Tuesday, August 31, 2010

Types of waves

TYPES OF WAVES: -
In this blog we are going to discuss about types of waves.Below types of waves and its types.
To know about physics concept  reflection see Light Reflection.
What is wave?

Wave is a kerfuffle produced in a line due to the repeated vibrations of the particles of the occupation, around their construction business.

Waves are broadly secret as: -

1) Longitudinal waves
2) Transversal Waves

1) Longitudinal waves
A reservist, which propagates along the direction of atmosphere of the particles of the transmission, is called longitudinal twist.
Wholesome waves are longitudinal in nature.
The regions where the molecules amount fireman are titled compressions.
The regions where the molecules displace separated are called rarefactions.
That is longitudinal waves move in the conformation of compressions and rarefactions.

2) Transverse movement
A reservist, which propagates in a route perpendicular to the content of undulation of the particles of the occupation, is titled transversal waving.
Electromagnetic waves and vibrations in a advance of a string are transverse in nature.
The elevated portion

Next time we will see more about it.

Velocity Equation



                             VELOCITY EQUATION
In this blog we are going to discuss about one physics topic velocity equation.Also see the given link to know about average velocity.

Velocity: -

It is the speed in a particular direction.

Velocity of the wind is equal to 200 kilometers per hour northeast.

Velocity is a vector quantity.

Velocity has magnitude as well as direction.

The SI Unit of velocity is metre per second.

Since velocity is a vector quantity it can be negative.

Velocity Equation: -

Velocity of sound waves can be determined,

According to echo method, velocity equation is

Velocity of sound = 2d/t

i. e. V=2d/t

Where,
          d =distance between the source of sound and the obstacle, which produces echo.
          t=time taken.
          2d=the distance traveled as the sound waves travel to and fro.
This just a small concept on velocity equation,now try to get more knowledge on this concept.
Next time we will discuss about types of waves,as it is also a important concept in physics.

Also take physics tuition with tutorvista as this is the online tutoring company who provides good tutoring to the students all over the world and also see the link tutorvista reviews.
There you will get to know about tutorvista online tutoring.




Monday, August 30, 2010

Different Types Of Waves


In this blog we are going to discuss about different types of waves.
Wave is a stir produced in a        
transmission due to the repeated vibrations of the particles of the psychic, around their equipoise situation.

Waves are broadly grouped as: -

Longitudinal waves
 Transverse Waves

Crosswise waves propagate in the work of crests and troughs.
Whereas
In a longitudinal motion the particles of the occupation vacillate antiparallel to the path of propagation of the twist.
But in transverse woman particles of the psychic sway perpendicular to the instruction of spreading of the woman.
The longitudinal curve propagates in the constitute of compressions and rarefactions.
The transverse undulation propagates in the taxon of crests and troughs.
In the housing of longitudinal gesticulate condensation and a rarefaction comprise one motion.
In crosswise curve a top and one incurvation make one gesticulate.

This is just a introduction of to different types of waves.Next time we will discuss about another physics topics light reflection.
Also for any science help we can go for online science help.

Thursday, August 26, 2010

Free Physics Help

Improvement of communication help online or online tutoring to gained a lot importance as it benefits. Difference is that in Online help the student and tutor does not meet head to head but meets through multimedia devices with the help of net service.
  In Online help the scholars can meet the teachers through net and tutors can report and clear the doubts of the scholars like tutors do in the traditional process of tutoring. Here the things can be cleared through e-meeting.
 If free online help is given in the subject phusics then it is called online free physics help.

BENEFITS OF PHYSICS HELP ONLINE: - 
Physics Home work Helper helps the scholars in their every day home work. As soon as the student submits his home work a teacher joins him and they help him in doing his home work through multimedia devices like Webcams, Microphone, and Headset etc with the help of net service. 
These services 24 round the clock and students can solve their issue through live online chat and emails. 


These services are available for students al over the world. So, students can receive this service from anywhere in the globe. 

Subject specialists are provided to students for helping them in their home work So, every idea is cleared and explicated well. 

It can help in the clearing of the doubts which sometimes stay unlearned in the class. This helps the student to be much advance in the class and do better in his examination.

 This service can assist the student to do his home work in time and they will be much confident in the class as each and every idea will be cleared by the home work helpe

 They provide high quality service, complete the assignments exactly which assist the scholars to do their work more effectively.
Like that student can get help of every subjects like free pre algebra help,free calculus help,free geometry help etc..... 

