Initial velocity Vo = 0；; Terminal speed Vt = gt falling height h=gt2/2 (calculated downward from Vo position); Inference Vt2 = 2gh；; Displacement s=Vot-gt2/22. The final speed vt = VO-gt (g = 9.8m/S2 ≈10m/S2); Useful inference VT2-VO2 =-2gs; Maximum rising reading, Hm=Vo2/2g (from the throwing point).
Introduction to physics:
Physics is a subject that studies the most common laws of motion and the basic structure of matter. Physics, as the leading discipline of natural science, studies the most basic motion forms and laws of all substances from the universe to elementary particles, so it has become the research basis of other natural science disciplines.
Physics began in the era of Galileo and Newton, and now it has become a basic science with many branches. Physics is an experimental science, and it is also a science that advocates rationality and attaches importance to logical reasoning. Physics, which makes full use of mathematics as its working language, is the most accurate natural science subject today. 202 1, China's physical natural index ranks first in the world.
Research areas:
1. condensed matter physics-studies the macroscopic properties of matter, which contains a large number of components and has strong interaction among them. The most familiar condensed phases are solids and liquids, which are formed by bonds between atoms and electromagnetic forces. More condensed phases include superfluids and Bose-Einstein condensed states (found in some atomic systems with very low temperatures).
Superconducting phases of conducting electrons in some materials: ferromagnetic and antiferromagnetic phases in atomic lattice. Condensed matter physics has always been the biggest research field. Historically, it originated from solid state physics. 1967 was first put forward by philip anderson and adopted this name.
2. Atomic, molecular and optical physics-the study of substance-substance and light-substance interactions within the scope of atomic size or several atomic structures. These three areas are closely related. Because they use similar methods and related energy levels. They all include classical and quantum processing methods.
Deal with problems from a micro perspective. Atomic physics studies the shell of atoms, focusing on the quantum control of atoms and ions; Cooling and trapping; Low temperature collision dynamics: accurate measurement of basic constants; Collective effect of electrons in structural dynamics. Atomic physics is influenced by the nucleus. However, nuclear phenomena such as nuclear division and nuclear synthesis belong to high-energy physics.
Molecular physics focuses on polyatomic structure and its interaction with matter and light. Optical physics here only studies the basic characteristics of light and the interaction between light and matter in the microscopic field.