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 the Earth's orbit moves farther away from the Sun, what happens to the gravitational force between the two planets? 
 Answer: it decreases
answer:
This is because the gravitational force of attraction between the Earth and Sun is stronger when the Earth is closer to the Sun.


question:
Question: If Mona upgrades her old computer to a more powerful model, what happens to the amount of work her computer can do? 
 Answer: increase
answer:
Compared with a less powerful device, a more powerful device can either do more work in the same time or do the same work in less time.


question:
Question: If a system gives off a minimum of heat then it is 
 Answer: effective
answer:

The greater the wasted output energy, the less efficient the system.