Monday, August 23, 2010

Define Matter


Here in this blog wev are going to discuss about one physics topic define matter.
Matter can exist in various phases: solid, liquid, gas, or plasma. Most substances can transition between these phases based on the amount of heat the material absorbs

Matter can be identified by certain properties or behaviour. 
Balloons, football and orange juice are all examples of matter having certain properties.
Matter is an entity that takes up space and occupies it. The amount of space occupied by any matter is called its volume.
Watch the difference in the levels of the pans of the weighing scale shown here
The inflated balloon has air in it and is therefore heavier than the deflated one.

Air is matter and matter has weight.
Observe that the ice sinks down by the force of the juice that’s being poured.
The force exerted by matter is called its pressure

Matter can be identified by certain characters, like it has weight ,occupies space and exerts pressure.
This all about what is matter. But along with the matter definition you should know the various types of matter.
Next blog we will learn more about this concept along with some examples.

Wednesday, August 18, 2010

Types of forces


Types of forces
In this blog we are going to learn about types of forces very briefly.
When you lift something, push something, or otherwise manipulate an object, you are exerting a force. A force is defined practically as a push or a pull—essentially it’s what makes things move. A force is called vector quantity, as which has both a magnitude and a direction.
We can divide force into two types:
 Contact Forces and Non contact Forces

Contact Forces:

The forces which act on bodies when they are in actual contact are called the contact forces.
a)Frictional Forces:When a body is slided over a rough surface,a force acts on the body parallel to the surface in direction opposite to the motion of the body.This is called the frictional force.
like,a book placed on the table top is pushed to the right,the force of friction acts on the book towards the left.this force resists the motion of book on the rough surface.
b)Normal reaction force:When a body is placed on a surface,the body exerts a force on the surface,but the body does not move.This is because the surface exerts an equal and opposite force on the body normal to the surface which is called the normal reaction force.
c)Tension force as applied through strings:When a body is suspended by a string,the body pulls the string vertically downwards due to its weight W and the string pulls the body upwards by a force which balances the weight of the body. This force is called the tension force T.
d)Force exerted by a spring:A spring in its original form does not exert any force on the object attached to its end.A compressed spring pushes away the object attached at its end,while a stretched spring pulls in the object attached at its end.
Thus,keeping one end of the spring fixed if its other end id displaced, the spring exerts a force which is directly proportional to the displacement of spring and it is in direction opposite to the direction of displacement.This force is called the restoring force.
e)Force exerted during collision:When two bodies collide,equal and opposite forces act on each body which make them to move apart after the collision.
f)Force applied as a pull or push:When a body is pushed or pulled.its get displaced.

Non-contact Forces:

The forces which act on bodies without being physically touched,are called the non-contact forces.
a)Gravitational force:The force due to the pull of gravity is called the gravitational force.It causes motion in the body downward.It is the gravitational force due to which a body released from a height,falls down.
Example:A ball placed on a table starts rolling down when the table is tilted.
b)Electrostatic Force:The force between the two point charges placed at a separation is called the electrostatic force.Two like charges repel,while the unlike charges attract each other.
c)Magnetic force:The force between the two magnetic poles placed at a separation is called magnetic force.Two like poles repel,while the unlike poles attract each other.
This is all about forces and  types of forces definition.I believed that you got an idea on it So,next tme we will discuss more about it..

Light eflection


In this blog we are going to learn  about light reflection.But before that do you know what is reflection?

Reflection is the change in direction of a wave at an interface which makes it return to the original medium.this was discovered by a scientist.
Types of Reflection
there are two types of light  Reflection specular reflection and diffuse reflection.

 Regular reflection is one of the perfect, mirror-like reflection of light.
In this type of reflection the reflected rays are also parallel to each other.

Reflection in  mirror,  water surface and highly polished floors, are examples of regular reflections.

Mirror
Any smooth polished surface which can reflect most of the light incident on it is called mirror or reflecting surface

Incident ray
The ray of light which strikes the reflecting surface is called the incident ray.
 AB is the incident ray

Point of incidence
The point on the reflecting surface at which a ray of light strikes is called the point of incidence. B is point of the incidence

Reflected ray
The ray of light which bounces back into the same medium after reflection from the reflecting surface is called the reflected ray.
Normal
The perpendicular drawn to the surface at the point of incidence is called the normal.

