Lesson 8 of 9
Track quiz
Show on a big screenSix ideas, six lessons. Use the table if you get stuck.
| Idea | What to remember |
|---|---|
| One agreed length | A standard unit is the same for everyone, everywhere. |
| Choosing a unit | Use the largest unit that still gives 1 or more. |
| Measuring well | Length = far-end reading − near-end reading. |
| Curved lengths | Lay a thread on the curve. Straighten it. Read it on a ruler. |
| Has it moved? | Compare its position with a reference point. |
| Kinds of motion | Name a motion by the shape of its path. |
Two people measure one bench with hand spans. They get 12 and 9. Why do the counts differ?
A ribbon is 1 m long. Measured in mm, is the number more or less than 1?
An ant is 5 mm long. Which unit gives a number of 1 or more?
A pencil starts at 2 cm and ends at 9 cm. How long is it?
How do you measure the curved edge of a bangle?
A bag sits on the seat of a moving bus. Is it in motion?
What kind of motion does the tip of a fan blade have?
Open NCERT Chapter 5, Measurement of Length and Motion, next.
Next: Materials Around Us. Learn what things are made of, and how they behave.
Reveal every answer to finish this lesson.