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Question: 1
What is velocity?
Answer: 1
1-120The rate of change of displacement of a body is known as its velocity . It is a vector quantity .
Formula: V= d/t
Question: 2
Can a body moving at a constant speed have acceleration
Answer: 2
2-120No because there is no change in its speed. While change in speed is a necessary condition for acceleration, fso acceleration will be zero But except in a circular path.
Question: 3
Define scalar quantity and also give example
Answer: 3
3-120A quantity which can be discribed by its magnitude only is called scalar quantity
Question: 4
Define circular motion
Answer: 4
4-120Circular Motion: Motion of a body in a circular path is called circular motion. In circular motion a point around which body moves lies outside the body.
Question: 5
What is rotatory motion
Answer: 5
5-120The spinning motion of a body about its axis is called rotatory motion
Question: 6
Define speed.
Answer: 6
6-120Distance moved by an object in unit time is called speed.
Formula: its formula is v=s/t its unitis ms-1
Question: 7
What is velocity
Answer: 7
7-120The rate of change of displacement of a body is know as its velocity. it is a vector quantity
Question: 8
Define rest
Answer: 8
8-120A body is said to be at rest, if it is not changing its position with respect to its surroundings.
Question: 9
Why vector quantities cannot be added and subtracted like scalar quantities.
Answer: 9
9-120Vectors cannot be added like scalars because in scalars we have only magnitude so scalars are added by ordinary algebra while in vectors direction is also important so, they can be added using head to tail rule.
Question: 10
How a vector can be represented graphically
Answer: 10
10-120Graphically a vector can be represented by a line segment with an arrow head.
Example: In figure, a line AB write arrow head on one side. The length of line shows the magnitude of vector and the arrow head shows its direction.
Question: 11
Define Motion.
Answer: 11
11-120A body is said to be in motion, if it changes its position with respect to its surroundings.
Example: A train is changing its position with respect of platform so it is in motion .
Question: 12
Sketch a distance-time graph for a body starting from rest. How will you determine speed of body from this graph
Answer: 12
12-120Distance-time graph for a body starting from rest are of two types.
When speed is constant speed can be determined by slope of line
When speed is variable speed can be find out by slope of tangent line at any point
Question: 13
Define Rest.
Answer: 13
13-120A body is said to be at rest, if it is not changing its position with respect to its surroundings .
Example: A tree with respect to a platform is at rest because it does not change it position.
Question: 14
Define circular motion.
Answer: 14
14-120Motion of a body in a circular path is called circular motion. in circular motion a point around which body moves lies outside the body
Question: 15
How do riders in a ferris wheel possess translatory motion but not rotatory motion
Answer: 15
15-120Riders of Ferris wheel possess translatory motion because they move in circular track without spinning while the itself motion of Ferris wheel is rotatory.
Question: 16
What would be shape of speed-time graph of a body moving with variable speed.
Answer: 16
16-120Shape of a speed-time graph of an object moving with variable speed will always be a curve. It would never be a straight line.
Question: 17
What is rotatory motion? Give example.
Answer: 17
17-120The spinning motion of a body about its axis is called rotatory motion.
Example: The Motion of wheel about its axis.
Earth revolves around its geographical axis that causes day and night.
Question: 18
Which of the following can be obtained from speed-time graph of a body
Answer: 18
18-120Initial speed, Final speed. Distance covered,
Using speed time graph of a body we can find all of above quantitites as distance covered can be find out by the area under line curve and acceleration can be find out by the slope of line.
Question: 19
Define uniform speed.
Answer: 19
19-120A body has uniform speed if it covers equal distance in equal intervals of time however the short interval may be .
Question: 20
Define uniform speed
Answer: 20
20-120A body has uniform speed if it covers equal distance in equal intevals of time however the short interval may be
Question: 21
Define axis:
Answer: 21
21-120An axis is a line around which a body rotates.
Question: 22
What is a vector quantity?
Answer: 22
22-120Vector quantity described completely by magnitude and direction .
Example: Weight, force, momentum etc.
Question: 23
Define terminal velocity
Answer: 23
23-120When an object moves vertically downward nd it attains uniform velocity. Then its uniform velocity is called terminal velocity.
