If we add two vectors a, b we get another vector but what if we subtract two vectors of equal magnitude. We will get a vector which have zero magnitude and no direction, this vector is called zero/null vector. There’s no way to determine direction of a zero vector, its directionless. Zero vector is written […]

A Physical Quantity which has magnitude as well as direction is called a Vector Quantity or Vector. Symbol for denoting Vector Quantities are usually written as a letter with an arrow on top pointing towards right or sometimes just bolded letter without an arrow on top. Examples of Vector Quantities are force, velocity, acceleration, momentum […]

Magnitude of Cross or Vector Product of two vectors a and b is defined as multiplication of magnitudes of both vectors and sine of angle between them. Do note that cross or vector product of two vectors is also a vector, hence it will have a direction as well. Direction of this vector can be […]

Dot or Scalar Product of two vectors a and b is defined as multiplication of magnitudes of both vectors and cosine of angle between them. Let’s say that we have two vectors which have magnitudesa = 8b = 3And angle between them is 60°θ = 60° Then their dot or scalar product will be= ab […]

Earlier in other articles, I have talked about what are Physical Quantities in Science. Let me shortly explain again here and then we will be moving into discussing Scalar and Vector quantities. So anything which can be measurement by some instrument is called a Physical Quantity. And it is made up of two things number […]

An object is said to be in Motion if it changes its position with respect to its surroundings with passage of time. For example – A speeding car is in motion because as time passes, its position is changing with respect to its surrounding objects like trees. So key aspect in saying whether an object […]

Dimensions of any physical quantity means the way it is related to fundamental quantities like mass, length and time. These are usually denoted by [M], [L] and [T]. Square brackets are used around capital letter to indicate dimensions. For example – Dimensions of Area is [L2] because Area is defined as length multiplied by length. […]

The branch of science which deals with correct and precise description of the material universe is known as Physics. The word Physics comes from a Greek word meaning “knowledge of nature”. Physics attempts to describe fundamental nature of universe and how it works. For example – Physics explains why the sky is blue, why rainbows […]

This article is specifically for Class 11 students Physics is the physical science which deals with matter, energy and their transformations. Knowledge of physics will help you understand both natural phenomena and technologies that increasingly pervade out lives. There are numberers problems that physics fears. Yet we can describe and understand any problem with the […]

This article is for Class 11 students In doing rough calculations or comparisons, we sometimes round off a number to one or even no significant figures. A number rounded to nearest power of 10 is called order of magnitude. For example – If height of an object is 8 × 103 m, then we can […]