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### Motion class 9 physics

• 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
• 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
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