Question: 24
In the absence of air resistance during the free fall motion, which body ground first light or heavy
Answer: 24
24-120As the gravitational acceleration is independent of the mass of the body so if we neglect air resistance all the bodies fall to the ground at the same time.
Question: 25
Define acceleration.
Answer: 25
25-120Rate of change of velocity of a body in caused it acceleration, it is a vector quantity.
Formula: a= Vf-Vi/t
Unit is ms-2 or Kmh-2
Question: 26
Define vibratory motion
Answer: 26
26-120To and Fro motion of a body about its mean position is known as vibratory motion
Question: 27
Define vibratory motion.
Answer: 27
27-120To and fro motion of a body about its mean position is known as vibratory motion
Example: Pendulum of clock has vibratory motion.
Question: 28
Who noticed about all freely falling objects fall with same acceleration
Answer: 28
28-120Galileo was the first scientist who noticed about all freely falling objects fall with same acceleration g
Question: 29
Different between distance and displacement.
Answer: 29
29-120The difference b/w distance and displacement is following.
Question: 30
What is scalar quantity and also give example.
Answer: 30
30-120A quantity which can be described by its magnitude only is called scalar quantity
Example: Distance, work,power etc.
Question: 31
Differentiate between translator motion and circular motion.
Answer: 31
31-120Translators motion: In translational motion, a body moves along a line without any rotation. the lines may be straight or curved.
Example. i. Motion of the side in ferris wheel.
ii. Motion of a car along a straight line.
Question: 32
Wha is significance of graph in daily life
Answer: 32
32-120A graph may also be used in everyday life such as to show year wise growth decline of export month-wise rain fall, a patients temperature record or runs per over scored by a team.
Question: 33
Define Brownian motion.
Answer: 33
33-120Random motion of gas molecules is called brownian motion.
Question: 34
Define axis.
Answer: 34
34-120An axis is a line around which a body rotates.
Question: 35
What is LIDAR
Answer: 35
35-120A motorway speed camera. A LIDAR gun is light detection and ranging speed gun It uses the time taken by laser pulse to make a series of measurements of a vehicle distance from the gun The data is then used to calculate the vehicle's speed
Question: 36
Define variable.
Answer: 36
36-120The quantities among which the graph is plotted are called variables.
Question: 37
Writer four examples of vectors.
Answer: 37
37-120Scalar: The quantities which are described completely by its magnitude only is called scalar quantities.
Examples: Mass, length, time speed and volume.
Question: 38
What is graph?
Answer: 38
38-120Graph is a pictorial way of presenting information about relation between various quantities.The quantities are dependent and independent.
Question: 39
Does speedometer of a car measure its velocity.
Answer: 39
39-120No, speedometer only measure the speed of the car, because it can not indicate the direction of motion of the car.
Question: 40
Define dependent and independent quantities.
Answer: 40
40-120The quantitiy which can vary with our wish is called independent quantity
Dependent The quantity whose value according to the changes in independent quantity dependent quantity.
Question: 41
Differentiate between distance and displacemnt.
Answer: 41
41-1201.Distance: Length of path between two points is called distance between those points.
2.Distance is scalar quantity and its symbol is S.
3.Its units is metere.
Question: 42
How are vector quantities important to us in our daily life.
Answer: 42
42-120With the help of vectors we can locate or point out the position of any object Action and reaction forces can also be explain in terms of vectors.
Question: 43
Define uniform velocity:
Answer: 43
43-120If a body covers equal displacement in equal intervals of time however short the interval may be is known as uniform velocity.
Question: 44
How are vector quantities important to use in our daily
Answer: 44
44-120Vector quantities are important to us in our daily life in engineering, building and drawing diffferent techniques. If we want find direction of moving object then we can do with help of vector quantities.
Question: 45
Define uniform acceleration.
Answer: 45
45-120A body as uniform acceleration if it has equal changes in velocity in equal intervals of time however short interval may be.
Question: 46
What is graph
Answer: 46
46-120Graph is pictorial way of presenting information about relation between various quantities The quantities re dependent and independent
Question: 47
Differentiate between Rest and motion.
Answer: 47
47-120Rest: A body is said to be at rest , if it is not changing its position with respect to its surroundings.
