When forces on an object are unbalanced, the object will change its motion (speed up, slow down, or change direction).
(forces on an object; are; unbalanced) (the object; will change; its motion; T:When forces on an object are unbalanced) (the object; slow down; )
forces on an object the object the object
are will change slow down
unbalanced
its motion T:When forces on an object are unbalanced