What are devices designed to do work called?

If you apply the law of conservation of energy to simple machines then which of the following is true?

What is a measure of how well a machine converts input work into output work?

What type of lever has the fulcrum on one end and the output on the other end?

What type of simple machine is a sloping surface that allows an object to be raised without lifting it up?

What type of simple machine is a ferris wheel?

What type of simple machine resembles an incline plane wrapping around a rod?

What type of simple machine has a rope or cable that passes over a wheel to keep the force the same or multiply it?

What type of simple machine is a knife?

Can a simple machine lose work input (produce less work that was put in)?

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