Vectors

Vectors

So friends let's start the first topic of Physics of Class 11 that is Vector.

I will break this chapter into sub topics for better understanding:

• Introduction
• Types of Vector
• Representation of Vectors
• Addition of Vectors Geometrically
• Vectors on x-y co-ordinates
• Components of Vector
• Addition of Vector using components
• Multiplication of Vectors
• Dot Product and Cross Product

So let's get started!

Introduction

Vectors are physical quantities which requires magnitude as well as the direction for its representation. For example, we can not simply write 10m Displacement because it does not signifies the direction. So we have to write 10m Displacement in East direction.

Current is also represented with direction and magnitude but it's not a Vector Quantity. Since the vector quantities must follow the rules of Vector Triangle. This we will discuss in the next topic.

Representation of Vectors

Vectors are represented with an alphabet and a line above it indicates its direction. The line above it should be proportional to the magnitude.

For example,

F=20N
It is written as

The length of the line above is proportional to magnitude of F. So if there is 1cm=10N
then the above arrow should be 2 cm long