Vocabulary words for force and motion any push or pull energy of motion change in one object's position compared to another object's position rate at which an object changes position your point of view combines speed and direction an object is moving the resistance an object has to any change to its motion a force that acts when two surfaces rub together a force that makes objects pull toward each other the ability to move something stored energy the amount of force depends on the mass of an object for every action there is an equal and opposite reaction