A moment is a moment, and the time interval is the interval between two moments.
For example, 8:00 am is the time, and 8 am to 2 pm is the time interval.
Time refers to an instant, corresponding to a point on the time axis. The points at different times on the time axis are different, and there is a sequence. Time interval is the interval between two moments, which corresponds to a process and reflects the duration of an event.
In mathematics, numbers can be represented by points on a straight line, which is called the number axis. On the number axis, except the number 0 to be represented by the origin, any rational number that is not 0 should be represented. According to the sign of this number, which side of the number axis is located (usually the positive number is on the right side of the origin and the negative number is on the left side of the origin), then determine how many units the number is from the origin in the corresponding direction, and then draw the corresponding point.
Learning physics
1, with strict logical reasoning ability
To learn physics well, we must be able to logically reason and demonstrate physical problems according to the known physical knowledge and physical facts and conditions, so as to draw correct conclusions and judgments and express the reasoning process completely and correctly.
2, analysis and comprehensive ability
It is necessary to be able to independently analyze and study the problems encountered and make clear the physical process, physical state and physical situation.
We should be able to decompose a complex physical problem into several simpler problems and find out the relationship between them.
Can find a solution to the problem and use the knowledge of physics to answer the question comprehensively.
3, the ability to apply mathematical knowledge to deal with physical problems
To learn physics well, we must be able to list the relationship between physical quantities according to specific problems, deduce and solve them reasonably and scientifically, and use various geometric drawings and mathematical images flexibly to analyze and solve them.
Tips for improving physics performance
If you want to learn physics well, you must form the habit of previewing in advance. Be sure to preview carefully before each class, and you can know what you don't understand. Wait until the teacher finishes listening to this part in class.
You must listen carefully in class. You may miss an important knowledge point carelessly. Physical knowledge points are set one by one, so every knowledge point should be listened carefully.
It is very important to review after class. Understanding in class is one thing. If you don't review in time, you will soon forget. It is best for teachers to do the examples they teach in class, so that they can master the knowledge points taught by teachers in class.
A lot of practice is a necessary way to improve physics quickly. You can buy one or two useful exercises to explain, and usually do more of them. If you don't understand, you can refer to them and do it yourself. Doing a lot of questions will make us encounter all kinds of knowledge points, so we should master them carefully.