Solutions-NCERT-Class-6-Science-Curiosity-Chapter-5-Measurement of Length and Motion-CBSE

No, it is not convenient.

• For very large distances, units like kilometre (km) are more suitable.
• For very small lengths, such as the thickness of a book page, units like millimetre (mm) are more suitable.

Some measuring devices are made of flexible materials so that they can measure curved or round objects easily.

Examples:

• Measuring the chest or waist.
• Measuring the girth of a tree.
• Measuring curved surfaces.

No. If the ship is moving at a constant speed in a straight line and there are no windows or outside references, you cannot tell whether the ship is moving or at rest. Without a reference point, it is impossible to determine the motion of the ship.

(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] (1 km = 1000 m)

(iv) handspan 

Observations of different scales or measuring tapes are given below.

1 km = 1000 m

1.5 km = 1.5 x 1000 = 1500 m

Distance between your school and home is 1500 m

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

Answer:

• Method 1 : Take a tailor's measuring tape to measure the length of the curved part of the base of tumbler or bottle.
• Method 2 : Run a thread along the curved part of the base of tumbler or bottle. And the length of the thread used can be further measured from a scale.

Friend's height is 5.5 feet.

(i) 5.5 feet = 5.5 x 0.3 = 1.65 m (since, 1 feet = 0.3 m)

(ii) 1.65 m = 1.65 x 100 = 165 cm (since, 1 m = 100 cm)

(iii) 165 cm = 165 x 10 = 1650 mm (since, 1 cm = 10 mm)

Steps:

Estimate

• Assume the notebook’s side length ≈ 21 cm.
• Coin diameter ≈ 2.4 cm.
• Estimated number of coins = 21/2.4 ≈ 8.75 → about 9 coins.

Verification with 15 cm scale

• Measure notebook side with the ruler → ~21 cm.
• Measure coin diameter with the ruler → ~2.4 cm.
• Divide notebook length by coin diameter (21/2.4) → ~9 coins.

Linear Motion : Linear motion is defined as movement along a straight line.

• Example 1: An orange falling straight down from a tree.
• Example 2: Students performing a march-past during a parade.

Circular Motion : Circular motion occurs when an object moves along a circular path.

• Example 1: An eraser or potato tied to a thread and whirled in the air.
• Example 2: The movement of riders or horses on a merry-go-round.

Oscillatory Motion : Oscillatory motion is the to-and-fro movement of an object about a fixed position.

• Example 1: A child playing on a swing.
• Example 2: The up-and-down movement of a thin metal strip when one end is fixed to a table and the free end is pressed and released.

Rollercoaster (A → B → C → D → E → F)

She should not use stretchable rubber because it can stretch and deform during measurements which give inaccurate measurements.

Name of the Game: Length Conversion Challenge

Materials Required

• Chart paper or thick paper
• Sketch pens
• Scissors

How to Make the Cards

• Cut the paper into small cards of equal size.
• Write different lengths on some cards.
• Write their correct converted values on other cards.

Examples:

• 1 km → 1000 m
• 5 m → 500 cm
• 250 cm →5 m
• 100 cm → 1 m
• 3000 m → 3 km
• 50 mm → 5 cm

How to Play

• Shuffle all the cards and place them face down.
• Each player picks two cards.
• If the two cards form a correct conversion pair, the player keeps the pair and earns 1 point.
• If the cards do not match, place them back face down.
• Continue until all pairs are matched.

Winner :  The player with the highest number of matching pairs wins the game.

Learning Outcome :

This game helps students:

• Learn units of length.
• Practice unit conversions.
• Improve memory and observation skills.
• Have fun while learning.