How can I do the physical calculation? I can't set the formula. What should I do I have been studying physics for nearly two years, and I don't know how to do it

How can I do the physical calculation? I can't set the formula. What should I do I have been studying physics for nearly two years, and I don't know how to do it

In fact, physics is very simple, the most important thing is to understand, not to memorize the formula, but to understand the formula, to determine the object of study, and the research process, what is known, you have a clear understanding of this, the formula will naturally emerge. Generally from three aspects, one is mechanics, that is, force analysis, followed by motion, and the third is energy