Examples: A wall ii. A chair
Question: 48
How ms2 converted into kmh2
Answer: 48
48-120To convert acceleration form ms to kmh we multiply it with 12960
Question: 49
When doses the acceleration of a body is positive and negative.
Answer: 49
49-120When the velocity of a moving body is increasing with time its acceleration is positive When the velocity of a moving body is decreasing with time its acceleration is taken as negative it is also called retardation or deceleration,
Question: 50
Define uniform velocity
Answer: 50
50-120A body has uniform speed if it covers equal distance in equal intervals of time however short to interval may be.
Question: 51
A sprin'er complete its 100m race 12s, Find its average speed
Answer: 51
51-120Total distance=100m
Average speed= Displacement/Time Taken
Question: 52
Define gravitational acceleration
Answer: 52
52-120The acceleration of a body when it moves vertically upward or downward freely is called gravitational acceleration
It is denoted by g
Its magnitude is 10ms at earth
Question: 53
When body are moving in upward direction
Answer: 53
53-120Final velocity vf of the body will be zero
Gravitational acceleraton will be negative
Question: 54
What is Lidar gun
Answer: 54
54-120A Lidar gun is light detection and ranging speed gun It uses the time taken by laser pulse to make a series of measurements of a vehicles distance from the gun. The data is then used to calculate the vehicles speed
Question: 55
Under what conditions the value of g is positive/negative
Answer: 55
55-120Positive value When the body is moving vertically downward the value of g is positive
Question: 56
How can we convert kmh into ms
Answer: 56
56-120The given speed in kmh is divided by 3.6 to the speed in ms
Question: 57
how can we convert 1ms into kmh
Answer: 57
57-120The given speed in ms is multiplied by 3.6 to get speed in kilometer per hour
Question: 58
When bodies are moving in downward direction
Answer: 58
58-120Initial velocity v of the freely faling body will be zero
Gravitational acceleration will be positive.
Question: 59
Define variable
Answer: 59
59-120The quantities among which the graph is plotted are called variables
Question: 60
Mention the type of motion in each of the following
Answer: 60
60-120A ball moving vertically upward: If a ball is moving vertically upward then its motion is linear
Question: 61
A body is moving with uniform speed
Answer: 61
61-120Velocity of a body has magnitude as well as direction. For a body to more with uniformvelocity it speeds as well as its direction should remain the same Thus it can only me possible if a body is moving in a straight line with constant speed, then its velocity will also be uniform i.e if a body does not change its direction.
Question: 62
Define gravitational acceleration.
Answer: 62
62-120The acceleration of a freely falling bodies is cled gravitational acceleration. It is denoted by g Its value is
Question: 63
Differentiate between distance and displacement.
Answer: 63
63-120Distance: Length of a path between two points is called the distance between those points.
Question: 64
When a body falls freely, which quantity remains the same and which increases
Answer: 64
64-120During the free fall motion, acceleration is independent of the mass of the body remains the same throughout the motion and velocity of the body increases continuously.
Question: 65
Does speedometer of a car measure its velocity
Answer: 65
65-120No speedometer only measures the speed of the car because it can indicate the direction of motion of the car.
Question: 66
What is meant by positive and negative acceleration ?
Answer: 66
66-120Positive acceleration:
Acceleration of a body is positive if its velocity increases with time.
Question: 67
Sketch a speed time graph of on object moving with uniform
Answer: 67
67-120If a body is moving uniform changing speed its speed time graph is straight line
Question: 68
What would be the shape of a speed time graph of a body moving with variable speed.
Answer: 68
68-120When a body is moving with variable speed the shape of its speed time graph is not a straight line It is always a curved path.
Question: 69
A car starts from rest. Its velocity becomes 20ms-¹ in 8s.
Find the acceleration.
Answer: 69
69-120We know that
Question: 70
Give an example of a body that is at rest and is in motion at the same time.
Answer: 70
70-120A passenger sitting in a moving bus is at rest because he/she is not changing his/her position with respect to other passenger or objects in the bus. But to an observer outside the bus, the passengers and the objects inside the bus are in motion
Question: 71
Define acceleration and write its formula.
