Class 6th Science Ch 5 Measurement of Length and Motion

📘 Class 6 Science – Chapter 5: Measurement of Length and Motion

1. Match the lengths with the units suitable for measuring those lengths.

• 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).

• (i) The motion of a car moving on a straight road is an example of linear motion. — True
• (ii) Any object which is changing its position with respect to a reference point with time is said to be in motion. — True
• (iii) 1 km = 100 cm — False

3. Which of the following is not a standard unit of measuring length?

(i) millimetre (ii) centimetre (iii) kilometre (iv) handspan
Answer: (iv) handspan – it is not standard because it varies from person to person.

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.

Activity: Find 2–3 different rulers or measuring tapes. Note the smallest value marked (e.g. 1 mm or 0.5 mm). Create a table with “Scale Type” and “Smallest Value Measured”.

5. Suppose the distance between your school and home is 1.5 km. Express it in metres.

Answer: 1.5 km = 1500 metres (since 1 km = 1000 m)

6. Take a tumbler or a bottle. Measure the length of the curved part of the base of glass or bottle and record it.

Activity: Take a thread and wrap it around the curved base of the bottle. Then straighten the thread and measure its length using a scale. Record the length in cm.

7. Measure the height of your friend and express it in (i) metres (ii) centimetres and (iii) millimetres.

Activity: Measure your friend’s height. For example: Height is 1.3 metres.
(i) In metres: 1.3 m
(ii) In centimetres: 130 cm
(iii) In millimetres: 1300 mm

8. Estimate how many coins are required to cover the length of your notebook. Verify by measuring both the coin and notebook using a 15-cm scale.

I estimated that about 14 coins would be needed to cover the notebook side.
Then I measured and found the notebook is 28 cm long, and one coin is 2 cm.
So, 28 ÷ 2 = 14 coins. My estimate was correct!

9. Give two examples each for linear, circular and oscillatory motion.

• Linear motion: A car on a straight road, Students in a march-past
• Circular motion: A merry-go-round, Whirling an eraser tied to a thread
• Oscillatory motion: A swing, An eraser hanging from a thread

10. Observe different objects around you and classify their lengths in mm, cm, or m.

Activity: List 3 objects in each category:
Millimetre (mm): Thickness of a page, needle, button
Centimetre (cm): Eraser, pen, small box
Metre (m): Height of a door, length of a room, school corridor

11. A ball on a rollercoaster track moves from A to F. Identify the types of motion.

• The ball has linear motion on straight parts of the track.
• The ball has circular motion on curved parts of the track.

12. Tasneem wants to make a metre scale. Which material should she not use and why?

She should not use stretchable rubber because it can stretch and give different measurements each time. A scale must be rigid to be accurate.

13. Think, design and develop a card game on conversion of units of length to play with your friends.

Activity: Make small cards with questions like "Convert 100 cm to m" and answers on the back. Shuffle and play with friends. Get points for every correct answer.