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Solutions to ‘Let us enhance our learning’ (Page No 97) of NCERT Class 6 Science Curiosity Chapter 5 Measurement of Length and Motion
1. Some lengths are given in Column I of Table 5.5. Some units are given in Column II. Match the lengths with the units suitable for measuring those lengths.
Table 5.5
| Column I | Column II |
| Distance between Delhi and Lucknow | centimetre |
| Thickness of a coin | kilometre |
| Length of an eraser | metre |
| Length of school ground | millimetre |
Solution:
The correct table is shown below:
| Column I | Column II |
| Distance between Delhi and Lucknow | kilometre |
| Thickness of a coin | millimetre |
| Length of an eraser | centimetre |
| Length of school ground | metre |
2. Read the following statements and mark True (T) or False (F) against each.
(i) The motion of a car moving on a straight road is an example of linear motion. [ ]
(ii) Any object which is changing its position with respect to a reference point with time is said to be in motion. [ ]
(iii) 1 km = 100 cm [ ]
Solution:
(i) True (T). Since the car moves in a straight line, it is an example of linear motion.
(ii) True (T).
(iii) False (F). 1 km = 1000 m and 1 m = 100 cm. Therefore, 1 km = 1000 × 100 cm = 100000 cm.
3. Which of the following is not a standard unit of measuring length?
(i) millimetre (ii) centimetre (iii) kilometre (iv) handspan
Solution: (iv) handspan
Handspan cannot be used as a standard unit of measuring length because length of handspan varies from person to person. Therefore, each person will obtain different values for a certain fixed length in terms of the unit ‘handspan’.
4. Search for the different scales or measuring tapes at your home and school. Find out the smallest value that can be measured using each of these scales. Record your observations in a tabular form.
Solution:
| Scale/Measuring Tape | Smallest Value that can be Measured |
| Wooden metre scale | 1 mm |
| 15 cm plastic scale | 1 mm |
| Steel measuring tape with spring | 1 mm |
5. Suppose the distance between your school and home is 1.5 km. Express it in metres.
Solution:
1 km = 1000 metre
1.5 km = 1.5 × 1000 metres = 1500 metres
6. Take a tumbler or a bottle. Measure the length of the curved part of the base of glass or bottle and record it.
Solution:
A flexible measuring tape, such as a tailor’s tape is suitable for measuring the length of the curved part of the base of glass or bottle.
Another method is to wrap a string around the curved part of the base, marking where the string meets the starting point. Then the string can be straightened and the length can be measured with a ruler.
The length will depend on the specific tumbler or bottle you choose.
7. Measure the height of your friend and express it in (i) metres (ii) centimetres and (iii) millimetres.
Solution:
To measure the height of your friend, follow the steps below:
(i) Ask your friend to stand against the wall of your classroom
(ii) Mark his height on the wall holding a ruler horizontally over the top of this head.
(iii) Read off the height using a measuring tape.
The height of the friend was 1.65 metres.
1 metre = 100 cm
1.65 metres = 1.65 × 100 cm = 165 cm
1 cm = 10 millimetre
165 cm = 165 × 10 millimetre = 1650 millimetres
Height expressed in (i) metres = 1.65 metres.
Height expressed in (ii) centimetres = 165 metres.
Height expressed in (iii) millimetres = 1650 millimetres.
8. You are given a coin. Estimate how many coins are required to be placed one after the other lengthwise, without leaving any gap between them, to cover the whole length of the chosen side of a notebook. Verify your estimate by measuring the same side of the notebook and the size of the coin using a 15-cm scale.
Solution:
Estimation:
To estimate how many coins are required to be placed one after the other lengthwise we follow the steps below:
(i) Place the coin at one end of the length of the notebook and mark the point where the coin ends as point 1.
(ii) Then place the same coin at point 1 and mark the point where it ends as 2.
(iii) Repeat the process until you reach the opposite end of the length of the notebook.
(iv) Count the number of marks you made. This number will be the number of coins needed.
It is estimated that 10 coins were required to be placed one after the other lengthwise to cover the whole length of the side of the notebook.
Verification:
The length of the notebook was measured using a 15-cm scale to be 20 cm.
The size of the coin was measured to be 2 cm.
Therefore, the number of coins needed = 20/2 = 10.
Hence, our estimation was accurate.
9. Give two examples each for linear, circular and oscillatory motion.
Solution:
Linear Motion Examples: Athlete running on a straight track, stone falling towards the ground.
Circular Motion Examples: Boy sitting on a rotating merry-go-round, stone tied to one end of a string and whirled around.
Oscillatory motion Examples: Children sitting on a seesaw, pendulum.