Answer: 71
71-120Acceleration:
The rate of change of velocity
of
Formula:
=
Question: 72
What are the points to be kept in mind when bodies are moving freely under gravity
Answer: 72
72-120While using equatins of motion for bodies falling freely, it should be kept in mind that
Question: 73
Write equations of motion
Answer: 73
73-120Equations of motion due to gravity are as
Question: 74
What is meant by position
Answer: 74
74-120The term position describe the location of a place or point with respect to some reference point is called origin.
Question: 75
Why does the velocity of a thrown up body become zero at the highest point
Answer: 75
75-120When a body is thrown vertically upward it moves under gravity against the force of attraction of Earth So after every second the velocity of the body decreases by 9.8 and ultimately becomes zero at the highest point That is why the velocity of a body becomes zero at the highest point
Question: 76
Define two types of motion.
Answer: 76
76-120Linear Motion: Straight line motion of a body is know as its linear motion.
Example Car moving on straight line.
Question: 77
Define Brownain motion
Answer: 77
77-120Define Brownian motion
Question: 78
Differentiate between translator motion and circular motion
Answer: 78
78-120In translational motion, a body moves along a line without any rotation., The lines may be straight or curved
Example Motion of the sides in Ferris wheel.
Motion of a car long a straight line.
Question: 79
Differentiate between rest and motion
Answer: 79
79-120Rest A body is said to be at rest, if is not changing its position with respect to its surroundings.
A wall, A chair
Question: 80
Differentiate distance and displacement.
Answer: 80
80-120Distance: Length of a path between two points is called the distance between those points.
It is a scalar quantity.
Distance represented by S
Distance can be find by the formula
In picture dotted line shows distance.
Question: 81
Write types of motion
Answer: 81
81-120There are three types of motion.
Translatory motion linear random and circular motion
Rotatory motion, Vibratory motion.
Question: 82
Define Motion also write its types.
Answer: 82
82-120Motion: A body is said to be motion, if it changes its postion with respect to tis surrounding.
Example: Moving car on road
Question: 83
Define uniform acceleration
Answer: 83
83-120A body as uniform acceleration if it has equal changes velocity in equal interval of time. however short interval may be
Question: 84
Cheeta can run at a speed of 70 kmh convert this speed
Answer: 84
84-120speed of Cheetah =v= 70kmh
Question: 85
Define Kinematic
Answer: 85
85-120Kinematics: Kinematics is the study of motion of an objects without discussing the casuse of motion.
Question: 86
Differentiate between variable and uniform speed
Answer: 86
86-120Variable speed: A body has variable speed if does not cover equal distance in equal intervals of time. however short the interval may be.
Question: 87
How vector quantities are representation
Answer: 87
87-120Graphically a vector can be represented by a line segment with an arrow head which represents its direction and the length of line segment gives its magnitude according to selected scale. AB is length of vector V and its diectioin is from A to B
Question: 88
How is a vector represented
Answer: 88
88-120There are two methods to represent a vector
Question: 89
Why vector quantities cannot be added and subtracted like scalar quantities
Answer: 89
89-120The quantities having direction cannot be added and subtracted like scalar quantities because scalar quantities have no any direction but the vector quantities have direction.
Question: 90
Define velocity and rite its equation
Answer: 90
90-120Velocity: The rate of change of displacement is called velocity
Question: 91
A sprinter completes its 100 meter race in 12 Find his average speed
Answer: 91
91-120Total distance = 100m
Total time taken = 12s
Average speed= Total distence covered/Total time taken
Question: 92
A train moves with a uniform velocity of 36 kmh for 10s
Answer: 92
92-120velocity of train = v = 36kmh
Question: 93
Define position and give exmple.
Answer: 93
93-120Position means the location of a certain place or object from a reference point
Examples: In figure the point P represents the positive of the body with respect to origin O
Question: 94
Define speed and write its unit.
Answer: 94
94-120Speed The distance covered by an object in unit time is called its speed Speed is scalar quantity
Question: 95
What is difference between positive acceleration and negative acceleration
Answer: 95
95-120Negative acceleration: Acceleration of body is negative if velocity of the body decreases with time The negative acceleration is also called deceleration or retardation.
When moving bodies stops it gives retardation
The direction of negative acceleration is opposite to the direction in which the body in moving.
Question: 96
Convert 20ms speed in kmh
Answer: 96
96-120Speed in ms = 20ms
Question: 97
Define kinematics
Answer: 97
97-120Kinematics:
The study of motion of objects without discussing the cause of motion is called kinematics.
