# HC Verma for Class 11 Physics Chapter 1:Introduction to Physics

Quoting Ken Wilber, "Physics is the most fundamental, and least significant, of the sciences."

The Chapter Introduction to Physics covers all the basic concepts required to obtain an in- depth understanding of the subject. It starts with the definition of linear momentum, which is defined as the product of a system's mass multiplied by its velocity. The formula of linear momentum can be given as p=mv.

Thus, it can be said that linear momentum is directly proportional to the object's mass and velocity. Therefore, angular acceleration can be defined as the time rate of change of the angular velocity. It is usually designated by α and is expressed in radians per second squared.

Torque is a measure of the force that can cause an object to rotate about an axis. Thus, torque is the cause of angular acceleration. In addition, the chapter also consists of simple and easy-to- understand definitions for terms like the electric field, magnetic field, heat capacity and so on.

The International System of Units gives the current form of the metric system. In the CGS system, the units of length, mass and time are centimetre (cm), gram (g) and second (s), respectively. Similarly, in the SI system, the units of length, mass and time are given as meter (m), kilogram (kg) and second (s), respectively.

The chapter, Introduction of physics, further explains the dimensional formula of all terms. The Principle of Homogeneity explains that the dimensions of terms included in a dimensional equation should be the same on both sides. This principle is important as it enables the ease of conversion from one form of the unit to another.

Moreover, dimensional analysis is a basic concept of measurement and has real-time physics applications. There are a few limitations to consider while analysing dimensional formulas. They do not give us any information about:

• 1. The nature of the physical quantity - Scalar or vector.
• 2. Dimensional constant.