Angle of incidence
The angle which the incident ray makes with the normal at the point of incidence is called angle of incidence.

Angle of reflection
The angle which the reflected ray makes with the normal at the point of incidence is called the angle of reflection. .
Next time we will learn more about this concept.

Tuesday, August 17, 2010

Adding vectors



In this blog we are going to learn about one mathematical concept adding vector.But do you know how to define vector?
A vector is a mathematical concept that has both a magnitude and direction. It is often represented in variable form in bold face with an arrow above it. Many quantities in physics are vector quantities.
The process of adding two or more than two vectors is called 'addition or composition of vectors' or adding vectors.
There are three types of  law for adding  vector and what condition they work.
Triangle law of vectors
If two vectors are represented  magnitude and direction by the two sides of a triangle taken in the same order, then the resultant is represented completely, in magnitude and direction, by the third side of the triangle taken in the opposite order.
This law is used for the addition of two vectors.
Parallelogram law of vectors
If two vectors, act simultaneously at a point, can be represented  in magnitude and direction by the two adjacent sides of a parallelogram drawn from a point, then the resultant is represented completely  in magnitude and direction by the diagonal of the parallelogram passing through that point.”
This statement is known as parallelogram law of vectors.
Polygon law of vectors
If a number of vector could be represented both in magnitude and direction by the sides of an open convex polygon taken in the same order, then the resultant is represented completely in magnitude and direction by the closing side of the polygon, taken in the opposite order."
This is just a small concept of vector .We have other concept like subtracting vector,multification of vector,and dividing vector.Next blog we will learn more about about these above mention vectors.I believed you got this concept.

Inertia Examples



In this blog we are going to discuss about a physics topic Inertia. Do you know what is inertia?Here I am going to give you the inertia definition with inertia examples. 
There is a glass tumbler placed on a table over which is placed a card board
Now place a coin on the card board
The tumbler, the card board and the coin are all at rest
Now flick the card board. What do you observe?
You will notice that the coin falls vertically downwards

Observe that the coin does not move with the cardboard
However the coin falls downwards due to force of gravity
The coin does not move with the card board because of the property of matter called inertia

Inertia is the inability of a body to change by itself either the state of rest or of uniform motion along a straight line unless an external force is applied on it

Now let me give you another inertia example.
Here you can see the passengers in the bus leaning backward when the bus suddenly starts moving.
Why does this happen?
This is because the upper part of the body of the passengers continues to be at rest while the lower part starts moving along with the bus due to inertia
Similarly when a moving bus stops suddenly, the passengers will fall forward.
I believed that you get the concept  on this topic.Next blog we will discuss more about it.

Monday, August 16, 2010

Longitudinal waves


Longitudinal waves:

In this blog we are going to learn about one of the types of wave which is Longitudinal waves. But before that
What is wave?
Wave is a disturbance produced in a medium due to the repeated vibrations of the particles of the medium, about their equilibrium position.

Waves are broadly classified as: -

1) Longitudinal waves

1) Longitudinal waves
A wave, which propagates along the direction of vibration of the particles of the medium, is called longitudinal wave.
Sound waves are longitudinal in nature.
The regions where the molecules come closer are called compressions.
The regions where the molecules move apart are called rarefactions.
That is longitudinal waves propagate in the form of compressions and rarefactions. 
See the figure of Longitudinal waves to understand the concept better. Next time we will learn another types of waves Transverse Waves and its behavior with some examples and diagrams.I belived that you got this concept.

Sunday, August 15, 2010

TYPES OF WAVES



TYPES OF WAVES: -
 In this blog we are mainly going to discuss about a physics topics types of waves.You everybody know about wave.So,here i am going to discuss about its types.
Wave is a disturbance produced in a medium due to the repeated vibrations of the particles of the medium, about their equilibrium position.

There are mainly two types of waves that we are boardly find:

1) Longitudinal waves

1) Longitudinal waves
A wave, which propagates along the direction of vibration of the particles of the medium, is called longitudinal wave.
Sound waves are longitudinal in nature.
The regions where the molecules come closer are called compressions.
The regions where the molecules move apart are called rarefactions.
That is longitudinal waves propagate in the form of compressions and rarefactions.

2) Transverse wave
A wave, which propagates in a direction perpendicular to the direction of vibration of the particles of the medium, is called transverse wave.
Electromagnetic waves and vibrations in a string of a violin are transverse in nature.
The elevated portions of the string are called the crests and the depressed portions are called the troughs.

