For example, if a wheel is on a hill, it can maintain its energy and momentum whether, or not, it rolls down the hill.
(a wheel; is; on a hill) (it; can maintain; its energy and momentum whether, or not; T:whether, or not, it rolls down the hill) (it; rolls; down the hill)
a wheel it it
is can maintain rolls
on a hill
its energy and momentum whether, or not T:whether, or not, it rolls down the hill
down the hill