NCERT Solutions Class 9 Scinece Chapter 8 Motion Download In Pdf

Chapter 8 Motion Download in pdf

NCERT Solutions Intext Questions Page no.100

**Question 1.** An object has moved through a
distance. Can it have zero
displacement? If yes, support
your answer with an example.

**Question 2.** A farmer moves along the
boundary of a square field of side
10 m in 40 s. What will be the
magnitude of displacement of the
farmer at the end of 2 minutes
20 seconds?

**Question 3.** Which of the following is true for
displacement?

(a) It cannot be zero.

(b) Its magnitude is greater than
the distance travelled by the
object.

NCERT Solutions Intext Questions Page no.102

**Question 1.** Distinguish between speed and
velocity.

**Question 2.** Under what condition(s) is the
magnitude of average velocity of
an object equal to its average
speed?

**Question 3.** What does the odometer of an
automobile measure?

**Question 4.** What does the path of an object
look like when it is in uniform
motion?

**Question 5**. During an experiment, a signal
from a spaceship reached the
ground station in five minutes.
What was the distance of the
spaceship from the ground
station? The signal travels at the
speed of

NCERT Solutions Intext Questions Page no.103

**Question 1.** When will you say a body is in

(i) uniform acceleration?

(ii) nonuniform
acceleration?

**Question 2.** A bus decreases its speed from
80 km h–1 to 60 km h–1 in 5 s.
Find the acceleration of the bus.

**Question 3.** A train starting from a railway
station and moving with uniform
acceleration attains a speed
40 km h–1 in 10 minutes. Find its
acceleration.

NCERT Solutions Intext Questions Page no.107

**Question 1.** What is the nature of the
distance-time graphs for uniform
and non-uniform motion of an
object?

**Question 2.** What can you say about the
motion of an object whose
distance-time graph is a straight
line parallel to the time axis?

**Question 3.** What can you say about the
motion of an object if its speedtime
graph is a straight line
parallel to the time axis?

**Question 4.** What is the quantity which is
measured by the area occupied
below the velocity-time graph?

NCERT Solutions Intext Questions Page no.109

**Question 1.** A bus starting from rest moves
with a uniform acceleration of
0.1 m s-2 for 2 minutes. Find

(a)
The speed acquired,

(b) The
distance travelled

NCERT Solutions Intext Questions Page no.110

**Question 2.** A train is travelling at a speed of
90 km h–1. Brakes are applied so
as to produce a uniform
acceleration of – 0.5 m s-2. Find
how far the train will go before it
is brought to rest.

**Question 3.** A trolley, while going down an
inclined plane, has an
acceleration of 2 cm s-2. What will
be its velocity 3 s after the start?

**Question 4.** A racing car has a uniform
acceleration of 4 m s-2. What
distance will it cover in 10 s after
start?

**Question 5.** A stone is thrown in a vertically
upward direction with a velocity
of 5 m s-1. If the acceleration of the
stone during its motion is 10 m s–2
in the downward direction, what
will be the height attained by the
stone and how much time will it
take to reach there?

NCERT Solutions Exercises Questions

**Question 1.** An athlete completes one round of a circular track of diameter
200 m in 40 s. What will be the distance covered and the
displacement at the end of 2 minutes 20 s?

**Question 2**. Joseph jogs from one end A to the other end B of a straight
300 m road in 2 minutes 50 seconds and then turns around
and jogs 100 m back to point C in another 1 minute. What are
Joseph’s average speeds and velocities in jogging

(a) from A to
B and (b) from A to C?

**Question 3.** Abdul, while driving to school, computes the average speed for
his trip to be 20 km h–1. On his return trip along the same
route, there is less traffic and the average speed is
40 km h–1. What is the average speed for Abdul’s trip?

**Question 4.** A motorboat starting from rest on a lake accelerates in a straight
line at a constant rate of 3.0 m s–2 for 8.0 s. How far does the
boat travel during this time?

**Question 5.** A driver of a car travelling at 52 km h–1 applies the brakes and
accelerates uniformly in the opposite direction. The car stops
in 5 s. Another driver going at 3 km h–1 in another car applies
his brakes slowly and stops in 10 s. On the same graph paper,
plot the speed versus time graphs for the two cars. Which of
the two cars travelled farther after the brakes were applied?

**Question 6.** Fig 8.11 shows the distance-time graph of three objects A,B
and C. Study the graph and answer the following questions:

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- Chapter 3 Atoms and Molecules
- Chapter 1 Matter In Our Surroundings
- Chapter 2 Is Matter Around Us Pure
- Chapter 4 Structure of The Atom
- Chapter 5 The Fundamental Unit of Life
- Chapter 7 Diversity In Living Organisms
- Chapter 8 Motion
- Chapter 9 Force and Laws of Motion
- Chapter 10 Gravitation
- Chapter 11 Work And Energy
- chapter 12 Sound
- Chapter 13 Why Do We Fall Ill
- Chapter 14 Natural Resources
- Chapter 15 Improvement In Food Resources

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