Next time we will learn the difference between these two waves and how it works.

Saturday, August 14, 2010

What is reflection


What is reflection:
In this blog we are going to learn about two interesting  physics topics what is Reflection and light reflection.
     Reflection is the change in direction (position) of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated.Reflection follow some laws.they are:
1.     The incident and the reflected ray and then normal to the reflection surface at the point of the incidence lie in the same plane.
2.     The angle which the incident ray (i) makes with the normal is equal to the given angle which the reflected ray makes to the same normal.
3.     Light paths are reversible.
 
Now come to the next topic light reflection.
Reflection of light can be further classified as specular reflection and diffuse reflection.

Specular reflection is the perfect, mirror-like reflection of light.
In this type of reflection the reflected rays are also parallel to each other

Diffuse reflection is uniform reflection of light with no directional dependence for the viewer, e.g., a matte surface such as cardboard.

Next blog we will discuss more about various kind of reflection.

Thursday, August 12, 2010

What is matter


What is matter?
In this blog we are goin g to discuss about two Physics topics one is What is matter and other is Kinetic Energy.
Now let me start with What is matter?
Matter is everything that is around us.
Anything that has an existence, due to which one is able to see and feel it directly, is called matter.

Matter can be identified by certain properties or behaviour. 
Balloons, football and orange juice are all examples of matter having certain properties.
Matter is an entity that takes up space and occupies it. The amount of space occupied by any matter is called its volume.
Watch the difference in the levels of the pans of the weighing scale shown here
The inflated balloon has air in it and is therefore heavier than the deflated one.

Air is matter and matter has weight.
Observe that the ice sinks down by the force of the juice that’s being poured.
The force exerted by matter is called its pressure

Matter can be identified by certain properties: -

Matter is anything that
1) Has weight.
2) Occupies space and
3) Exerts pressure.
Now come to the next concept what is kinetics energy?
Energy is the ability or capacity to do work. Every matter of the universe, whether living or non living, human being, animals or plants posses some type of energy in one way or the other.Kinetic energy s a form of energy which is related to the motion of the particle.If a body is at rest then its kinetic energy will be zero.
Lets see some examples of kinetic energy-
A moving train,water falling from high rocks,a walking  man,a moving rocket ete.
So,energy consists of a moving thing is Kinetic energy.
We will discuss more about Kinetic energy in the next blog.

Wavelength formula



Wavelength formula:
In this blog we are going to learn about a physics topic Wavelength formula.So,here I am going to give a little introduction of wave length and wave length formula.But along with this formula we should know about Wave length calculator.
Now let’s begin with wave and wave length formula-
Wavelength is nothing but the distance between the crest and crest in a wave or the distance between the depression and trough in a wave. Crest is the peak of the wave and trough is the low dip of the wave. It is denoted as the symbol of λ..T he distance among two successive points on a wave is called wavelength.
Here is the wave length formula.
λ = v / f
λ (lambda) = wavelength in feet.
V = velocity of propagation in feet per second.
f be the frequency into the HZ.
Conversion of frequency to wavelength:-
f = v / λ
Conversion of wavelength to frequency:-
λ = v / f.
Next time we are going to learn about using this formula how we can solve problems on wave length.

Wednesday, August 11, 2010

Moment of Inertia Rectangle

Moment of Inertia Rectangle:


 In this blog we are going to learn Moment of Inertia Rectangle.But before that we should know the Inertia difinition  .
Inertia is the inability of a body to change by itself either the state of rest or of uniform motion along a straight line unless an external force is applied on it.
Now let's dicuss about moment of inertia and Moment of Inertia Rectangle.I believe that this concept will halp you to understand moment of inertia cylinder concept also.

You can see a wheel and a uniform disc with the same mass rotating about a same axis.
Why is it difficult to start or stop the wheel than to start or stop the disc even though both of them have same mass?

This is because the force required to start or stop an object undergoing rotational motion depends on the product of the mass of the object and the square of the distance from the axis of rotation to the particles which make up the body.
The product of mass and square of the distance from the axis of rotation is greater in the case of a wheel.

This explains why it is difficult to start or stop a wheel. 
The product of mass of the particle and the square of the distance of the particle from the axis of rotation gives the moment of inertia.