10. Observe different objects around you. It is easier to express the lengths of some objects in mm, some in cm and some in m. Make a list of three objects in each category and enter them in the Table 5.6.
Table 5.6: Sizes of objects around us
| Size | Objects |
| mm | |
| cm | |
| m |
Solution:
Table 5.6: Sizes of objects around us
| Size | Objects |
| mm | (i) Thickness of a coin (ii) Thickness of a button (iii) Width of a small screw |
| cm | (i) Length of a smartphone (ii) Length of a pen (iii) Width of a laptop screen |
| m | (i) Width of a car (ii) Height of a refrigerator (iii) Length of a dining table |
11. A rollercoaster track is made in the shape shown in Fig. 5.19. A ball starts from point A and escapes through point F. Identify the types of motion of the ball on the rollercoaster and corresponding portions of the track.
Solution:
The types of motion of the ball on the rollercoaster and corresponding portions of the track are identified below:
Point A – Point B: Linear Motion. The ball moves along a straight line in this section.
Point B – Point C: Non-linear Motion. The ball moves in a curved path in this section.
Point C – Point E: Circular Motion. The ball moves in a circular path in this section.
Point E – Point F: Linear Motion. The ball moves along a straight line in this section.
12. Tasneem wants to make a metre scale by herself. She considers the following materials for it—plywood, paper, cloth, stretchable rubber and steel. Which of these should she not use and why?
Solution:
Tasneem should not use paper, cloth and stretchable rubberto make the metre scale.
Paper and cloth are not durable and can easily tear, wrinkle or get bent out of shape, thereby giving wrong measurements. Stretchable rubber can change its length when stretched, leading to inaccurate measurements.
She should use plywood or steel as they are rigid, durable, and maintain a consistent length. This would give us accurate measurements every single time.
13. Think, design and develop a card game on conversion of units of length to play with your friends.
Solution:
Card Game: “Length Match”
Objective:
To match pairs of equivalent lengths expressed in different units. The player with the most pairs wins.
Procedure:
(i) Prepare 60 Length cards with different lengths expressed in various units, namely millimetres (mm), centimetres (cm), meters (m), kilometres (km). Some examples of such cards are: 1 cm, 10 mm, 1 m, 100 cm, 1 km, etc.
(ii) Shuffle the Length Cards.
(iii) Deal all cards equally to each player. Each player should keep their cards in a stack, face down.
(iv) Players sit in a circle and take turns flipping one card from their stack and placing it in the centre, creating a face-up pile.
(v) When two cards showing equivalent lengths (e.g., 10 cm and 100 mm) appear consecutively in the centre pile, players recognise the equivalence and shout “Match!”
(vi) The first player to shout “Match!” wins the centre pile and adds it to their stack.
(vii) The game continues with each player taking turns to flip cards. The player with the most cards after a set time, say 1 hour, is the winner of the game!
Have fun!
Examples of Equivalent Pairs:
1 km and 1000 m
20 cm and 200 mm
1 m and 100 cm
1 km and 100000 cm
Solutions to In Text Questions of NCERT Class 6 Science Curiosity Chapter 5 Measurement of Length and Motion
1. (Page 79) 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?
Answer:
The tape is similar to the geometry box scale in that the markings are the same and dissimilar to the scale in that the tape is flexible and can be used to measure curved lengths. The metal rod is similar to the scale in that they are both rigid and have the same markings and dissimilar in that the metal rod is longer. By char angula her mother meant a width of four fingers, held right next to each other without any gap between them.
2. (Page 83) 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?
Answer:
No, it would not be convenient to use the unit metre to measure the length of a railway track between two cities because it is too small for the purpose. The unit metre would also not be convenient to measure smaller lengths, such as the thickness of a page of a book because it is too large for the purpose.
3. (Page 84) Suppose we all measure the length of the table again, but this time using a metre scale. Will our results still be different?
Answer:
No, our results will be the same because the metre scale is of fixed length.
4. (Page 86) Why are some length measuring devices made up of flexible materials?
Answer:
Some length measuring devices are made of flexible materials to allow for the measurement of objects with curves, angles, and irregular shapes.
5. (Page 89) What do such kilometre stones indicate? How could Padma conclude that she was getting closer to her destination?
Answer:
Kilometre stones indicate the distance of a place from the position of the stone. Padma could conclude that she was getting closer to her destination because the number on the kilometre stone would decrease.
6. (Page 89) Does this mean that the position of Padma, with respect to the reference point, is changing with time? When does the position of an object change with respect to a reference point? Does it change when an object is moving?
