1, Newton's second law, formula: F=ma
F represents the net force (unit: Newton, n) acting on the object, M represents the mass (unit: kg, kg) of the object, and A represents the acceleration (unit: m/s, m/s? )。 According to Newton's second law, when an object receives a net force, it will produce a corresponding acceleration. This means that the force is proportional to the acceleration, and the greater the mass, the greater the force required to produce the same acceleration. At the same time, according to Newton's second law, the mass of an object can also be calculated by the known force and acceleration.
2. Gravity acceleration, formula: g=9.8m/s?
On the surface of the earth, objects are affected by the gravity of the earth. According to Newton's second law, the gravity f of an object with mass m can be expressed as F=mg. According to the formula F=ma of Newton's second law, we can get the acceleration A = G. The speed of an object increases by about 9.8 meters per second.
3. ohm's law, formula: V=IR
Ohm's law points out that when current passes through a resistor, the voltage has a linear relationship with the current, and the resistor is a proportional constant of this relationship. Through ohm's law, as long as two of them are known, the third quantity can be deduced by formula.
Skills of learning college physics well
1, physics is a theoretical science based on basic concepts and principles. At the beginning, students can systematically learn the basic concepts of physics, including mechanics, electromagnetism, optics, heat and so on, through textbooks, classroom explanations and network resources.
2. Physics often uses mathematics as a language to describe and analyze phenomena. Learning physics well requires mastering basic mathematical tools such as algebra, calculus and vector analysis. Make sure you have enough understanding and practice of these mathematical tools, so that you can apply them to physical problems.
The best way to learn physics is to do more exercises and practical problems. Through these exercises, we can deepen our understanding of physical principles and be familiar with how to apply them to practical problems. Find some problem sets or online resources to gradually improve the ability to solve problems.