Moment of inertia of a body = m1r1 + m2r2 + ……….+ mnrn.Where m1,  m2……….mn are the masses of the particles constituting the object and r1, r2……..rn are the distances of these particles from the axis of rotation. (To be read as - m1r1 + m2r2 till mnrn)
The equation can also be written as
Where m is the mass of the particle and r is the distance of the particle from the axis of rotation.
The SI unit of moment of inertia is kilogram meter squared and the dimensional formula is ML2.
The moment of inertia of a rectangle shape such as this one is easily calculated by using the equation I = 1/12 bh3.
Using this equation we can solve  inertia of a rectangular problems.
 

Inertia Definition


 In this blog we are going to learn about how to define inertia.

I don't know much about inertia definition ,but i believe that this discussion will help you to know inertia definition better.

And one more thing if  you understood this concept than it will help you to more inertia ralated concept like moment of inertia cylinder,moment of inertia rectangle etc.but first of all we should learn understood this difinition.


There is a glass tumbler placed on a table over which is placed a card board
Now place a coin on the card board
The tumbler, the card board and the coin are all at rest
Now flick the card board. What do you observe?
You will notice that the coin falls vertically downwards

Observe that the coin does not move with the cardboard
However the coin falls downwards due to force of gravity
The coin does not move with the card board because of the property of matter called inertia

Inertia is the inability of a body to change by itself either the state of rest or of uniform motion along a straight line unless an external force is applied on it

Now let us understand inertia with the help of another example.
Here you can see the passengers in the bus leaning backward when the bus suddenly starts moving.
Why does this happen?
This is because the upper part of the body of the passengers continues to be at rest while the lower part starts moving along with the bus due to inertia
Similarly when a moving bus stops suddenly, the passengers will fall forward.

Tuesday, August 10, 2010

Adding Vectors


vectors' or adding vectors.
In this blog we are going to learn about adding vectors and addition of vectors.
When two or more than two vectors are added, we get a single vector called the resultant vector.
The resultant of two or more than two vectors is a single vector which produces the same effect as the individual vectors together produce.

Three laws have been evolved for the addition of vectors.
They are
1) Triangle law of vectors
2) Parallelogram law of vectors
3) Polygon law of vectors

Triangle law of vectors

If two vectors are represented both in magnitude and direction by the two sides of a triangle taken in the same order, then the resultant is represented completely, both in magnitude and direction, by the third side of the triangle taken in the opposite order.
This law is used for the addition of two vectors.

Parallelogram law of vectors

If two vectors, acting simultaneously at a point, can be represented both in magnitude and direction by the two adjacent sides of a parallelogram drawn from a point, then the resultant is represented completely both in magnitude and direction by the diagonal of the parallelogram passing through that point.”
This statement is known as parallelogram law of vectors.

Polygon law of vectors

If a number of vectors can be represented both in magnitude and direction by the sides of an open convex polygon taken in the same order, then the resultant is represented completely in magnitude and direction by the closing side of the polygon, taken in the opposite order."

Vector quantity


Vector quantity: -

What is a physical quantity?
Any quantity that can be measured is a physical quantity.
Physical quantities are classified as vectors and scalars
The physical quantities, which require only magnitude for their complete specification, are called scalars or scalar quantity.
They can be added up based on ordinary rules of algebra.
Quantities such as mass, temperature, speed, time, density, etc., are scalars.
Consider a freely falling body under the action of gravity.
Here the motion of the body is one-dimensional and hence the distance traveled in a given time is a scalar.
The motion of the coins on a carom board is two-dimensional.
Similarly when a spacecraft moves in space the motion will be three-dimensional. Here the concept of direction becomes more primal.
Now there is a need to define a quantity, which has both magnitude and direction.
Such quantities are referred to as vectors or vector quantities.
Velocity, acceleration, weight, force, momentum, etc., are vectors.

Representation of vectors: -
A vector is represented by a straight line with an arrowhead.
The length of the line is equal to or proportional to the magnitude of the vector and the arrowhead shows the direction.

Types of vectors: -
Vectors can be classified as-
collinear vectors
co-initial vectors
negative vectors
zero or null vectors
position vectors

Wave Motion



Motion wave


In Physics term wave motion is nothing but a process by which a disturbance at one point is propagated to another point more remote from the source with no net transport of the material of the medium itself. Waves can take many forms, but there are two fundamental types of waves: “longitudinal” and “transverse” Both of these wave-types are traveling disturbances, but they are different because of the way that they travel.

