This document summarizes key concepts in physics related to motion, including: - There are two states of an object: rest state and motion state. Rest state is when an object's position is not changing over time, while motion state is when its position changes with time. - Scalar quantities require only a magnitude, while vector quantities require both a magnitude and direction. Examples of each are given. - Distance is the actual path traveled, while displacement is the shortest distance between initial and final positions. Speed is distance over time and is scalar, while velocity includes direction and is a vector. - Acceleration is the rate of change of velocity, and retardation is the decreasing rate of velocity. Uniform acceleration

1. 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

2. motionmotion

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

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

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

6. 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. .

7. 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. .

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

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

10. 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 .

11. 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 .

12. 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. .

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

14. 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 .

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

16. Uniform circular motion

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