Which one of the following groups of properties enables the manufacture of chain hooks from wrought iron ?

Ductility, malleability and hardness

Hardness, toughness and ductility

Malleability, ductility and toughness

Hardness, toughness and brittleness

Pulley

Ramp

Bridge

Staircase

The threads increase the input force required

The threads change potential energy to mechanical energy

The threads increase the force over a shorter distance

The threads increase the distance a force is applied

output force is 4 times the effort

effort is 4 times the output force

efficiency is 4%

work output is 4 times the input

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