class 9th Physics -MOTION

  class 9th science

ICSE/ CBSE Notes-

For more Notes click this link https://cbsenotesallsub.blogspot.com/

MOTION 

a-State of rest

An object is said to be at rest if the position of the object dose not change with respect to fix a point.

That fix point is said to be reference point 

Reference point - A fix point  w.r.t. the position of an object is specified  is known  as reference point or origin

b-State of motion

  The motion is the change in position of an object with respect to its surroundings in a given interval of time. 

 motion  can be described by terms -

  • 1-distance
  • 2-displacement
  • 3-speed
  • 4-velocity
  • 5-time
  • 6-acceleration

  Uniform motion and non-uniform motion

Ø  When an object covers equal distances in equal intervals of time it is in uniform motion.

 

Ø  When an object covers unequal distances in equal intervals of time it is said to be in non-uniform motion.

 Vectors and Scalar Quantities:

1- Those quantities which have both magnitude and direction are called 

vector quantities

eg- displacement ,acceleration,momentum ,torque  etc


2- Those quantities which have only magnitude have no direction are called scalar quantities 

eg- distance , time ,mass, energy etc

·         

 

 Vectors  v/s  Scalar Quantities

Vectors  Quantities

Scalar Quantities

It can be specified by both magnitude and direction

It can be specified by only magnitude

These physical quantities follow the rule of vector algebra

These physical quantities  not follow the rule of vector algebra

Eg  velocity ,force  weight  , momentum  etc

 Eg temperature ,mass, energy  ,density etc

Distance  and  Displacement 


Distance- It is  defined as the length of the actual path  traveled by the body .

It  is a scalar  quantity 

It can never be negative

It is always greater or equal to the displacement in any direction





Displacement-

It is defined  as the shortest distance between the initial and final position of a moving object

Displacement always a straight line  joining  both points

It is a vector quantity

It can be positive , negative and zero

It is always less than or equal to the distance





class 9th force and laws of motion


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