High School Physics Exam Questions and Solutions, Solving High School Physics Questions

For physics, you should pay attention to the understanding of the concepts in the book, it is recommended to read the physics textbook before class, the effect is very significant, usually pay attention to the way of thinking, thinking strictly and orderly. It's easy to say, but I hope you can realize how to learn physics on your own. Good luck with your studies.

From the ground floor to the second floor, you can see 2N1N2 (N1+N2). Let the number of stairs be n, the speed tolerance of the person is v (i.e., relative to the ladder), and the speed of the elevator is v0, then:

When going up the ladder, for the ground reference frame, the speed of the person is v+v0, when the person reaches the second floor, the displacement of the person relative to the ladder is n1, and the actual displacement of the person is n, then there is an equation: (v+v0) v=n n1, when the person goes down the ladder, the speed difference of the person relative to the ground is v-v0, after reaching the ground, the relative ladder displacement of the person is n2, and the actual displacement n, then there is an equation:

v (v-v0)=n2 n, the two equations are solved simultaneously: v0 v=1-(n n20=(n n1)-1

That is: 2-(n n2)=n n1, the solution of the void. n=2n1n2/(n1+n2)。

Let's look at the formula first, e=i*(r+r).

p=i square * r, deformed to p = (e (r + r)) square * r, the following is to use the number to sell the knowledge, from the equation, r is the independent variable, p is the strain variable, divide r to get p = e square (r + 2r + r square r), when r = r square r, p has a maximum value to call dust, so r = r, p power output is the most central chain front.

First of all, the output power of the white bucket is actually the actual power of the resistance box R, let the circuit current be I, and when the resistance of the electric shock box is R, the maximum output power of the power supply is P, and the following is the column:

i=e/(r+r)

p=i*ir

Get p=(e

r (r+r)2), and p=e(r+(1 r)+2) is obtained by finishing a lead in the spring

From the knowledge of mathematical inequalities, we can know that r+1 r>=2, if and only if r=1 r=1 (r cannot be negative), the denominator of the formula is the smallest, that is, p is the largest at this time, and the solution is p=9w, hope.

In this process, the total work done by the person is: w=gh=mgh=50*10*1=500j, and there is: w=fs, then the thrust of the person is:

f=w/s=500/4=125n

If you directly move the trolley and the goods to do the work, it is also 500j

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The title says that when falling 3 5*h, the kinetic energy of b is equal to the gravitational potential energy. At this time, the gravitational potential energy of b is 2 5*mgh, then the kinetic energy is 2 5*mgh

According to the kinetic energy theorem, f*3 5*h=2 5*mgh-0 gives f=2 3*mg

So the acceleration a=f m=2 3*g

1.First of all, the most important thing to learn physics is to read books, understand the theorems and example problems in the books, and be able to run through the knowledge points in the books to form a system, and the physics exam can be at least 80%.

2.You need to do a lot of questions, so it is recommended that you consider the synchronous practice version of the three-year simulation of the five-year college entrance examination. The questions that I don't know are marked (I usually draw circles on the question number), and the questions that I do wrong are crossed on the question number.

Don't dwell on the questions you don't know for a long time, if you can't think of them in 3 minutes, read the answers, then copy the answers, read the questions and answers again, and then do the next one immediately. When you do the next one, think about whether you can use the previous method.

In this way, after about a month of doing the problem, you can basically solve the problem smoothly, good luck.

First of all, it is necessary to read the questions clearly, which is the minimum requirement for all questions, and it is also the key to success or failure.

Secondly, it is necessary to pay attention to the conditions and hints given by the question, and the general physics problem will not give more conditions, and each condition is useful.

Then, clarify the ideas, and if the topic is large, write it down briefly.

Finally, make the question concisely according to the idea.

Among them, it is necessary to pay more attention to whether there are errors in arithmetic. Make sure that the arithmetic is correct at every step.

This is the general idea of solving physics problems. In fact, it is similar to doing other topics.

When studying physics and other science topics, you should do more and summarize more. It's best to have a notebook to write down what you did wrong and what you can't do, and digest it slowly. In this way, the results will skyrocket!

1.To learn a course well, you must first cultivate your interest in the subject, and with interest, you will have the motivation to learn, and you will not give up easily when you encounter difficulties.

2.For how to solve physics problems, first of all, don't rush to do practice problems, but first read the textbook to understand the derivation method of each principle and formula. Even if you forget the formula when you do the problem, you can push it out yourself.

In particular, don't leave the example questions in the book, you have to understand them, and most of the practice questions in the back can find the shadow of the example questions.

3.Communicate more, including teachers and classmates. If you can't solve the problem that you can't solve by scratching your head, you should ask your teachers and classmates, exchange ideas with them, and you will have unexpected gains.

