Question

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 (G A wheelbarrow​

Answer 1

Answer:

a railway signal - lever of second type

a door knob-a simple hinge

a jack screw-a big lever

a staircase-incline plane

a bread knife-lever of third type

awheel barrow-wheel and axile

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Answer 2

Answer:

(a)a railway signal: lever of second order

(b)a door knob:a weel and axel

(c)a Jack screw :a screw

(d)a staircase :inclinid plane

(e)a bread knife :lever of third order

(f)a wheelbarrow:a lever of second order