A small amount of this is due to the force of friction on the surface, but most of the resistance is caused by the work required to move the air or water out of the way.
(A small amount of this; is; due to the force of friction on the surface) (most of the resistance; is caused; by the work) (the work; required; to move the air or water out of the way)
A small amount of this most of the resistance the work
is is caused required
due to the force of friction on the surface
by the work
to move the air or water out of the way