The weakest of these interactions is gravity, the force which is familiar to us as both the reason why objects fall towards the earth's surface and why the earth and the other planets move in orbits around the sun.
(The weakest of these interactions; is; gravity) (the force; is; familiar to us as both the reason) (objects; fall; towards the earth's surface) (the earth and the other planets; move; in orbits around the sun) (which; is familiar to; us)
The weakest of these interactions the force objects the earth and the other planets which
is is fall move is familiar to
gravity
familiar to us as both the reason
towards the earth's surface
in orbits around the sun
us