Q. A hinged door is an example of which class of lever? Answer:
Second Class Lever
Notes: A door belongs to the second class of levers because its pivot (hinge) is at the end, the load (weight of the door) is at the center, while the effort (opening the door) is applied at the other end. A class 2 lever has the resistance or load in the middle, the fulcrum at one end and the effort at the other.