface rotates on a concave surface it will always ___. MCQ 08:08 Biomechanics The convex/concave rule states that when a convex surface rotates on a concave surface it will always ___. a. translate in the opposite direction b. translate in the same direction Answer: translate in the opposite direction Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+