Matric Part 1/9th Class Physics Chapter 2 Long Question With Answer for Unit 2 Kinematics

Question # 1

Derive first equation of motion. or prove that vf = vi+at

Ans 1: consider a body moving with initial velocity vi in a straight line with uniform acceleration . Its velocity becomes vf after time t. The motion of body is described by speed time graph as shown in figure by line AB. The slope of line AB is acceleration a. speed time graph from the motion of a body is shown in figure
slope of line AB gives the acceleration of body

Question # 2

what is graph. Explain the motion graphically

Ans 1: Graph: graph is a pictorial way or presenting information about the relation between various quantities. The quantities between which a graph is plotted are called variables
There are two types of variables
Independent variables, Dependent variable
independent variables: The quantity which vary independently called as independent variables e.g. Time
Dependent variables: The quantity which varies with independent quantity is called dependent variables e.g. Velocity
Ans 2: Distance time graph: in distance time graphs, time is taken at x axis and distance is taken on y axis

Object at rest: when distance covered by an object with time is zero with respect to observer and time is going on. Horizontal lines parallel to time axis on a distance time graph shows that object is at rest

Object moving with constant speed: speed of object is said to be constant if it covers equal distances in equal interval of time
Ans 3: Object moving with variable speed: when an object does not cover equal distance in equal intervals of time . In this case distance time graph is not a straight line.
Speed is higher when slope is greater. Speed is zero when slope is horizontal
Ans 4: Speed time graph: in speed time graph, time is taken along x axis and speed is taken along y axis

Object moving with constant speed: a straight line parallel to time axis represents constant speed of object
Object moving with uniform acceleration: straight line means that object is moving with uniform acceleration. Slope of line gives magnitude of its acceleration
Ans 5: Distance travelled by a moving object: area under speed time graph represents the distance travelled by object. If motion is uniform then area can b e calculated using appropriate formula for geometrical shapes represented by graph

Question # 3

Define kinematics and explain rest and motion are relative

Ans 1: Kinematics: kinematics is the branch of mechanics which related to study of motion of objects without discussing the cause of its motion.
Ans 2: Rest: A body is said to be a t rest if it does not change its portion with respect to its surroundings
Ans 3: Motion; A body is said to be in motion if it changes its position with respect to its surroundings
Ans 4: Relative states of rest or motion: state of rest or motion of a body is relative
Example: A passenger sitting in moving bus is at rest because he is not changing his position w.r.t other passengers or objects in the bus. But to an observer outside the bus, the passengers and objects inside bus are in motion

Question # 4

Explain the term speed and velocity

Ans 1:
Speed: Distance covered by an object in unit time is called its speed. It is represented by v.
Formula: speed=distance covered/time taken
v=s/t
s=vt
unit: speed is a scalar
Ans 2:
Velocity: the rate of change of displacement is called velocity.it is represented by v
Formula: velocity= displacement /time taken
v=d/t
unit: velocity is a vector quantity and its unit is meter per second

Question # 5

Given Data: Vi =0 g = 10ms-² t = 5s S=h=? Vf=?

Ans 1: Solution: h= Vit+ 1/2 gt² putting values h = 0x5+1/2(10)(5)² = 0+125 h=125m Vf²=2500m²s-² vVf² = v2500m²s-² eg.. ( root cut with power ²) Vf = 50ms-¹ Ans..

Question # 6

A cricket ball is hit vertically upwards and returns to ground 6s later. Calculate 1- maximum height reached by the ball. 2- Initial velocity of the ball. Given Data: t=6s =6/2 =3s h= ? Vi = ? Vf =0 g = -10ms-²

Ans 1: Solution: 2 Vf= Vi + gt Putting the values 0= Vi+(-10)(3) 0= Vi -30ms-¹ Vi=30ms-¹ 1 h= Vit + 1/2 gt² h=30(3) +1/2 (-10)(3)² = 90-90/4 = 90-45m h= 45m Ans'' ___

Question # 7

Describe uniform speed and uniform velocity

Ans 1: Uniform speed: a body has uniform speed if it covers equal distance in equal interval of time however short the interval may be
Ans 2: Uniform velocity: a body is said to be in uniform velocity if it covers equal displacement in equal interval of time however short the interval may be