Answer:
Yes, it means that the position of Padma, with respect to the reference point, is changing with time.The position of an object changes with respect to a reference point when an object is moving. When an object is moving it is said to be in motion.
7. (Page 91) Suppose you are travelling on a ship which is moving at a constant speed along a straight line on a calm sea. Suppose there is no window on the ship. Is there any way that you can determine whether the ship is moving or is stationary?
Answer:
No, you cannot determine whether the ship is moving or is stationary because you can only use yourself or the insides of the ship as the reference point. There is no external reference point to determine whether the ship is in motion.
Extra Questions to Complement Solutions to NCERT Class 6 Science Curiosity Chapter 5 Measurement of Length and Motion
Very Short Answer Type Questions:
1. Name a precise and correct way to measure length.
Answer:
A precise and correct way to measure length is to use the scale in your geometry box.
2. What is 1 km expressed in m?
Answer:
1 km = 1000 m
3. How do you measure the length of your pencil?
Answer:
You can use a 15 cm scale to measure the length of your pencil.
4. Can a metre scale be suitable for measuring huge distances?
Answer:
No, a metre scale is too small for measuring huge distances.
5. Name a kind of motion that happens inside our bodies.
Answer:
The flow of blood inside our own bodies is a kind of motion that happens inside our bodies.
6. Can you stop a body that was in motion?
Answer:
Yes, you can stop a body that is in motion.
7. What is the SI unit of length?
Answer:
The SI unit of length is metre.
Short Answer Type Questions:
1. Why do we need different forms of transport?
Answer:
We need different forms of transport because distances vary. Some distances are small enough to be covered on foot while other must be covered by car. Some distances cannot be covered by certain forms of transport. For example, you must cross oceans by ship or aeroplane – it is not possible to cover it on foot.
2. What is the problem of measuring length with a set of gilli and danda?
Answer:
The problem is that one cannot measure lengths which are smaller than a gilli by using a set of gilli and danda. Besides, the gilli dandas are not a standard unit of measurement, so the results obtained would vary if a different set of gilli danda was used to measure the same length. Therefore, we cannot get an accurate measurement.
3. What is the difference between measuring lengths using your foot and handspan and a scale?
Answer:Everyone’s foot and handspan are of different lengths. The length you measure using your foot and handspan will be different than the length your friend measures. Therefore, they cannot be used as standard units of measurement. A scale on the other hand, is fixed in length no matter who uses it. Therefore, it can be used as a standard unit of measurement and can give you accurate measurements every single time.
4. Express the following in millimetre.
(a) 1 m (b) 1 cm
Answers:
(a) 1 m
1m = 1000 mm
(b) 1 cm
1 cm = 10 mm
5. Is a metre scale suitable for all types of measurements?
Answer:
No, a metre scale is not suitable for all types of measurements. For example, you must choose a suitable device like a measuring tape to measure the girth of a tree of the size of your chest. A metre scale would not be suitable for these measurements.
6. What are two uses of measurement devices?
Answer:
Using measurement devices we can do the following:
(i) We measure distances
(ii) We convey these results to others.
7. What is motion?
Answer:
Motion is the change in the position of an object with time. For example, if a crow flies from one place to another, it is said to be in motion.
8. What is rectilinear motion?
Answer:When objects move in a straight line, they are said to undergo rectilinear motion. For example, when sprinters run in 100-metre race the motion they undergo is said to be rectilinear motion.
9. What is circular motion?
Answer:
When an object moves in perfectly circular fashion it is said to be circular motion. When an electric fan in turned on the blade moves round and round. The blades are said to be in circular motion.
10. What is periodic motion?
Answer:
Periodic motion is when an object repeats its motion after some time. For example, a pendulum repeats its motion periodically – it keeps going left, then right and then left again.
11. Name a situation which has rectilinear motion as well as rotational motion?
Answer:When a ball rolls on the ground, it rotates as well as moves forward. Therefore, the ball undergoes rectilinear as well as rotational motion.
12. To a person standing on Earth, the planet Earth does not seem to move. Is it at rest?
Answer:
The planet earth is in motion. We are on the planet Earth and moving along with it, so it seems at rest to us. However, the planet Earth is in continuous motion around the Sun, taking the Sun to be the reference point.
13. Are circular motions periodic? What about the opposite?
Answer:All circular motions are periodic because circular motions get repeated. Periodic motions repeat themselves but just like the motion of pendulum, they need not always be circular. So, all circular motions are periodic, but all periodic motions are not circular.
Long Answer Type Questions:
1. How did you measure length using a string?
Answer:
Here the steps you must follow to measure length using a string:
(i) Take a small length of string and mark two points on it. This will be a string length.
