I'm not sure what you're asking here.
A screw is the most efficient.
false A+
They are less so eAsier
because they are not proper
Any mechanical action will waste energy as heat, therefore the work output is always less than the enegry input.
Some energy is lost to friction.
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Steam driven machines are extremely non efficient. Gasoline machines are'nt much better
becaus ethey have friction
the relationship between them is that the machines have friction that makes the machine goes
It is not costly It is easier to use It is more efficient It is user friendly
Because they are faster than using a needle and thread, and they are very efficient.