# Use of units in physics

Introduction about physics and studying the subject This article is mainly about use of units in physics. But before going further let us first discuss about how to avoid problems that students face while studying physics. When you study physics you must have appropriate skills or you would have to struggle a lot while studying the subject. In my experience students fail to learn physics … Continue reading Use of units in physics »

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# Relative velocity

Before discussing relative velocity we must know that all the motion is relative. Everything moves-even things that appear to be at rest. They move relative to the Sun and stars. When we discuss the motion of something, we describe the motion relative to something else. When we say a racing car reaches a speed of 200 kilometers per hour, we mean relative to the track. Unless stated otherwise, when we discuss the speeds of things in our environment, we mean relative to the surface of Earth. Motion is relative.

# Free problems and solutions in physics – OLP 2012-13

We have added problems along with solutions for following chapters in physics in our website http://physicscatalyst.com.

whether you are a class 11 , class 12 student preparing for your board exams or you are a student preparing for various competitive exams you will benefit from these questions and gain knowledge on subject.

# How to find the force if you know the potential energy

For one dimensional motion, the force can be found from Potential energy using following formula

# H.C Verma Concepts of physics OR NCERT physics books

Many times i have had users ask me a question which book to opt between H.C Verma Concepts of physics and NCERT physics books. My answer is you can keep both the books set for your preparation as NCERT is nice book to learn a good concepts and is according to the exam level of class 11 and class 12.

# CBSE Class 11 mathematics syllabus

UNIT-I: SETS AND FUNCTIONS
1. Sets : (12) Periods
Sets and their representations. Empty set. Finite & Infinite sets. Equal sets.Subsets. Subsets
of the set of real numbers especially intervals (with notations). Power set. Universal set.
Venn diagrams. Union and Intersection of sets. Difference of sets. Complement of a set.
Properties of Complement Sets.

# CBSE Class 11 physics syllabus

Unit I: Physical World and Measurement (Periods 10)
Physics: Scope and excitement; nature of physical laws; Physics, technology and society.
Need for measurement: Units of measurement; systems of units; SI units, fundamental and derived
units. Length, mass and time measurements; accuracy and precision of measuring instruments; errors in
measurement; significant figures.
Dimensions of physical quantities, dimensional analysis and its applications.

# Complex Numbers

Complex numbers are the numbers of the form a+ib where a and b are real numbers.

Definition:- Complex numbers are defined as an ordered pair of real numbers like (x,y) where

z=(x,y)=x+iy

and both x and y are real numbers and x is known as real part of complex number and y is known as imaginary part of the complex number.