Hello , I\'m a student and i need some advice regarding learning physics. Ihave

Question

Hello ,
I'm a student and i need some advice regarding learning physics. Ihave a lot of difficulty doing physics problems. When learningphysics, first i read the textbook then do the problems. However,when i get to the problems, i get stuck. I don't know where tobegin. I write down all the givens and the unknowns. I can do thequestions at the beginning, because you just input the unknowns andknowns into the formula and calculate your answer. When i encounterthe more difficult problems i get stuck.
Could you recommend something so that i could get better? I reallylike physics, but have difficulty doing the problems

thanks for any help.

Explanation / Answer

Instead of just plugging numbers into equations, try to think aboutwhat the equations are saying...For example, take Newton's SecondLaw: ? Fon obj. A= mobj. A*aobj. aWhile you might be asked to find the net force on an object of5kg. accelerating at 3m/s, which is pretty easy, you maystruggle when asked to relate Newton's Second Law to Newton's FirstLaw, which states that an object at rest will tend to stay atrest (not accelerate) and will stay at rest unless anunbalanced force acts on it. To do this, we must examine whatNewton's Second Law, or N2 as my teacher calls it, "whispers" tous: N2 says that if the net force acting on the ball is 0 (Fonobj. A= 0N) The product of the mass and acceleration mustalso equal 0. Since mass is constant and not equal to 0 for anyobject, the acceleration must equal 0. Thus, we have derivedNewton's First Law from Newton's Second Law. This is just oneexample of how you can use the numerous numericalequations of physics to answer conceptual questions.

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