Materials:
Wheelbarrow
Sugar tongs
Pair of scissors
Air bellows
Paper cutter
Tin opener
Pair of compasses
Nut cracker
Claw hammer
Crocodile clip
Law of Levers: The product of
effort and effort-arm is the same as the product of load and load-arm.
There are three types of levers, depending on the relative positions of the effort (E),
fulcrum (F) and load (L).
The first-class lever has F between E and L e.g. balance and see-saw.
The second-class lever has L between F and E e.g. while rowing a boat the ends of
The oars are points where the effort is applied, the row-locks are points where the load
is and the pivotal points of the oars (the ends in water) are the fulcrum .
The third-class lever has E between F and L e.g. while sweeping, the end of the broom
nearest you is the fulcrum, the force which you apply near the fulcrum is the effort and
the load is at the far end of the broom.
Label the levers shown in Fig explaining how you classify them in the three
types. Work with as many actual pieces as possible.
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