 When the particles of a medium vibrate in a direction at right angles to the direction of propagation of the disturbance through the medium, the waves set up in the medium are called  transverse waves.
When the particles of a medium vibrate in the direction of propagation of the disturbance through the medium, the waves set up in the medium are called longitudinal waves.Now let's learn something about types of motion  and parts of wave in this blog.
Look at the above figure first one is representing  Transverse Wave and second figure representing longitudinal waves.








Acceleration Formula


What is Acceleration?

The time-rate of change of velocity is called acceleration. Acceleration is a vector quantity which is defined as "the rate at which an object changes its velocity.” Issac Newton is credited as the Founding formula of acceleration. He was the 1st scientist to determine that all moving objects had its own acceleration.
Acceleration is described as the change in velocity over time. It is a vector quantity, acceleration is the rate at which the velocity changes. In general term, acceleration is used for an increase in velocity and a decrease in velocity is known as deceleration.
Let’s see the Acceleration Formula-
a = (vf – vi)/ t (Acceleration is designated by ‘a’.)
 We everybody know that Acceleration,Force and Velocity ,these all are related to one another.So lets get some knowledge on Formula for Force and Formula for Velocity.

Take an Example on Acceleration formula:
If a train moved at final velocity of  31 m/s and if it took  20 seconds to reach the final velocity from the standing point,than what is the acceleration  speed of the train?
a=vf-vi/t
a=31m/s -0 m/s/20 sec(divided by)
a= 1.55 m/s2

This is how  using Acceleration Formula we can solved problems.

Monday, August 9, 2010

Milliliters to Liters

Milliliters to Liters
In this blog we are going to learn abut what is Milliliter and liter and also some solution to calculate milliliters to liters.
Milliliter is also a very little portion of liter.Liter is a unit of volume and milliliter is a small size of it.Example-1000 milliliters is equal to 1 liter.We can say that milliliter is a unit of volume equal to one thousandth (10 -3) of a liter.And in a word liter is nothing but a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard condition.( equal to 1,000 cubic centimeters)..Now let's learn how to solve problems on Grams to liters and liters to milliliters
Now let’s solve a problem how to calculate Milliliters to Liters:
What is 201 milliliters in liters?
Solution:
Step 1:
Formula for converting milliliter to liters
1milliliter= 0.001 liters
Step 2:
Find the given milliliter.
1milliliter= 0.001 liters
Therefore 201 milliliters:
Multiplied by 201 for both sides
Step 3:
We get 201 milliliter = 0.201 liters
Step 4:
Hence 201 milliliter is equal to 0.201 liters
This is how we can solve miliiliters to liters problems..

What is Physics

What is Physics?
Have you ever been thought How we see picture in television?How we talk with our mobile phone to our friends?How a airplane fly?How did universe begin? If you think about these questions than you have learn Physics.
The word 'Physics' comes from the Greek word 'phusis' meaning 'nature', introduced by the ancient scientist 'Aristotle'. Man has always been fascinated by nature. So, he questioned and sought answers for every phenomena nature could offer. The branch of science which is devoted to the study of nature and natural phenomena is called Physics.
We can divide Physics into two types –
Classical Physics and Modern Physics.
Classical Physics includes subjects like-Mechanics, Thermodynamics, Electromagnetism, and Optics .
In modern Physics we find –Relativity, Quantum mechanics.
Physics is not a single subject.It has a relation with every part of the science subjects.Physics has a relation with Chemistry,Astronomy,Mathematics,Biological science etc.
Physics also deeply related to human and society.
Lets learn more what is Physics and its relation to the every scope of human life and science

Unit Vector


Unit vector: -
Vector is a quantity which has magnitude as well as direction. Vectors can have the magnitude 1, 2, 3.

Unit vector is a vector which has the magnitude 1 or unit.

A line of given length and pointing towards a given direction, like an arrow, is the typical representation

A vector can be made Unit vector by dividing it by its length.

Any vector can be represented by providing its magnitude but a unit vector along its direction.


The process of adding vectors (two or more than two) is called 'addition or composition of vectors'.
When two or more than two unit vectors are added, we get a single vector called the resultant vector.
The resultant of two or more than two vectors is a single vector which produces the same effect as the individual vectors together produce.

Three laws have been evolved for the addition of vectors.
They are: -
1) Triangle law of vectors
2) Parallelogram law of vectors
3) Polygon law of vectors