What is the primary advantage of using heuristics rather than algorithms in solving problems? what is the primary disadvantage?

The primary advantage of using heuristics rather than algorithms in solving problems is that it can get you an answer much faster when you use logic, assuming you are dealing with a common situation. An advantage is that primary data is information the researcher has collected and worked with personally. It relates directly to that person's research or study. A disadvantage of primary data is that it is expensive to collect the data, and it often takes a long time to process the information.

Gravitational force i believe