11. Classify the following simple machines :
(a) A railway signal (b) A door knob
(c) A jack screw (d) A staircase
(e) A bread knife (f) A wheel barrow
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A doorknob is a simple machine that only has two main parts. Six basic types of simple machines exist: the lever, inclined plane, wedge, pulley, screw and the wheel and axle. Of these, the doorknob most closely resembles the wheel and axle. a A railway signals – Lever of 1st order as F is in between load and effort b Cutting a bread with knife is third order lever as effort is in between load and fulcrum.
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