A thought just sort of popped out presenting a question I'm not sure I've ever answered: An object is in free space with no friction present throughout the surroundings. A person is placed near the object and decides to push the object away from him/her. There is no friction present. What I'm wondering is if the object immediately moves when the force is applied. If the object has a mass and hence, inertia, shouldn't there be some sort of time lag before it started to move?