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And when you have them working in opposing pairs there won't be any rotation, but the force has to go somewhere - you should be able to figure out what the translation would be.
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One minor quibble with this explanation. The phrase "the force has to go somewhere" could be misleading to a new student. For example, if the front wheels are being torqued forward and the rear wheels being torqued backward, the "force goes nowhere". There is no motion. No translation, no turning.
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