Question # 8

Explain the type of motion

Ans 1: There are three types of motion
translatory motion, rotatory motion, vibratory motion
Ans 2: Translatory motion: in translatory motion, a body moves along a line without any rotation. The line may be straight or curved.
Example: Falling of a moving body and translatory motion of riders in ferris wheel
Types of translatory motion: linear motion, circular motion, random motion
Ans 3: Linear motion: straight line motion of a body is known as its linear motion
Example: Aero plane flying straight in air, car moving on a straight and level road, freely falling bodies
Circular motion: The motion of a n object in a circular path is known as circular motion.
Example: A stone tied at the end of string moves in a circular motion
A toy train moving in a circular path
motion of earth around the sun Note : in circular motion, the point about which body goes around, is outside the body.
Ans 4: Random motion: The disordered or irregular motion of an object is called random motion
Example; motion of insects and birds
motion of dust and smoke particles
brownian motion of a gas or a liquid molecules
Ans 5: Rotatory motion: spinning motion of a body about its axis is called its rotatory motion.
Axis: An axis is a line around which a body rotates
Example: motion of a wheel about its axis
motion of a top about its axis
motion of a steering wheel
Note: in rotatory motion the line, around which a body moves about, is passing through the body itself
Vibratory motion: to and fro motion of a body about its mean position is known as vibratory motion
Example: to and fro motion of a pendulum clock about its mean position
children playing see-saw

Question # 9

What are scalars and vectors. How vectors are represented

Ans 1: Scalers: physical quantities that can be described completely by its magnitude only are called as scaler quantity
Example: work, energy, mass, length, time and temperature etc
Ans 2: Vector; physical quantities that required both magnitude and direction for their representation are called vector quantities
Example: velocity, displacement , force , torque and momentum etc
Ans 3: Representation of vectors: Vectors can be represented by two way:
Symbolic representation, Graphical representation
Ans 4: Symbolic Representation: symbolically a Vectors can be represented in the following way
To differentiate a vector from scalar quantity we generally use bold letters to represent vector quantities such as F, a, d etc.
Ans 5: Graphical representation: Graphically a vector can be represented by a line segment with an arrow head.
length of line segment gives the magnitude of vector on selected scale
while the arrow head shows the direction of vector

Question # 10

Difference between scalars and vectors quantities.

Ans 1: Scalars Quantities: " A scalar quantity by its magnitude only." Explanation: A physical quantity which can be completely described by its magnitude is called a scalar. The magnitude of a quantity means its numerical value with an appropriate unit such as 2.5 kg, 40s , 1.8m, etc. Examples: Examples of scalars are mass, length, time speed, volume, work and energy. Vectors Quantity: " A vector quantity is described completely by magnitude and direction." Explanation: A vector can be described completely by magnitude along with its direction. It would be meaningless to describe vectors without direction Examples: Distance of a place from reference point is insufficient to locate that place. The direction of that place from reference point is also necessary to locate it. Examples of vectors are velocity, displacement, force, momentum, torque etc.

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Matric Part 1/9th Class Physics Chapter 2 Long Question With Answer for Unit 2 Kinematics

9th Class English Medium Subjects

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Online Long Questions For Chapter 2 "9th Class Physics Chapter 2 Long Question Preparation "

Physics (New Book) - 9th Class Physics Chapter 2 Long Question Preparation

Derive first equation of motion. or prove that vf = vi+at

what is graph. Explain the motion graphically

Define kinematics and explain rest and motion are relative

Explain the term speed and velocity

Given Data: Vi =0 g = 10ms-² t = 5s S=h=? Vf=?

A cricket ball is hit vertically upwards and returns to ground 6s later. Calculate 1- maximum height reached by the ball. 2- Initial velocity of the ball. Given Data: t=6s =6/2 =3s h= ? Vi = ? Vf =0 g = -10ms-²

Describe uniform speed and uniform velocity

Explain the type of motion

What are scalars and vectors. How vectors are represented

Difference between scalars and vectors quantities.

Prepare Complete Set Wise Questions For Chapter 2 "9th Class Physics Chapter 2 Long Question Preparation "

Set 1

9th Class Physics Chapter 2 Long Question Preparation - Set 1

Derive first equation of motion. or prove that vf = vi+at

what is graph. Explain the motion graphically

Define kinematics and explain rest and motion are relative

Explain the term speed and velocity

Given Data: Vi =0 g = 10ms-² t = 5s S=h=? Vf=?

A cricket ball is hit vertically upwards and returns to ground 6s later. Calculate 1- maximum height reached by the ball. 2- Initial velocity of the ball. Given Data: t=6s =6/2 =3s h= ? Vi = ? Vf =0 g = -10ms-²

Describe uniform speed and uniform velocity

Explain the type of motion

What are scalars and vectors. How vectors are represented

Difference between scalars and vectors quantities.

9th class Physics Chapter 2 Long Q's (English Medium)

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