5/22/22, 5:34 PM NCERT Solutions for Class 8 Science Chapter 11 - Force And Pressure

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NCERT Solutions for Class 8 Science Chapter 11 - Force And

Pressure
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NCERT Solutions 
Class 8 
Science 
Force And Pressure

Science NCERT Grade 8, Chapter 11, Force and Pressure as the name suggests, discusses the basic understanding of
force and pressure. In the first part of the chapter, the force is defined as a push or a pull and explained by citing various
examples. Activity under this part asks students to identify actions as a push or a pull. The next part focuses on the
interaction of one object with another object which results in force between the two. Subsequently, various other forces are
discussed along with examples in the chapter, Force and Pressure. Thereafter, the changes in the state of motion of an
object and the shape of the object due to the application of force are explained with the help of suitable activities.
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In the next part of the chapter, Force and Pressure, the concept of contact and non-contact forces are explained in detail
with examples along with activities giving information about magnetic and electrostatic forces. A short note on

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5/22/22, 5:34 PM NCERT Solutions for Class 8 Science Chapter 11 - Force And Pressure

gravitational force is also provided in the chapter, Force and Pressure. The concept of pressure is taken into consideration
towards the end of the discussion. Apart from this, the mathematical representation of pressure is also given under this
section. The above section is followed by short information on atmospheric pressure.

The chapter, Force and Pressure cover the following topics:

(a) Force- a push or a pull

(b) Forces are due to interactions

(c) Exploring forces

(d) Force can change the state of motion

(e) Force can change the shape of the object

(f) Contact forces

(g) Non-contact forces

(h) Pressure

(i) Atmospheric pressure

(j) Pressure exerted by liquids and gases

Page No 142:

Question 1:

Give two
examples each of situations in which you push or pull to change the
state of motion of objects.

ANSWER:

Two
examples of push force are as follows:
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(i) A heavy box at rest
is pushed to move it from one room to another. This changes the state
of motion of the box.

(ii) A player pushes a

football using his foot. This changes the state of motion of the
ball.

Two examples of pull

force are as follows:
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5/22/22, 5:34 PM NCERT Solutions for Class 8 Science Chapter 11 - Force And Pressure

(i) Rope is pulled to

draw water from a well. This changes the state of motion of the water
bucket.

(ii) A drawer is pulled

to open it. This changes the state of motion of the drawer.

Page No 142:

Question 2:

Give two
examples of situations in which applied force causes a change in the
shape of an object.

ANSWER:

Two
examples of forces that cause a change in
the shape of an object are as follows:

(i) Squeezing
of a plastic bottle changes the shape of the bottle.

(ii) Deformation
of clay by pressing it between the hands.

Page No 142:

Question 3:

Fill in
the blanks in the following statements.

(a) To
draw water from a well we have to _________
at the rope.

(b) A
charged body ________
an uncharged body towards it.
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(c) To
move a loaded trolley we have to _________
it. Share
(d) The
north pole of a magnet ________
the north pole of another magnet.

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5/22/22, 5:34 PM NCERT Solutions for Class 8 Science Chapter 11 - Force And Pressure

ANSWER:

(a) To
draw water from a well we have to __pull__
at the rope.

(b) A
charged body __attracts__
an uncharged body towards it.

(c) To
move a loaded trolley we have to __either
push or pull__ it.

(d) The
north pole of a magnet __repels__
the north pole of another magnet.

Page No 143:

Question 4:

An archer
stretches her bow while taking aim at the target. She then releases
the arrow, which begins to move towards the
target. Based on this
information fill up the gaps in the following statements using the
following terms.

muscular,
contact, non-contact, gravity, friction, shape, attraction

(a) To stretch the bow, the archer applies a force

that causes a change in its _______.

(b) The force applied by the archer to stretch the

bow is an example of ________
force.

(c) The type of force responsible for a change in

the state of motion of the arrow is an example of a _______
force.

(d) While the arrow moves towards its target, the

forces acting on it are due to ________
and that due to ________
of air.

ANSWER: 
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(a) To stretch the bow, the archer applies a force

that causes a change in its __shape__.

