NCERT Textbook: Measurement of Length and Motion

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Measurement of Length
and Motion
5
Chapter
Deepa, a curious eleven-year old girl, lives in a
town of the state of Haryana. The new school
year has started. Deepa needs a new uniform
since she has grown taller. Her mother takes
her to a cloth shop. She asks for a two-metre
cloth piece. The shopkeeper measures the
cloth using a metal measuring rod.
Then, the tailor takes her measurements
using a flexible measuring tape. Her mother
instructs the tailor to increase the length of her
uniform by char angula (four fingers width).
Are
the tape and rod
similar to the scale that the
elder sister has in her geometry
box? What did mother mean
by char angula?
Deepa shares her experience with her school friends
Anish, Hardeep, Padma, Tasneem and this leads to a
discussion amongst them.
Chapter 5.indd   79 10-07-2024   14:28:57
Page 2

Measurement of Length
and Motion
5
Chapter
Deepa, a curious eleven-year old girl, lives in a
town of the state of Haryana. The new school
year has started. Deepa needs a new uniform
since she has grown taller. Her mother takes
her to a cloth shop. She asks for a two-metre
cloth piece. The shopkeeper measures the
cloth using a metal measuring rod.
Then, the tailor takes her measurements
using a flexible measuring tape. Her mother
instructs the tailor to increase the length of her
uniform by char angula (four fingers width).
Are
the tape and rod
similar to the scale that the
elder sister has in her geometry
box? What did mother mean
by char angula?
Deepa shares her experience with her school friends
Anish, Hardeep, Padma, Tasneem and this leads to a
discussion amongst them.
Chapter 5.indd   79 10-07-2024   14:28:57
Curiosity | Textbook of Science | Grade 6
80
5.1 How do we Measure?
Hardeep says, “I have seen my grandmother measuring
cloth by the length of her arm.”
“Have you ever seen how a farmer measures length to
divide his field into beds? He walks and counts the number
of his strides,” says Padma.
“Oh, not just the length of the strides—sometimes they
also use the length of their feet to measure,” adds Anish.
Deepa says excitedly, “Measuring length using body parts
must be so much fun! Let us also measure something using
a body part.”
“What should we measure? Okay, let us
measure the length of the table in our classroom,”
says Tasneem.
Padma adds, “And which body part should
we use to measure it?”
Deepa says, “Let us use our handspan. I will
show you how to use it. I have seen my mother
using it. She calls it balisht.”
Hardeep adds, “Okay. Let us also note down
our measurements.”
Fig. 5.1: Use of handspan
for measuring
Deepa
Padma
Tasneem
Anish
Hardeep
Chapter 5.indd   80 10-07-2024   14:28:58
Page 3

Measurement of Length
and Motion
5
Chapter
Deepa, a curious eleven-year old girl, lives in a
town of the state of Haryana. The new school
year has started. Deepa needs a new uniform
since she has grown taller. Her mother takes
her to a cloth shop. She asks for a two-metre
cloth piece. The shopkeeper measures the
cloth using a metal measuring rod.
Then, the tailor takes her measurements
using a flexible measuring tape. Her mother
instructs the tailor to increase the length of her
uniform by char angula (four fingers width).
Are
the tape and rod
similar to the scale that the
elder sister has in her geometry
box? What did mother mean
by char angula?
Deepa shares her experience with her school friends
Anish, Hardeep, Padma, Tasneem and this leads to a
discussion amongst them.
Chapter 5.indd   79 10-07-2024   14:28:57
Curiosity | Textbook of Science | Grade 6
80
5.1 How do we Measure?
Hardeep says, “I have seen my grandmother measuring
cloth by the length of her arm.”
“Have you ever seen how a farmer measures length to
divide his field into beds? He walks and counts the number
of his strides,” says Padma.
“Oh, not just the length of the strides—sometimes they
also use the length of their feet to measure,” adds Anish.
Deepa says excitedly, “Measuring length using body parts
must be so much fun! Let us also measure something using
a body part.”
“What should we measure? Okay, let us
measure the length of the table in our classroom,”
says Tasneem.
Padma adds, “And which body part should
we use to measure it?”
Deepa says, “Let us use our handspan. I will
show you how to use it. I have seen my mother
using it. She calls it balisht.”
