Assertion: focal ratio | /r/HasProperty | proportional
Facets:
value: inversely
type: MANNER
value: by book
type: OTHER
Source sentences:
text: By Book 1, Proposition 16, Corollary 6 of Newton's Principia, the speed of a body moving along a parabola with a force directed towards the focus is inversely proportional to the square root of the radius.