Why can a machine not achieve 100% efficiency in the real world?(1 point)

Question

Responses

The distance over which a small amount of energy is applied increases.
The distance over which a small amount of energy is applied increases.

Output work will always be more than input work.
Output work will always be more than input work.

Machines make the work it takes to do a job harder.
Machines make the work it takes to do a job harder.

Machines must overcome forces of friction.

Answer 1

Machines must overcome forces of friction.