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美国高考SATII物理专题分析-SAT II Physics Test-Taking Strategies(1)

美国高考SATII物理专题分析--SAT II Physics Test-Taking Strategies(1)
   All the strategies discussed above can be applied equally to SAT II Physics and SAT II Modern Hebrew. That’s why they’re called “general hints.” However, as you may have noticed, there are a number of differences between the study of physics and the study of modern Hebrew. Because physics is unlike modern Hebrew, and even unlike math and chemistry, there are a number of strategies that apply uniquely to SAT II Physics. Some of these strategies will help you out in physics generally, while some are suited to the unique idiosyncrasies of the SAT II format.
   Physics Hint 1: Know Those Formulas!
   You aren’t allowed to bring a calculator into the SAT II, nor are you allowed to bring in a sheet of paper with useful information on it. That means that if you haven’t memorized formulas like F = ma and   you’re going to lose a lot of points. As we said earlier, 67–80% of the test requires that you know your formulas.
   This doesn’t mean you have to do a lot of rote memorization. As you become more familiar with the principles of physics, you’ll find that the equations that express these principles will become increasingly intuitive. You’ll find patterns: for instance, the force exerted at any point in a field, be it a gravitational field or an electric field, is inversely proportional to r2. That’s why Coulomb’s Law and Newton’s Law of Gravitation look similar. Knowing your physics will help you know your formulas.
   A lot of people feel burdened coming into an exam with lots of formulas and equations in their head. It can feel like your mind is “full,” and there’s no room for the problem solving at hand. If you have trouble remembering formulas, you might want to look them over carefully in the minutes before the test, and then, before you even look at the first question, write down the formulas you have a hard time remembering on the back of the question booklet. That way, you can refer back to them without any painful effort of recollection.
   Physics Hint 2: Estimate
   This hint goes hand in hand with General Hint 5: Know What You’re Being Asked. Don’t dive blindly into five possible answer choices until you know what you’re looking for. The first way to know what you’re looking for is to understand the question properly. Once you understand the question, get a rough sense of what the correct answer should look like.
   Estimation is only useful for questions involving calculation: you can’t “estimate” which Law of Thermodynamics states that the world tends toward increasing disorder. In questions involving a calculation, though, it may save you from foolish errors if you have a sense of the correct order of magnitude. If you’re being asked to calculate the mass of a charging elephant, you can be pretty confident that the answer won’t be 2 kg, which would be far too small, or kg, which would be far too big. Estimation is a good way to eliminate some wrong answers when you’re making an educated guess.