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Xu You was gearing up and ready to meet the test questions.

Although it was just a quiz, it was Xu You's first battle after experiencing the state of deep learning.

Xu You really wanted to see what kind of results he had achieved after studying a class.

After receiving the test paper, Xu You took a rough look at it first.

Sure enough, the question types were basically the same as those in the monthly exam just now.

Even some error-prone points in the monthly exam have been carefully integrated into this quiz.

Xu You maintained the state of deep learning and started the mode of answering questions at full speed.

At this time, the get out of class bell rang.

Some students got up and went to the bathroom.

Some students didn't care about what the physics teacher said, so they went to the playground to relax.

Although there are students moving around, the classroom as a whole remains relatively quiet.

After all, it is still an exam, so there must be a minimum of respect.

Except for a few students who are struggling to write.

Most of the students are still confused by the questions on the quiz.

Everyone looked through the previous monthly exam papers, looking for similarities.

Or look at your deskmate to see if they have figured out the topic.

But more, it was just looking at each other at the same table.

This problem can be directly compared by using the law of uniformly variable linear motion.

Dynamic analysis of force balance at a common point, just draw a vector triangle.

It's not exactly the same question type as the monthly exam question, it's just a different number.

Under the state of deep learning, Xu You's answering effect is surprisingly good.

There was basically no resistance to the previous question.

At most, it is just a topic that needs to be calculated, and it takes a little time to calculate.

What Xu You didn't notice was that.

My exaggerated state has already been seen by Dong Chao at the same table.

Xu You...is this a learning demon?

From Dong Chao's perspective, Xu You seemed to be driving at double speed.

Without even looking at the question, he quickly wrote the answer.

It is completely different from Xu You in Dong Chao's impression.

Although Dong Chao's usual grades are worse than Xu You's.

But the speed of solving the questions is faster than Xu You.

Xu You is well-known in the class, and he studies very hard, but there are not so outstanding representatives.

In terms of answering speed, it is also one of the slow ones.

Dong Chao even doubted whether Xu You was writing the answer carelessly.

But when Dong Chao saw the clear process on Xu Youjuan's face.

I also feel that this does not seem to be written casually.

Only ten minutes passed.

Xu You did the last big question.

This big question is obviously more difficult than the previous ones.

Although the question type is similar to the monthly exam questions, there are some changes in it.

This is also the reason why the physics teacher set the standard line of this quiz at 80 points.

For this last big question, it is understandable to lose points.

But for other questions, there is really no reason to lose points.

This is a conveyor belt problem and a difficult point in the mechanics part.

This kind of question compares the independent analysis ability of students.

Even if you have mastered the answering skills, you need to accurately analyze and understand the questions in order to get full marks.

First compare the coefficient of kinetic friction with the tangent value of the inclination angle of the slope, and determine the relationship between the sliding friction force and the downward component of gravity along the slope, so as to determine the acceleration direction of the object.

Xu You didn't feel at a loss because of the change in difficulty of the topic.

Instead, he immediately clarified his thinking and determined the starting point of the topic.

This is also an idea mentioned by the physics teacher in the last class.

In the state of deep learning just now, Xu You has fully understood this idea and kept it in mind.

Soon, Xu You determined the direction of the object's acceleration, and calculated the magnitude of the object's acceleration according to Newton's second law.

The overall topic began to become clearer.

That's how it feels!

Although it was just the beginning, Xu You had already found an excellent feeling for solving problems.

Combine the acceleration value obtained through the knowledge of mechanics into the kinematics formula.

Xu You quickly figured it out, and first asked about the length of the scratches on the conveyor belt.

This first question is not difficult to say.

But if it can be solved proficiently, at least it shows that the students have a good grasp of the basics of movement and force.

You know, just the big questions of movement and strength can already stump more than half of the students.

Xu You was not complacent, but immediately threw himself into the second question.

Find the velocity of the small object when it leaves the conveyor belt.

Simply put, this question is a movement in which the object first decelerates down the conveyor belt and then accelerates in the opposite direction.

As long as the displacement and acceleration are determined, the speed of the small object when it leaves the conveyor belt can be obtained through the formula.

Based on the results of the first question, Xu You first calculated the displacement and the acceleration of the second movement.

Just when Xu You wanted to continue bringing formulas.

Suddenly realized a problem.

No, there is a trap in this question!

That is, the final speed of the small object cannot exceed the speed of the conveyor belt.

If you haven't noticed the problem.

It is very likely to make a fatal mistake and cause the question to lose points.

Such a mistake is the same as the reverse speed of a car after braking. It is very low-level, but it is easy to make mistakes.

The main reason is that students are not proficient in solving problems and their understanding is not thorough enough.

In about twenty minutes, Xu You had finished answering all the questions.

Because Xu You started answering the questions during get out of class time, and now there is still half an hour before the end of the exam.

Seeing that there was still plenty of time, Xu You took a few more minutes to check the roll of paper from beginning to end.

After confirming that all the answers are completely correct.

Xu You decided to go forward and hand in the paper.

Dong Chao at the same table was copying Xu You's answers, but Xu You handed in the paper before he finished half of the copying.

wait……

Dong Chao wanted to extend his hand to keep him, but it was too late.

At this time, Lu Zhiyao also finished answering the paper and got up to hand in the paper.

In the usual quiz, Lu Zhiyao was always the first to hand in the papers.

Not for anything else, just to hand in the papers earlier and do other questions earlier.

It was just a quiz, so naturally Lu Zhiyao would not condescend to check it.

Just when Lu Zhiyao got up to hand in the paper.

But found a figure, already in front of her.

Lu Zhiyao frowned slightly, looked over carefully, and found that this classmate was Xu You.

Lu Zhiyao didn't say a few words to Xu You, and only had a basic understanding of Xu You.

Seeing that it was Xu You, Lu Zhiyao immediately felt relieved.

Xu You is the kind who works hard but learns slowly.

Although Xu You's grades in the class are fairly high.

But in such a short time, Xu You definitely couldn't finish this scroll.

There must be something wrong, and I want to ask the teacher.

Naturally, Lu Zhiyao would not want to compete with other students in such boring things as quizzes.

But if there is someone in the class suddenly, he can answer faster than himself.

Lu Zhiyao still felt a little uncomfortable.