Differences

# DIFFERENCES BETWEEN MASS AND WEIGHT PARAMETER Definition

MASS Is the matter contained in the body

WEIGHT Is the force with which it is attracted towards the centre of the earth

Physical quantity

Scalar quantity

Vector quantity

Measurement SI unit

Measured by using beam balance Kilogram ‘kg’

By using spring balance. Newton ‘N’

Variation in value

Is constant and does not change from place to place.

Is not constant and varies with the value of ‘g’ from place to place.

Zero value

Cannot be zero at any place

Becomes zero when the body is taken to the center of the gravity i.e. when ‘g’=0

Nature

Is the measure of body’s inertia

Is the gravitational force

# DIFFERNCES BETWEEN ‘G’ AND ‘g’ PARAMETER

Acceleration due to gravity ‘g’

SI unit

Universal gravitational constant ‘G It is equal to the force of attraction acting between two bodies each of unit mass , whose centers are placed a t a unit distance Nm2/ kg2

Numeric value

6.67 x 10 -11 N m2/ kg2

9.8 m/s2

Variation

Same at all the places

VALUE CHANGES – with change in shape of the earth, altitude and depth.

Zero value quantity

NEVER ZERO Scalar

Zero at the centre of the earth. vector

Definition

It is the uniform acceleration produced in a body when it falls freely under the effect of gravity. m/s2

# DIFFERNCES BETWEEN GRAVITATION AND GRAVITY PARAMETER Definition

GRAVITATION Any two objects in the universe attract each other by a force called gravitation.

GRAVITY It is a special case of gravitation in which one of the two bodies happens to be earth. The force of gravitation exerted by the earth is called gravity.

Magnitude of force

Forces involved are very small

Forces involved are very large.

Motion

Two attracting bodies do not move towards each other. Produces almost negligible acceleration It is not the measure of the weight

Body pulls towards the earth,

Acceleration weight

Causes the body to accelerate at 9.8 m/s2 Gravity acts on mass and gives weight Weight= mass x gravity W=m x g

# DIFFERENCE BERWEEN BALANCED AND UN BALANCED FORCES PARARMETER

BALANCED FORCES

UNBALANCED FORCES

State of rest

Does not change the state of rest, the body continue to at rest.

Changes the state of rest

State of motion

Does not change the state of motion, i.e. if the body moves with constant velocity, it will continue to move with same velocity.

Can bring about change in the state of motion of a body, i.e. can make rest body move.

Acceleration

Do not produce acceleration. They make the body move with constant velocity, hence ha no acceleration.

Any body moving with constant speed gets accelerated or decelerated due to the action of unbalanced forces.

Change

Can change the shape of body, but not the direction of the body

Can change the shape and direction of the body.

Resultant force

The resultant of all the forces acting on the body is zero

The resultant of all the forces acting on the body is not zero.

# DIFFERNCE BETWEEN VELOCITY AND ACCELERATION PARARMETER

VELOCITY

ACCELERTION

Definition

Is distance traveled by the body per unit time in a definite direction

Rate if change of velocity of a body per unit time.

formulae

Velocity= displacement/ time

Acceleration= change in velocity / time taken to change

Zero value

When the body is not moving , its value is zero

Direction of motion

The direction of velocity decides the direction of motion For example , when the ball is thrown upwards, then the direction of motion of the ball and velocity is same.

SI unit

m/s

When the body is moving with constant velocity , its acceleration is zero. It does not decide the direction of motion. For example, when the ball is thrown vertically upwards, then the direction of motion of the ball is upwards but acceleration due to gravity acts downwards towards the earth. m/s2

# DIFEFRNCE BETWEEN ACCLERATION AND RETARDATION PARAMETER

ACCELERATION

RETARDATION

DEFINITION

If the velocity of the body increases, then the rate of velocity is positive and is called acceleration A body falling freely from a certain height has positive acceleration of 9.8 m /s2

If the velocity of the body decreases, then the rate of velocity is negative and is called retardation If a body is thrown upwards , its velocity decreases and has a retardation of 9.8 m /s2

Final velocity is greater than

Final velocity is lesser than

Example

Relation

initial velocity v > u initial velocity v < u # DIFFERNCE BETWEEN DISTANCE AND DISPLACEMENT PARAMETER

DISTANCE

DISPLACEMENT

Definition

Actual path traveled by a moving body , irrespective of the direction in which the body ids traveling

Shortest distance measured between the initial and final positions of a moving body in a particular direction.

Physical quantity

Scalar

Vector

Value

Always positive , can never be zero or negative

May be positive, negative or zero

Dependence on path

Depends on the path that it follows

Does not depend on the path followed by the moving body

Magnitude

Magnitude is always greater than or equal to the displacement

Always less or equal to the distance

# DIFFERNCE BETWEEN SPEED AND VELOCITY PARAMETER

SPEED

VELOCITY

Definition

Is the distance traveled by the body per unit time

Is the distance traveled by the body per unit time in a specified direction

Physical quantity

Scalar quantity

Vector quantity

Value

Always positive

Always negative

Formulae

Speed = distance traveled / time taken

Velocity= displacement / time taken