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0 votes
22.7k views
in Physics by (70.0k points)

To which order do the following levers belong and why? 

(a) A railway signal 

(b) A man cutting bread with a knife 

(c) A boy writing a piece of paper 

(d) A nut cracker 

(e) handle of a water pump 

(f) see-saw 

(g) forceps 

(h) A man rowing a boat 

(i) A lock and key 

(j) Soda water opener 

(k) a door 

(l) motorcarfoot brake 

(m) fishing rod 

(n) lemon squeezer

1 Answer

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Best answer

(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.

 

(c) A boy writing a piece of paper is Illrd order lever as effort is in between load and fulcrum. 

(d) A nut cracker is II nd order lever as load is in between effort and fulcrum.

 

(e) Handle of water pump : 1st order lever as fulcrum is in between effort and load 

(f) See-saw : Lever of 1st order as fulcrum is in between load and effort 

(g) Forceps : Illrd order lever as effort is in between fulcrum and load.

 

(h) A man rowing a boat : End order of lever as load is in between effort and fulcrum 

(i) Bottle Opener : Ilnd order lever as load is in between fulcrum and effort.

 

(j) Soda – water opener : 2nd order lever as load is in between fulcrum and effort. 

(k) A door : Ilnd order lever as load is in between effort and fulcrum. 

(l) Motorcar foot brake : 3 rd order lever as effort is in between load and fulcrum. 

(m) A fishing rod : 3 rd order lever as effort is in between fulcrum and load. 

(n) Lemon squeezer : 2 nd class lever as load is in between fulcrum and effort.

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