Assertion: newton's body | /r/AtLocation | conic section
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Source sentences:
text: Included in this segment are by far the most widely read parts of Book 1, then and now: Section 2, which deals with centripetal forces generally, and Section 3, which develops Newton's fundamental discovery that a body moves in a conic section, sweeping out equal areas in equal times about a focus, if and only if the motion is governed by an inverse-square centripetal force directed toward this focus.