Hardeep adds, “Okay. Let us also note down
our measurements.”
Fig. 5.1: Use of handspan
for measuring
Deepa
Padma
Tasneem
Anish
Hardeep
Chapter 5.indd   80 10-07-2024   14:28:58
Measurement of Length and Motion
81
Padma says, “Oh, the number of handspans is different for
all of us. So, what can we say about the length of the table?”
“But why should the number be different?” Hardeep
asked thoughtfully.
Tasneem says, “I can guess. Our handspans are of
different sizes.”
Anish gives an idea, “Let us check this.”
So, all five of them put their handspans along each
other and arrive at the conclusion that the lengths of their
handspans are different.
Deepa says thoughtfully, “No wonder people use scales
and measuring tapes.”
Deepa and her friends compare the length of the table
with the length of their handspans. The length of the table is
expressed in terms of their handspans. Here, the handspan
used for measurement is an example of a unit. And the length
is expressed in two parts, a number and a unit. For example,
if the length of the table is found to be 13 handspans, then
13 is the number and ‘handspan’ is the unit selected for the
measurement.
However, handspans and other similar units, such as
length of hand, foot, fist or fingers, differ from person to
person. Thus, there is a need for such a unit for which
measurements of the same length made by different people
do not differ .
Table 5.1: Measuring the length of the table
Name of the Student Number of Handspans
Anish Slightly more than 13
Padma 13
Tasneem Slightly less than 13
Deepa Between 13 and 14
Hardeep 14
Chapter 5.indd   81 10-07-2024   14:28:58
Page 4

Measurement of Length
and Motion
5
Chapter
Deepa, a curious eleven-year old girl, lives in a
town of the state of Haryana. The new school
year has started. Deepa needs a new uniform
since she has grown taller. Her mother takes
her to a cloth shop. She asks for a two-metre
cloth piece. The shopkeeper measures the
cloth using a metal measuring rod.
Then, the tailor takes her measurements
using a flexible measuring tape. Her mother
instructs the tailor to increase the length of her
uniform by char angula (four fingers width).
Are
the tape and rod
similar to the scale that the
elder sister has in her geometry
box? What did mother mean
by char angula?
Deepa shares her experience with her school friends
Anish, Hardeep, Padma, Tasneem and this leads to a
discussion amongst them.
Chapter 5.indd   79 10-07-2024   14:28:57
Curiosity | Textbook of Science | Grade 6
80
5.1 How do we Measure?
Hardeep says, “I have seen my grandmother measuring
cloth by the length of her arm.”
“Have you ever seen how a farmer measures length to
divide his field into beds? He walks and counts the number
of his strides,” says Padma.
“Oh, not just the length of the strides—sometimes they
also use the length of their feet to measure,” adds Anish.
Deepa says excitedly, “Measuring length using body parts
must be so much fun! Let us also measure something using
a body part.”
“What should we measure? Okay, let us
measure the length of the table in our classroom,”
says Tasneem.
Padma adds, “And which body part should
we use to measure it?”
Deepa says, “Let us use our handspan. I will
show you how to use it. I have seen my mother
using it. She calls it balisht.”
Hardeep adds, “Okay. Let us also note down
our measurements.”
Fig. 5.1: Use of handspan
for measuring
Deepa
Padma
Tasneem
Anish
Hardeep
Chapter 5.indd   80 10-07-2024   14:28:58
Measurement of Length and Motion
81
Padma says, “Oh, the number of handspans is different for
all of us. So, what can we say about the length of the table?”
“But why should the number be different?” Hardeep
asked thoughtfully.
Tasneem says, “I can guess. Our handspans are of
different sizes.”
Anish gives an idea, “Let us check this.”
So, all five of them put their handspans along each
other and arrive at the conclusion that the lengths of their
handspans are different.
Deepa says thoughtfully, “No wonder people use scales
and measuring tapes.”
Deepa and her friends compare the length of the table
with the length of their handspans. The length of the table is
expressed in terms of their handspans. Here, the handspan
used for measurement is an example of a unit. And the length
is expressed in two parts, a number and a unit. For example,
if the length of the table is found to be 13 handspans, then
13 is the number and ‘handspan’ is the unit selected for the
measurement.
