Question

explain why a car does not move when the force is applied on it by a person present inside it

Answer 1

When a person applies force on an object, the object is able to move due to the Third Law of Motion, that for every action, there is an equal and opposite reaction. That means the person pushes the ground with his legs and use that reaction force to move the object.
Now, if the person is inside the car, appling force on it manually, the can won't move because the force is applied on the base of car and the reaction force in the forward direction will cancel out being opposite to each other and the car remains stationary.