Respuesta :
Answer: The work OUTPUT of a simple machine can never exceed the work INPUT because FRICTION uses some of the work.
Explanation:
This concept is related to ideal machines and efficiency.
Only ideal machines can convert all the work input into useful work (work ouput).
The efficiency is a concept that tells you the proportion of input work that is transformed into output work.
Efficiency = (output work / input work) × 100
Ideal machines, those where friction does not exist, have a 100% efficiency, and so ideal machines convert all the input work into useful output work.
Real machines have a efficiency less than 100%. Friction lowers the efficiency and the work outpu is less than the work input, because friction uses work which is converted, mostly, into heat energy or sound energy.
1. Output
2. Input
3. Friction
The work output of a simple machine can never exceed the work input because friction uses some of the work.