Class 9th Physics Unit 2 Kinematics

physics 9th notes Chapter No 2

1. Study of motion of the bodies is known as

 
 
 
 

2. If the speed and direction of the moving body does not change with time then its velocity is said to be:

 
 
 
 

3. The motion of the string of a violin is

 
 
 
 

4. When a body moves to and fro about a point and repeats its motion again and again about the same point then this motion is known as:

 
 
 
 

5. If the velocity of the body is increasing then its acceleration will be:

 
 
 
 

6. In equations of motion, Acceleration will always be:

 
 
 
 

7. If a body changes its position with respect to some observer then it will be in state of:

 
 
 
 

8. 54 kmh⁻¹ into ms⁻¹

 
 
 
 

9. If a body is thrown vertically upward then its final velocity will be:

 
 
 
 

10. If a body is falling under the gravity then its initial velocity will be:

 
 
 
 

11. Rest and motion are states:

 
 
 
 

12. SI unit of speed is:

 
 
 
 

13. If the velocity of the body is decreasing then its acceleration will be:

 
 
 
 

14. If the speed or direction of the moving body changes with time then its velocity is said to be:

 
 
 
 

15. If a body covers equal distance in equal intervals of time, however small the intervals may be, then the speed of the body is known as:

 
 
 
 

16. Total length of a path between two points is known as:

 
 
 
 

17. Value of g depends on:

 
 
 
 

18. The spinning motion of individual particles of top is known as

 
 
 
 

19. In equations of motion, motion will always be taken along ______ line:

 
 
 
 

20. The slope of straight line in distance time graph gives the magnitude of: 

 
 
 
 

21. Equations of motion are:

 
 
 
 

22. Rate of change of velocity is known as:

 
 
 
 

23. In equations of motion, quantities in the direction of initial velocity are taken as:

 
 
 
 

24. Series of experiments on free fall of heavy bodies was performed by:

 
 
 
 

25. 72 kmh⁻¹ = 

 
 
 
 

26. If a body is thrown upward, then its gravitational acceleration will be:

 
 
 
 

27. Speed of cheetah

 
 
 
 

28. Which of the following is a vector quantity?

 
 
 
 

29. By which quantity should we divide acceleration in kmh⁻² to get its value in ms⁻²?

 
 
 
 

30. The rate of displacement with respect to time is known as:

 
 
 
 

31. Speed is a:

 
 
 
 

32. Causes day and night on the Earth:

 
 
 
 

33. Velocity of a paratrooper coming down with constant velocity is also called:

 
 
 
 

34. The velocity and acceleration of a body moving with uniform speed in a circular path will be:

 
 
 
 

35. The shortest distance between two points is known as:

 
 
 
 

36. The spinning motion of a body about its axis is known as

 
 
 
 

37. 50 kmh⁻¹ =

 
 
 
 

38. If velocity of a body changes equally in equal intervals of time then its acceleration will be:

 
 
 
 

39. If the direction of motion of body and acceleration are in same direction then acceleration will be:

 
 
 
 

40. SI unit of acceleration is:

 
 
 
 

41. 1ms⁻¹= 

 
 
 
 

42. Speed of falcon is:

 
 
 
 

43. If the direction of motion of body and acceleration are in opposite direction then acceleration will be:

 
 
 
 

44. The motion of rider in a Ferris wheel is:

 
 
 
 

45. The quantity which are described by magnitude as well as direction is called:

 
 
 
 

46. In equations of motion, quantities opposite to the direction of initial velocity are taken as:

 
 
 
 

47. The slope of straight line in speed time graph gives the magnitude of: 

 
 
 
 

48. When a body is falling freely under the gravity then in equations of motion ‘a’ is replaced by:

 
 
 
 

49. If a body does not change its position with respect to some observer then it will be in a state of

 
 
 
 

50. Area under the speed time graph shows: 

 
 
 
 

51. The area uner a speed time graph respresents

 
 
 
 

52. If the velocity of a body is uniform then its acceleration will be:

 
 
 
 

53. If a body is falling under the gravity then its gravitational acceleration will be:

 
 
 
 

54. In distance time graph time is taken along: 

 
 
 
 

55. To get speed in ms⁻¹, we multiply speed in kmh⁻¹ by:                 

 
 
 
 

56. If a car is moving with uniform speed in a circle then its velocity will be:

 
 
 
 

57. The quantity which can be described by a number, with suitable unit only is called:

 
 
 
 

58. Study of motion without discussing the cause of motion is called:

 
 
 
 

