>>12682967>>12683364The door hinges are the line or axis of
rotation for the door. The closer the door knob is
to the hinges, the more force is required to push
or pull the door (force acts on a tangent from
the door knob about a circle made from the
door's movement). Torque increases if either
the distance from the hinges increases and/or
the force applied increases. Thus, the knobs are
at the edge of the door where we push with
small effort.
See pic related for how it works out.
