Levers

all of these levers don't conserve energy except ------

• nutceacker

• ice holder

• fishing tool

• hockey bat

which of the follwing levers is used to avoid dangers ?

• coal holder

• scissors

• seasaw

• manual broom

the opposite figure represents the ---- class lever

• third

• first

• second

the effort force is between the resistance and the fulcrum

• first class lever

• second class lever

• third class lever

• b and c

GR : wheelbarrow is a seccond class lever

GR : Nutcracker save efforts

when the effort arm equals 5 cm and th resistance arm equals 10 cm then

• the type of lever may be first class lever

• the type of lever may be third class lever

• a and b

when the length of force arm equals 2.5 meters and the length of the resistance arm equals 1.5 meters so,

• the rsisitance force larger than the effort force

• the lever has a mechanical benefit

• the levers save efforts.

• all the above

answer :