(ii) Then you can measure the length of the object to be measured in string lengths.
(iii) To measure lengths less than the length of the string, you can fold the string into smaller string lengths for example ,
and
‘string lengths’ and use them to measure the smaller distances.
2. How to measure the length of a curved line?
Answer:
You can measure a curved line using a thread. This is how:
(i) Put a knot at one end of the thread and place the knot at one end of the curved line.
(ii) Place a small portion of the thread along the line, keeping it taut using your fingers and thumb.
(iii) Then, hold the thread at the end point with one hand.
(iv) Using the other hand, stretch a little more portion of the thread along the curved line.
(v) Repeat the process until the other end of the curved line is reached.
(vi) Make a mark on the thread where it touches the extreme end of the line.
(vii) Now stretch the full length of the thread along a metre scale.
(viii) Measure the length between the knot in the beginning and the final mark on the thread. This is the required length of the curved line.
3. Name some objects which are moving but are overall in the same place.
Answer:
Some objects which are moving in the same place:
(i) A clock – Its hands move, but the clock does not.
(ii) A sewing machine – The needle of a sewing machine moves up and down continuously, but the sewing machine does not move.
(iii) An electric fan – The blades of the fan rotate, but the fan does not move.
(iv) A pendulum – A pendulum swings from side to side, but it does not move overall.
(v) A branch – A branch of a tree moves to and fro, but it does not move overall.
(vi) Swing – A swing moves back and forth, but it does not move overall.
(vii) Strings of a guitar – The strings of guitar vibrate, but it does not move overall.
4. How do you measure a length using a scale?
Answer:
This is how you measure a length using a scale:
(i) Place the length in contact with the object along its length as shown in figure (a) below.
(ii) If the scale is broken or if you cannot see the zero mark clearly – you do not start measuring from the broken edge or the zero mark of the scale. You can use another full mark, for example 2.0 cm. In the picture below we have started from 1.0 cm.
(iii) Then you subtract the initial reading from the reading at the other end.
(iv) The position of the eye must be vertically above the point where the measurement is taken. If your eye is positioned to one side, then the reading will be incorrect. This is known as parallax error.
Fill in the blanks:
rotational, circular, wrong, motion, 500
(a) When a body moves it is set to be in _________.
(b) When reading off a scale, if your eyes are to one side instead of above the reading, then you will get the _________ reading.
(c) _________ motion is the motion undergone when a Earth rotates about its axis.
(d) 50 cm = _________ mm.
(e) A merry-go-round is in _________ motion.
Answer:
(a) When a body moves it is set to be in motion.
(b) When reading off a scale, if your eyes are to one side instead of above the reading, then you will get the wrong reading.
(c) Circular motion is the motion undergone when the Earth rotates about its axis.
(d) 50 cm = 500 mm.
(e) A merry-go-round is in circular motion.
Match and pair:
| Column A | Column B |
| (i) French created a standard unit of measurement | (a) Fixed |
| (ii) Movement of a rolling ball | (b) 1 cm |
| (iii) No change in position with time | (c) Metric system |
| (iv) Reference point | (d) Rest |
| (v) 100 divisions of 1 metre | (e) Rotational and rectilinear motion |
Answer: The correct table is shown below:
| Column A | Column B |
| (i) French created a standard unit of measurement | (c) Metric system |
| (ii) Movement of a rolling ball | (e) Rotational and rectilinear motion |
| (iii) No change in position with time | (d) Rest |
| (iv) Reference point | (a) Fixed |
| (v) 100 divisions of 1 metre | (b) 1 cm |
++++++++++++++
Frequently Asked Questions (FAQs) on NCERT Solutions for Class 6 Science Curiosity Chapter 5 Measurement of Length and Motion
In this complete solutions material, we have thoroughly answered all your questions on the chapter. All the concepts you need to know from this chapter are beautifully explained right here and excellent figures have been included wherever necessary to help you understand the concepts even better. If you study this solutions material in detail and understand all the concepts, you will have mastered the chapter.
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The following topics are covered:
5.1 How do we Measure?
5.2 Standard Units
5.3 Correct Way of Measuring Length
5.4 Measuring the Length of a Curved Line
5.5 Describing Position
5.6 Moving Things
5.7 Types of Motion
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The important concepts of the chapter are understanding the different ways of measurement of length, how to measure length correctly, standard units of measurement and types of motion. Understand the different methods of measurements through the activities and diagrams explained in this solutions material. In the second part of the chapter understand the difference between the different types of motion. For the latter study the extra questions we have included, they will help clear your concepts.
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