-- If the force is applied in the same direction as the object is moving, then the object's momentum in that direction will increase.
-- If the force is applied in the direction OPPOSITE to the way the object is moving, then the object's momentum will decrease.
-- In either case, the CHANGE in the object's momentum will be
(strength of the force) x (length of time the force is applied) .
This quantity is also called "impulse".