Last Updated：2025/12/19
Sentence
A
doorknob
of
whatever
roundish
shape
is
effectively
a
continuum
of
levers,
with
the
axis
of
the
latching
mechanism—known
as
the
spindle—being
the
fulcrum
about
which
the
turning
takes
place.
Applying
a
force
tangential
to
the
knob
is
essentially
equivalent
to
applying
one
perpendicular
to
a
radial
line
defining
the
lever.
Quizzes for review
A doorknob of whatever roundish shape is effectively a continuum of levers, with the axis of the latching mechanism—known as the spindle—being the fulcrum about which the turning takes place. Applying a force tangential to the knob is essentially equivalent to applying one perpendicular to a radial line defining the lever.
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English - English
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