However, handspans and other similar units, such as
length of hand, foot, fist or fingers, differ from person to
person. Thus, there is a need for such a unit for which
measurements of the same length made by different people
do not differ .
Table 5.1: Measuring the length of the table
Name of the Student Number of Handspans
Anish Slightly more than 13
Padma 13
Tasneem Slightly less than 13
Deepa Between 13 and 14
Hardeep 14
Chapter 5.indd   81 10-07-2024   14:28:58
Curiosity | Textbook of Science | Grade 6
82
India has a rich history of measurement
systems dating back to ancient times. Angula
(finger width), multiples of angula, dhanusa,
and yojana are some of the units mentioned
in ancient Indian literature, and used in
measuring artefacts, architecture, and
town planning. The angula is still used by
traditional craftspeople like carpenters
and tailors. Several objects with ruled
markings which could be scales have been
excavated from sites of the Harappan
Civilisation.
More to
know!
Fig. 5.2:
A metre scale
5.2 Standard Units
Several systems of units evolved with time in
different parts of the world. However , when
people started travelling from one place to
another, it created a lot of confusion. This led
to the different countries coming together
and adopting a set of standard units of
measurement. The system of units now used is
known as the ‘International System of Units’ or
SI units.
The SI unit of length is metre. Its symbol
is  m. A metre scale is shown in Fig. 5.2. One
metre (m) is divided into 100 equal divisions.
Each division is called a centimetre (cm). You
may be familiar with a smaller part of the
metre scale, typically 15 cm long, shown in
Fig. 5.3.
Look carefully at the 15-cm scale. It has
markings (in  cm) from 0 to 15. The length
of any section between two consecutive big
marks, such as between 1 and 2 or between
5 and 6, is 1  cm. Observe that these sections
Chapter 5.indd   82 10-07-2024   14:29:13
Page 5

Measurement of Length
and Motion
5
Chapter
Deepa, a curious eleven-year old girl, lives in a
town of the state of Haryana. The new school
year has started. Deepa needs a new uniform
since she has grown taller. Her mother takes
her to a cloth shop. She asks for a two-metre
cloth piece. The shopkeeper measures the
cloth using a metal measuring rod.
Then, the tailor takes her measurements
using a flexible measuring tape. Her mother
instructs the tailor to increase the length of her
uniform by char angula (four fingers width).
Are
the tape and rod
similar to the scale that the
elder sister has in her geometry
box? What did mother mean
by char angula?
Deepa shares her experience with her school friends
Anish, Hardeep, Padma, Tasneem and this leads to a
discussion amongst them.
Chapter 5.indd   79 10-07-2024   14:28:57
Curiosity | Textbook of Science | Grade 6
80
5.1 How do we Measure?
Hardeep says, “I have seen my grandmother measuring
cloth by the length of her arm.”
“Have you ever seen how a farmer measures length to
divide his field into beds? He walks and counts the number
of his strides,” says Padma.
“Oh, not just the length of the strides—sometimes they
also use the length of their feet to measure,” adds Anish.
Deepa says excitedly, “Measuring length using body parts
must be so much fun! Let us also measure something using
a body part.”
“What should we measure? Okay, let us
measure the length of the table in our classroom,”
says Tasneem.
Padma adds, “And which body part should
we use to measure it?”
Deepa says, “Let us use our handspan. I will
show you how to use it. I have seen my mother
using it. She calls it balisht.”
Hardeep adds, “Okay. Let us also note down
our measurements.”
Fig. 5.1: Use of handspan
for measuring
Deepa
Padma
Tasneem
Anish
Hardeep
Chapter 5.indd   80 10-07-2024   14:28:58
Measurement of Length and Motion
81
Padma says, “Oh, the number of handspans is different for
all of us. So, what can we say about the length of the table?”
“But why should the number be different?” Hardeep
asked thoughtfully.
Tasneem says, “I can guess. Our handspans are of
different sizes.”
Anish gives an idea, “Let us check this.”
So, all five of them put their handspans along each
other and arrive at the conclusion that the lengths of their
handspans are different.
Deepa says thoughtfully, “No wonder people use scales
and measuring tapes.”