(b) The force applied by the archer to stretch the

bow is an example of __muscular__
force.

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5/22/22, 5:34 PM NCERT Solutions for Class 8 Science Chapter 11 - Force And Pressure

(c) The type of force responsible for a change in

the state of motion of the arrow is an example of a __contact__
force.

(d) While the arrow moves towards its target, the

forces acting on it are due to __gravity__
and that due to __friction__
of air.

Page No 143:

Question 5:

In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in each
case.

(a) Squeezing a piece of lemon between the fingers to extract its juice.

(b) Taking out paste from a toothpaste tube.

(c) A load suspended from a spring while its other end is on a hook fixed to a wall.

(d) An athlete making a high jump to clear the bar at a certain height.

ANSWER:

(a) In squeezing a piece of lemon, we make use of muscular force to extract its juice. This muscular force acts on the lemon. As
a result, the shape of the lemon gets changed.

(b) We use our muscular force to take out paste from a toothpaste tube. The muscular force acts on the toothpaste tube. As a
result, the shape of the tube gets changed.

(c) Here, the suspended load exerts a force on the spring and pushes the spring downwards. As a result, the spring gets
stretched. Hence, its shape gets changed.

(d) An athlete pushes the ground with his feet. His feet exert a muscular force on the ground. This allows him to jump over the 
bar. As a result, his state of motion gets changed. Share

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5/22/22, 5:34 PM NCERT Solutions for Class 8 Science Chapter 11 - Force And Pressure

Page No 143:

Question 6:

A
blacksmith hammers a hot piece of iron while making a tool. How does
the force due to hammering affect the piece of iron?

ANSWER:

When
a blacksmith hammers a hot piece of iron, he uses his
muscular force. This muscular force changes the shape of the iron
so
that it can be given a desired shape.

Page No 143:

Question 7:

An
inflated balloon was pressed against a wall after it has been rubbed
with a piece of synthetic cloth. It was found that the
balloon sticks
to the wall. What force might be responsible for the attraction
between the balloon and the wall?

ANSWER:

On
rubbing an inflated balloon with a piece of
synthetic cloth, it becomes charged. A charged body attracts an
uncharged body.
When this charged balloon is pressed against a wall,
it sticks to the wall. The force acting between the charged balloon
and the
wall is the electrostatic force.

Page No 143:
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Question 8: Share

Name the
forces acting on a plastic bucket containing water held above ground
level in your hand. Discuss why the forces acting
on the bucket do
not bring a change in its state of motion.

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5/22/22, 5:34 PM NCERT Solutions for Class 8 Science Chapter 11 - Force And Pressure

ANSWER:

We
make use of muscular force to hold a bucket of water above the
ground. This muscular force acts against the force of gravity
that
pulls the bucket towards the ground. The two forces are equal in
magnitude but opposite in direction. Therefore, the net
force on the
bucket is zero. Hence, there is no change in its state of motion.

Page No 143:

Question 9:

A rocket
has been fired upwards to launch a satellite in its orbit. Name the
two forces acting on the rocket immediately after
leaving the
launching pad.

ANSWER:

The
two forces acting on the rocket are the
force of gravity, which pulls the rocket towards the ground, and the
force of friction
due to earth’s atmosphere, which opposes its
motion.

Page No 143:

Question 10:

When we
press the bulb of a dropper with its nozzle kept in water, air in the
dropper is seen to escape in the form of bubbles.
Once we release the
pressure on the bulb, water gets filled in the dropper. The rise of
water in the dropper is due to

(a) pressure
of water. 
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(b) gravity
of the earth.

(c) shape
of rubber bulb

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5/22/22, 5:34 PM NCERT Solutions for Class 8 Science Chapter 11 - Force And Pressure

(d) atmospheric
pressure

ANSWER:

(d)
The rise of water in the dropper is due to atmospheric pressure.

The
rise of water in a dropper is due to
atmospheric pressure. When all the air escapes from the nozzle, the
atmospheric
pressure, which is acting on the water, forces the water
to fill the nozzle of the dropper.

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