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Motion

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this is a power point presentation of class 9 physics chapter motion

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Motion

1. 1. MOTION By Agraj Garg Class :- IX – D Roll Number :- 3
2. 2. There are two states of an object • Rest State • Motion State State of Object
3. 3. Rest State If the position of an object is not changing with time , then that object is in rest state.
4. 4. Motion State If the position of an object changes with time, them that object is in motion state or moving state.
5. 5. Scalar Quantities • The physical quantities which requires only magnitude to describe them and there is no need to direction are known as Scalar Quantities. • Example:- Distance ,speed ,time , volume , area, density, work, energy , power , temperature , pressure etc.
6. 6. Vector Quantities • The physical quantities which requires direction as well as magnitude to describe them are known as Vector Quantities. • Example:- Displacement , Velocity , Acceleration , Force, etc.
7. 7. Distance •The length of actual path travelled by an object is known as Distance covered by the object. •It is a scalar quantity.
8. 8. Displacement • The shortest distance travelled between initial point to final point of path travelled by an object is known as Displacement of that object. • It is a Vector quantity.
9. 9. Difference between Distance & Displacement DISTANCE DISPLACEMENT The length of actual path travelled by an object is known as Distance . The shortest distance travelled between initial point to final point of path travelled by an object is known as Displacement . It is a scalar quantity. It is a Vector quantity. It can not be zero. It can be zero.
10. 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. • It’s unit is m/s.
11. 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 Taken • It’s unit is m/sec.
12. 12. Difference between Speed & Velocity SPEED VELOCITY Speed of a body is the distance travelled by it per unit time. Velocity of a body is the distance travelled by it per unit time in a given direction. It is a scalar quantity. It is a vector quantity. It can not be zero. It can be zero.
13. 13. Acceleration • The rate of change of velocity of an moving object is known as its Acceleration. • It is a vector quantity. • Acceleration = Final Velocity – Initial Velocity Time Taken • It’s unit is m/s2.
14. 14. Retardation • The rate of decreasing of velocity of a moving object is known as retardation. •It is also a vector quantity.
15. 15. Uniform Accelerated motion • A kind of motion in which velocity of an object increases in equal amount in equal time intervals is known is uniform accelerated motion.
16. 16. Equation of Uniformly Accelerated Motion 1) v = u + at 2) s = ut + 1/2 at2 1) v2 = u2 + 2as
17. 17. Distance – time Graph • A graph , which shows the distance travelled by an object with time is known as Distance time graph. • The slope of distance-time graph represent the speed of the object.
18. 18. Distance time Graph for uniform speed
19. 19. Distance-time graph for non uniform
20. 20. Velocity – time Graph • A graph , which shows the change in velocity of an object with time is known as Velocity time graph. • The area under the velocity-time graph and time axis represent the displacement of the object.
21. 21. Velocity time graph when the speed remains constant.
22. 22. Velocity time graph for uniform acceleration
23. 23. Velocity time graph for uniform retardation
24. 24. Velocity time graph of a body when its initial speed is not zero
25. 25. Velocity time graph for non uniform acceleration
26. 26. Uniform circular motion • If an object moves in a circular path with uniform speed, then its motion is known as uniform circular motion • Speed of a body moving along a circular path = 2πr t where r =radius t = time taken
27. 27. THANK YOU