Motion class 9 physics

KendriyaKendriya vidyalayavidyalaya
baranbaran
name – shashanK gargname – shashanK garg
class – ixclass – ix
subject – sciencesubject – science
(Physics)(Physics)
roll no. – 32roll no. – 32
session – 2018-2019session – 2018-2019

There are two states of anThere are two states of an
object :-object :-
• Rest stateRest state
•Motion stateMotion state

Rest state
If the position of an
object is not changing
with time , then that
object is in rest motion .

Motion state
If the position of an
object changes with time,
then that object is in
motion state .

Scalar Quantities
• The physical quantities which
requires only magnitude to
describe them and there is no need
to direction are known as scalar
quantities .
• Examples :- Distance , speed ,
time , volume , area , density ,
temperature , pressure , etc. .

Vector Quantities
• The quantities which require
direction as well as magnitude
to describe them are known as
Vector Quantities.
• Example :- Displacement ,
velocity , acceleration , force ,
etc. .

Distance
 The length of actual path
travelled by an object is
known as distance covered
by the object .
 It is a scalar quantity .

Displacement
 The shortest distance
travelled between initial
position to final position is
known as Displacement .
 It is a vector quantity .

Speed
 Speed of a body is the
distance travelled by it per
unit time .
 Speed = distance travelled
time taken
 It is a scalar quantity .
 Its unit is m/s .

Velocity
 Velocity of a body is the
distance travelled by it per
unit time in a given direction.
 It is a vector quantity .
 Velocity = displacement/time
 Its unit is m/sec .

Acceleration
 The rate of change of velocity
of an moving object is known
as its Acceleration .
 It is a vector quantity .
 a = final velocity – initial V.
time taken
 Its unit is m/s sq. .

Retardation
 The rate of decreasing
of velocity of a moving
object is known as
retardation .
 It is a vector quantity.

Uniform acceleration motion
A kind of motion in which
velocity of an object
increases in equal amount
in equal time interval
is known as uniform
accelerated motion .

Equation of uniformly
accelerated motion
1. V = U + at
2. S = ut + ½ at * t
3. V*V = U*U + 2 as

Motion class 9 physics

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