Assertion: newton | /r/CapableOf | identify his centrifugal force
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text: Indeed, Huygens too had employed this notion of static force in his Horologium Oscillatorium when he identified his centrifugal force with the tension in the string (or the pressure on a wall) retaining an object in circular motion, in explicit analogy with the tension exerted by a heavy body on a string from which it is dangling.