Short Questions

A body is moving with uniform speed. Will its velocity be uniform?
Can a body moving at a constant speed have acceleration?
Can a body moving with certain velocity in the direction of east can have acceleration in the direction of west?
Can a body moving with constant velocity have acceleration?
Can you point out some differences in circular and rotatory motion?
Define acceleration?
Define average velocity?
Define Axis of rotation
Define kinematics?
Define Magnitude.
Define mechanics? Write its branches
Define Origin?
Define the surroundings?
Define the term position?
Define the variable velocity?
Define uniform acceleration?
Define uniform speed.
Define uniform velocity?
Define variable acceleration.
Define variable speed.
Define variable velocity.
Derive the first equation of motion for uniformly accelerated rectilinear motion.
Describe rotatory motion with the help of examples?
Describe the purpose of different equations of motion?
Describe translatory motion with the help of examples?
Describe vibratory motion with the help of examples?
Difference between rest and motion?
Differentiate between Circular motion and rotatory motion
Differentiate between Distance and displacement
Differentiate between Linear and random motion
Differentiate between positive and negative acceleration?
Differentiate between Rest and motion
Differentiate between Scalers and Vectors
Differentiate between Speed and velocity
Differentiate Distance and displacement?
Differentiate scalar and vector quantities.
Does speedometer of a car measure its velocity?
Drop an object from some height and observe its motion. Does its velocity increase, decrease or remain constant as it approaches the ground?
Explain the motion of freely falling bodies?
Explain translatory motion and give examples of various types of translator motion.
Give an example of a body that is at rest and is in motion at the same time.
How a vector is represented?
How are vector quantities important to us in our daily life?
How can vectors quantities can be represented graphically?
How can we find distance from speed time graph?
How can we use equations of motion for bodies, which are falling freely under the gravity?
How do riders in a Ferris wheel possess Translatory motion but not circular motion?
How you will Define the uniform speed?
Justify the need of direction for a vector quantity.
List the types of motion?
Plot and interpret a distance-time graph for a body moving with constant speed?
What are equations of motion?
What are the points kept in mind when bodies are moving freely under gravity?
What do you mean by the graph, variables, independent quantity and dependent quantity?
What do you mean by the speed-time graph?
What is LIDAR GUN?
What is meant by positive acceleration and negative acceleration?
What is meant by the acceleration?
What is Position?
What is terminal velocity?
When a body is said to be at rest?
When a body is thrown vertically upward, its velocity at the highest point is zero. Why?
When does a body possess acceleration?
Which is the fastest animal on the Earth?
Which of the following can be obtained from the speed-time graph of a body?   (i) Initial speed  (ii)  Final speed (iii) Distance covered in time t (iv) Acceleration of motion
Why a body moving along a circle with uniform speed has variable velocity?
Why vector quantities cannot be added and subtracted like scalar quantities?
Write equations of motion for bodies moving under gravity?
Write formulae to find area rectangle, triangle and trapezium.

Long Questions

 

A car has a velocity of 10 ms⁻¹. It accelerates at 0.2 ms⁻² for half minute. Find the distance travelled during this time and the final velocity of the car.
A car moves with a uniform velocity of 40 ms⁻¹ for 5 s. It comes to rest in the next 10 s with uniform deceleration. Find deceleration and total distance travelled by car.
A cricket ball is hit vertically upwards and returns to ground 6 s later. Calculate (i) Maximum height reached by the ball (ii) initial velocity of the ball
A tennis ball is hit vertically upward with a velocity of 30 ms⁻¹, it takes 3 s to reach the highest point. Calculate the maximum height reached by the ball. How long it will take to return to the ground?
A train moves with a uniform velocity of 36 kmh⁻¹ for 10 s. Find the distance travelled by it.
A train starting from rest, accelerates uniformly and attains a velocity of 48 kmh⁻¹ in 2 minutes. It travels at this speed for 5 minutes. Finally, it moves with uniform retardation and is stopped after 3 minutes. Find the total distance travelled by train.
A train starts from rest. It moves through 1 km in 100 s with uniform acceleration. What will be its speed at the end of 100 s.? 
Define the terms Speed, velocity and acceleration with examples
Define Translatory motion and its types.
Derive equations of motion for uniformly accelerated rectilinear motion.
Derive first equation of motion using speed time graph.
Derive second equation of motion using speed-time graph.
Derive the equation of motion which is independent of distance S.
Derive the equation of motion which is independent of t.
Derive the second equation of motion for uniformly accelerated rectilinear motion.
Derive the second equation of motion?
Derive the third equation of motion for uniformly accelerated rectilinear motion.
Derive the third equation of motion?
Derive third equation of motion using speed-time graph.
Describe the different types of translatory motion?
Explain Distance — time Graph.
Explain Speed — Time Graph.
Prove that vf = vi + at.
Prove that   2aS = vf² – vi²
Prove that   S = Vit + ½ at²
Sketch a distance-time graph for a body at rest. How will you determine the speed of a body from this graph?
Sketch a distance-time graph for a body moving with variable speed?
Sketch a speed-time graph for a body moving with uniformly changing speed?
Sketch a speed-time graph for distance travel by a moving object?
Sketch a velocity-time graph for the motion of the body. From the graph explaining each step, calculate total distance covered by the body.
When brakes are applied, the speed of a train decreases from 96 kmh⁻¹ to 48 kmh⁻¹ in 800 m. How much further will the train move before coming to rest? (Assuming the retardation to be constant). Find the time taken by the train to stop after the application of brakes.

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