Question: 98
Differentiate speed and velocity.
Answer: 98
98-120Speed Rate of change of distance is called speed.
It is a scalar quantity
Its unit is ms
It is drived by following formula.
Question: 99
Define terminal velocity.
Answer: 99
99-120Terminal velocity: The uniform velocity of free falling objects attains is called terminal velocity.
Example A paratrooper attains a uniform velocity called terminal velocity with which comes to ground
Question: 100
Define uniform speed and uniform velocity.
Answer: 100
100-120Uniform speed: A body has uniform speed if it covers equal distance in equal intervals of time however short the interval may be
Question: 101
What is retardation
Answer: 101
101-120The acceleration of a body whose velocity decreases is called retardation It is also called negative acceleration of body
Question: 102
How is a vector represented?
Answer: 102
102-120Graphically a vector can be represented by a line segment with a arrow head which represents its direction and the length of line segment gives its magnitude according to selected scale.
Question: 103
Write types of motion types of Motion:
Answer: 103
103-120There are three types of motion.
1- Translatory motion
2- Rotatory motion
3- Vibratory motion.
Question: 104
Convert 50kmh-¹ speed of a body into ms-¹
Answer: 104
104-120 50 x 1000/3600 ms-¹
Question: 105
Define Average Velocity and write its formula.
Answer: 105
105-120Average Velocity: The change in total is displacement with respect to total time is called average velocity
Average Velocity: Total displacement/total time.
Question: 106
Define rotatory motion. With example.
Answer: 106
106-120Rotatory Motion:
The spinning motion of a body about its axis is called rotatory motion.
Examples:
Motion of top, motion of ceiling fan.
Question: 107
A player coves 80m distance in 10 second
Answer: 107
107-120Required: Average speed =vav
Question: 108
Difference between scalar and vector.
Answer: 108
108-120Scalar:
1- A scalar quantity is described completely by its magnitude only.2- Mass, length, time etc are examples of scalars.
Question: 109
Write three equations of motion for bodies moving under gravity.
Answer: 109
109-120Following are the equations of motion under gravitation.
First equation of motion vf= vi+gt
Question: 110
Write down the formula and unit to find Acceleration.
Answer: 110
110-120Formula: Acceleration can be found out by given formula
Acceleration = Change in velocity/time taken
Question: 111
Define random motion and give example .
Answer: 111
111-120Random Motion:
The disordered or irregular motion of an object is called random motion for example, the motion of insects and birds.
Question: 112
Define vector and write the name of two methods of vector, quantities, representation,
Answer: 112
112-120Vector:
A vector quantity is described completely by magnitude and direction
There are two methods of vector representation.
1- Symbolic representation
2-Graphical representation
Question: 113
What is the equation of motion
Answer: 113
113-120Equation of Motion: Vf = Vi +at
Equations of motion for uniformly acceleratedmotion are
S= Vit +1/2at²
2aS =Vf²-Vi²
Question: 114
Define vibratory motion and give example .
Answer: 114
114-120Vibratory Motion:
To and fro motion of a body abouts its mean position is known as vibratory motion.
Example:
Motion of a see-saw.
Question: 115
Define rest and motion.
Answer: 115
115-120Rest:
A body is said to be at rest if it does not change its position with respect to its surroundings.
Motion:
A body is said to be in motion if it changes its position with respect to its surroundings .
Question: 116
Define gravitationalacceleration .
Answer: 116
116-120The accelerationof freely falling bodies is called gravitationalacceleration. Its value is 10ms-²
Question: 117
What do you know about position ?
Answer: 117
117-120Position:
The term position describes the location of a place or a point with respect to some reference point called origin .
Question: 118
Can a body moving at a constant speed have acceleration?
Answer: 118
118-120Yes, When a body move along circular path with constant speed it has acceleration due to centripetal force
Question: 119
Define circular motion . With example
Answer: 119
119-120Circular Motion:
The motion of a object in a circular path is known as circular motion of ceiling fan .
Question: 120
Define circular motion. With example.
Answer: 120
120-120Circular Motion:
The motion of a object in a circularpath is known as circular motion.
Example :
Motion of earth around sun.