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Posted by on Jul 13, 2016 in Critical Thinking Skills |

Take a close look at the two screws below. Suppose they were both turned in a counter clockwise rotation…

Take a close look at the two screws below. Suppose they were both turned in a counter clockwise rotation. What will happen to each screw?

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Two_Screws

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Answer: The threads of screw (A) form a spiral that would GO INTO the wood block. In contrast, the opposite spiral of screw (B) would result in this screw moving out of the wooden block.