Question

For a machine, the input force is 30 N, and the input distance is 2 m. Factoring in the effect of friction, what must be true about the work output? A. It must be less than 60 J. B. It equals 60 J. C. It must be greater than 60 J.

Answer 1

It must be less than 60 J

Since Work input = Effort (input force) × Input distance, and since the efficiency of an actual machine can never be more than 100%, the output force is gotta be less than the input force, that is less than 60 J, and even lesser in this scenario because we are factoring in the non-conservating force - friction.