1. In physical, F=MA, it is the principle of force and mass and acceleration.
2. but in the real world, it is not true. why?
3. because F=MA is assume a pure world, and only one items without any other things exist.
4. in real world, there is always other factors here which make F=MA not true. E.g. friction, which make F > MA in real world.
5. the more factors existing in the real world, the principle become inaccurate or even false in some special condition.
6. some people like to find out the pure principle, equation of the "pure world".
7. but some like to focus on the "real world" and how these factors affecting the principle because it is more accurate to understand the real world.
8. from a survival perspective, you cannot live only rely on pure principle.
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