instruction:
In this task, you are given a question and answer for that. The answer will fill in the blank or will complete the unfinished question. Your task is to provide an explanation based on the given question or fill-in-the-blank statement, and answer.
question:
Question: If a device were to become less efficient, it would produce _____ usable energy. 
 Answer: less
answer:
The more efficient a device is, the greater the percentage of usable energy it produces.


question:
Question: A hard rock will erode _____ than a soft rock. 
 Answer: slower
answer:
The water erodes the softer rock faster than the harder rock.


question:
Question: Ian wants to have a very weak electrostatic force, so he will make sure that his charged objects are 
 Answer: farther
answer:

The closer the charged objects are, the stronger the electrostatic force.