How to make the bell inverted with a triangular rotating body in the hood with junior high school ph

There is no distinction between arts and sciences in junior high school, and there will be no distinction between arts and sciences in high school this year.

Junior high school physics is the most basic, but physics itself belongs to science.

Physics is a science and engineering subject, and junior high school physics is the same. . .

It's okay, it's basic common sense anyway.

The current situation is that physics is better, in fact, physics and mathematics are relatively scarce majors, and each middle school recruits people to recruit these two subjects, but as you said, mathematics seems to take a long time, and most people think so, so there are fewer physics.

interest. In fact, mathematics is the foundation of physics, and it is also the foundation of all science, so mathematics has always run through the entire learning career, but the importance of physics in modern science is self-evident, if you want to look at it in the long run, it depends on which aspect your ambition is more preferred, in terms of employment, I feel that physics is better.

The colors of the flowers are white, yellow, pink, red, purple-red, purple, dark purple (black), snow blue (powder blue), green, and compound color; Male pistils often have petalization, and the natural increase of petals and the degree of petalization of males and pistils are related to the variety, cultivation environmental conditions, and growth years. Most of the stamens of normal flowers, strong seed-setting ability, seed maturity is also high, pistil petalization of serious flowers, less seeds and not fruit or no seeds, complete flower stamens are separated, carpels are generally 5, rarely 8, each has a bottle-shaped ovary a room, marginal placenta, most ovules, bone fruit pentagonal, each fruit horn bears 7 13 seeds, the seeds are round, when ripe, it is a total yellow, and when it is old, it becomes black-brown, the diameter of mature seeds is centimeters, and the weight of 1,000 seeds is about 400 grams.

The moment the rope is straightened, m1 pulls m2 and both have the same velocity, at this time m3 is not involved;

Brought in by the conservation of momentum m1v=m1v'+m2v' has v'=8;(without the unit); That's its maximum speed.

Assuming that the wooden block does not fall.

The minimum speed of the trailer is that all three have the same speed;

m1v=(m1+m2+m3)v2

So v2=6

The force on m3 is a= g= (g takes 10);

2as=vt^2-v0^2 v0=0

So solve s=2

Just not to fall.

First of all, I only said that there is a trolley, and I didn't say where the trailer is, and then I said the maximum speed of the trailer, please make the topic clearer first.

There are no good magazines for middle school physics, they are all about pediatrics. Scientific phenomena are not explained, the exercises are too simple, it is recommended that you buy "Read and Use" plus a physics journal with deep content, the current physics journal is easy to understand, basically there are not too many formulas. It's completely understandable.

In junior high school, students who should master the basic knowledge of physics should give them some difficult questions or materials to do and cultivate them slowly.

The main thing is to think more and think thoroughly.