Deepa and her friends compare the length of the table
with the length of their handspans. The length of the table is
expressed in terms of their handspans. Here, the handspan
used for measurement is an example of a unit. And the length
is expressed in two parts, a number and a unit. For example,
if the length of the table is found to be 13 handspans, then
13 is the number and ‘handspan’ is the unit selected for the
measurement.
However, handspans and other similar units, such as
length of hand, foot, fist or fingers, differ from person to
person. Thus, there is a need for such a unit for which
measurements of the same length made by different people
do not differ .
Table 5.1: Measuring the length of the table
Name of the Student Number of Handspans
Anish Slightly more than 13
Padma 13
Tasneem Slightly less than 13
Deepa Between 13 and 14
Hardeep 14
Chapter 5.indd   81 10-07-2024   14:28:58
Curiosity | Textbook of Science | Grade 6
82
India has a rich history of measurement
systems dating back to ancient times. Angula
(finger width), multiples of angula, dhanusa,
and yojana are some of the units mentioned
in ancient Indian literature, and used in
measuring artefacts, architecture, and
town planning. The angula is still used by
traditional craftspeople like carpenters
and tailors. Several objects with ruled
markings which could be scales have been
excavated from sites of the Harappan
Civilisation.
More to
know!
Fig. 5.2:
A metre scale
5.2 Standard Units
Several systems of units evolved with time in
different parts of the world. However , when
people started travelling from one place to
another, it created a lot of confusion. This led
to the different countries coming together
and adopting a set of standard units of
measurement. The system of units now used is
known as the ‘International System of Units’ or
SI units.
The SI unit of length is metre. Its symbol
is  m. A metre scale is shown in Fig. 5.2. One
metre (m) is divided into 100 equal divisions.
Each division is called a centimetre (cm). You
may be familiar with a smaller part of the
metre scale, typically 15 cm long, shown in
Fig. 5.3.
Look carefully at the 15-cm scale. It has
markings (in  cm) from 0 to 15. The length
of any section between two consecutive big
marks, such as between 1 and 2 or between
5 and 6, is 1  cm. Observe that these sections
Chapter 5.indd   82 10-07-2024   14:29:13
Measurement of Length and Motion
83
Fig. 5.3: A 15-cm scale
of 1  cm length are further divided
into 10 equal parts. The length of
one of these smaller parts is called
a millimetre (mm). 1 mm is the
smallest value of length that you
can measure using this scale. 1 mm
is equal to one-tenth of a centimeter
(1 mm = 0.1 cm).
For measuring larger lengths, we
use a larger unit called a kilometre
(km) which is equal to 1000 metres.
And for measuring smaller lengths,
we use units such as centimetre or
millimetre.
1 km = 1000 m 1 m = 100 cm 1 cm = 10 mm
Would it be convenient to use
the unit metre to measure
larger lengths, such as the
length of a railway track
between two cities, or to
measure smaller lengths,
such as the thickness of a
page of a book?
?
In some scales, you might have noticed another scale
marking. This scale marking is in inches, where
1 inch = 2.54 cm. In earlier days, units, such as inch and foot,
were used to measure length. These units are still used by
some people.
Do you
know?
Chapter 5.indd   83 10-07-2024   14:29:23
```

## Science Class 6

99 videos|260 docs|49 tests

## FAQs on NCERT Textbook: Measurement of Length and Motion - Science Class 6

 1. How can we measure length accurately?
Ans. To measure length accurately, we can use instruments such as rulers, measuring tapes, or meter sticks. Place one end of the measuring instrument at the starting point of the object to be measured and then read the measurement at the other end.
 2. What is the difference between distance and displacement?
Ans. Distance is the total length of the path covered between two points, while displacement is the shortest distance between the initial and final points, including direction.
 3. Can we measure the length of curved objects using a ruler?
Ans. No, rulers are designed for measuring straight lengths. To measure the length of curved objects accurately, we can use a measuring tape or a flexible curve ruler.
 4. How can motion be measured?
Ans. Motion can be measured by calculating the distance covered by an object in a specific time period or by measuring the speed at which the object is moving.
 5. Why is it important to measure length accurately in various fields?
Ans. Accurate measurement of length is crucial in fields such as construction, engineering, and science, as it ensures precision and consistency in designing and building structures, conducting experiments, and analyzing data.

## Science Class 6

99 videos|260 docs|49 tests

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