Force - a push or a pull on an object that causes a change in motion of the object Friction - a force that occurs between surfaces that are in contact with each other.
(an object; causes; a change in motion of the object) (a force; occurs; L:between surfaces) (surfaces; are; in contact with each other)
an object a force surfaces
causes occurs are
a change in motion of the object
L:between surfaces
in contact with each other