🌟 Meet Deepa, an 11-year-old girl from Haryana who needs a new school uniform because she’s grown taller! Let’s join her journey to learn about measurement and motion.
🔍 5.1 How Do We Measure?
👵 Hardeep’s grandma measures cloth using her arm length
👨🌾 Farmers measure fields by counting their footsteps
👩🔬 Let’s Experiment: Measuring with Handspans
Deepa and friends tried measuring their classroom table:
| Student | Handspans |
|---|---|
| Anish | More than 13 |
| Padma | Exactly 13 |
| Deepa | 13-14 |
❓ Why different numbers? Because everyone’s handspan size is different!
📐 5.2 Standard Measurement Units
📏 Metre (m)
1 m = 100 cm = 1000 mm
🏙️ Kilometer (km)
1 km = 1000 m (for long distances)
📏 Centimeter (cm)
1 cm = 10 mm (for small objects)
💡 Fun Fact: Ancient Indians used finger widths (angula) for measurement!
🎯 5.3 How to Measure Correctly
👀 Eye Position Matters!
Always look straight down at the measurement
📏 Broken Scale?
Start from 1 cm mark instead of 0
🛠️ Activity: Measure These!
Try measuring: pencil, eraser, notebook
🌀 5.4 Measuring Curved Lines
For measuring curves (like a slide):
🧵 Use thread → straighten → measure with scale
📍 5.5 Position & Reference Points
🚌 Example: Kilometer stones show distance from Delhi
🏠 Deepa’s friends argued about distances because they used different reference points
🏃 5.6 Motion vs Rest
Motion = Position changes over time
Rest = Position stays same
🚍 On a moving bus:
– You’re at rest relative to the bus
– But in motion relative to trees outside
🔄 5.7 Types of Motion
➡️ Linear Motion
Straight line movement
Example: Falling apple
⭕ Circular Motion
Moving in circles
Example: Merry-go-round
↔️ Oscillatory Motion
To-and-fro movement
Example: Swing
📝 Summary
- 📏 Standard unit: metre (m)
- 1 km = 1000 m; 1 m = 100 cm; 1 cm = 10 mm
- 📍 Need reference points to describe position
- 🏃 Three motion types: linear, circular, oscillatory
🎮 Fun Activities
🌳 Leaf Measurement
Collect leaves → measure length/width → compare!
🚴 Bike Odometer
Count wheel turns to measure distance
📏 Growth Chart
Measure your height every 3 months
🧠 Let Us Enhance Our Learning – Class 6 Science Chapter 5: Measurement and Motion
1. 🧾 Match the Following
Table 5.5 – Match the lengths with suitable units:
| 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. ✅ True or False
- The motion of a car moving on a straight road is an example of linear motion. — True
- Any object which is changing its position with respect to a reference point with time is said to be in motion. — True
- 1 km = 100 cm — False (Correct is 1 km = 1000 m = 100,000 cm)
3. ❓ Multiple Choice Question
Which of the following is not a standard unit for measuring length?
(i) millimetre (ii) centimetre (iii) kilometre (iv) handspan ✅
4. 📏 Observing Measuring Tools
Search for measuring scales or tapes at your home or school. Note down the smallest division marked on each scale.
| Measuring Tool | Smallest Measurement |
|---|---|
| 15 cm ruler | 1 mm |
| Measuring tape (fabric) | 1 mm |
| Metal measuring tape | 1 mm |
5. 🔁 Convert Distance
Distance between school and home = 1.5 km
1 km = 1000 m ⇒ 1.5 km = 1500 metres
6. 🧪 Measure the Base Curve
Take a tumbler or bottle. Wrap a thread around the curved edge of the base. Then straighten the thread and measure its length with a scale. Record the measurement.
7. 📏 Height Measurement
Measure your friend’s height. Express it in:
- Metres: 1.45 m
- Centimetres: 145 cm
- Millimetres: 1450 mm
8. 🪙 Estimating Using Coins
Estimate how many coins will fit along the length of your notebook. Then:
- Measure the notebook side in cm.
- Measure the coin diameter.
- Divide total length by coin length to check your estimate.
9. 🔄 Types of Motion
Linear Motion: Car on a road, falling ball
Circular Motion: Ceiling fan, wheel of a bicycle
Oscillatory Motion: Pendulum, swing
10. 📐 Choose Appropriate Units
List three objects each that are best measured in mm, cm, and m.
| Millimetre (mm) | Centimetre (cm) | Metre (m) |
|---|---|---|
| Coin thickness | Length of pencil | Height of a door |
| Paper thickness | Book width | Room length |
| Hair width | Mobile phone length | School ground |