Take notes after solving the problem, including the idea of solving the problem, the knowledge used, etc.

4.Learn to summarize.

If you want to learn physics well, you just need to improve a little bit every day. I wish you success in your studies!

Write out the relevant formulas, and then deform the formulas into the desired form (not in one step).

One: (1) FN=mg-ft

ft=mg-fn=

FT provides centripetal force for a uniform circular motion.

2）ft=mv²/r

v= √(ft·r/m) =√(2n× =2m/s

Two: (1) t= l v0= (2h g).

g′=2h(v0)²/l²

mg′=gmm/r²

m=g′r²/g

2） gmm/r²=mv²/r

v= (gm r) 'bring m=g r g, g =2h(v0) l into ' v= (g r) = (2h(v0) r l ).

3） gmm/(r+h)²=m4π²(r+h)/t²

t= [4 (r+h) gm] 'bring m=g r g, g =2h(v0) l in', t=[4 (r+h) g r] = [4 (r+h) l 2h(v0) r].

It took me 5min to do the question, and it took me 15min to type, give it points!

Upstairs cow man,For 10 points to work hard.。。。 Knock so many words, admire! The landlord will add 10 points to him, otherwise he will despise you!

1.Conditional, for fill-in-the-blank questions, simple multiple-choice questions, and calculation questions on difficulty.

Laws, formulas, and basic knowledge are directly applied to the conditions and slowly deduced step by step.

This kind of question requires not only a solid grasp of the basics, but also sometimes a certain amount of calculation ability.

2.Questions, multiple-choice questions and simple calculation questions on the upper difficulty.

Multiple-choice questions: For each option, set up formulas one by one, apply theorems and basic knowledge.

Calculation problem: Set a formula according to the problem, apply theorems and basic knowledge to solve it.

This kind of question often does not require high calculation ability, but it is easy to appear "misleading" questions, requiring the ability to use formulas and theorems.

Supplement: For some difficult calculation problems, it is often necessary to take care of the front and back before it is easy to figure out the solution.

In fact, the method of solving the problem is not important.

As long as you have mastered the basic knowledge of physics, you will naturally solve the problem step by step, according to the conditions or problems.

You just need to pay attention to the first priority at all times.

The basic methods of physical problem solving may be more reflected in the multiple-choice questions, such as "elimination method", "limit method", "special value method", "procedure method", "deduction method", "analogy method", etc., but the calculation problems are mainly several major modules of physics, dynamics module, momentum energy module, electromagnetic field module, electromagnetic induction module, they all have relatively fixed solution ideas, you can summarize more.

deductive, analytical; The former is based on known conditions, from physical laws, physical formulas, and according to a certain logic to derive the correct answer; Another approach is to start from the result of the required solution, by.

The method of solving physical problems is actually more conventional, because there are not so many formulas or knowledge points in physics, the main thing is the use of methods, first of all, you have to figure out which knowledge point he really tested in sports, and then combine the known conditions to list equations.

The minimum method first requires you to reconcile, what the previous question asked you to do.

There are two common methods used to solve physics problems:

The characteristic of the analytical method is to start from the quantity to be found, to trace the expression of each quantity in the formula to be sought (of course, in combination with the known quantity given by the question), until the unknown quantity is found. Such a way of thinking "goal-oriented" is a good way.

The law should be mastered proficiently.

The synthesis method is the thinking method of "integrating parts into a whole", which is to clarify the relationship between each part (simple part) and integrate the parts together to obtain the overall solution.

The characteristic of the synthesis method is that it starts with the known quantities and synthesizes the quantities related to each known quantity (which is searched according to the conditions given in the question).

In fact, the "analytical method" and the "synthesis method" are inseparable, the purpose of analysis is synthesis, synthesis should be based on analysis, and the two complement each other.

There are certain steps that should be followed to answer physics questions correctly.

Step 1: Understand the question. The so-called comprehension question refers to whether the phenomenon described in the question is understood.

It's impossible not to understand, what is not understanding? What's the key point you don't understand? This requires concentrating on the "difficult points" and paying attention to the "hidden conditions."

It is necessary to develop such a habit: if you don't understand the problem, don't solve the problem by hand.

If the phenomenon involved in the exercise is complex, there are many objects, there are many rules to be used, and the relationship is complex and hidden, then the exercise should be "broken into parts", and the exercise should be divided into several processes, and each process should be analyzed.

Step 2: On the basis of understanding the problem, write down the rules that should be followed in each process, and then solve the equations composed of each process.

Step 3: Discuss the answers to the exercises Discussion can not only test whether the answers are reasonable, but also enable the reader to gain further understanding and expand their knowledge.

High school physics is a very difficult subject, and he has entered the comprehensive application, and each problem is different for the method of problem solving.