Grade VI worksheet on motion and measurement of distances with fill-in-the-blank, identification, and short-answer questions.

Problem Analysis:

The image contains a worksheet on "Motion and Measurement of Distances" for Grade VI. Let's solve each part step by step.

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1. Fill in the blanks

#### a. The SI unit of mass is ______.
- Solution: The SI unit of mass is the kilogram (kg).
- Answer: kilogram

#### b. The SI units are based on ______ system of units.
- Solution: The SI units are based on the metric system.
- Answer: metric

#### c. ______ is the length between the tips of thumb and the little finger of our stretched palm.
- Solution: This length is known as the span.
- Answer: span

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2. Identify the types of motion

#### a. Motion of plucked string of a guitar
- Solution: When a guitar string is plucked, it vibrates back and forth about its equilibrium position. This type of motion is called vibratory motion or oscillatory motion.
- Answer: Vibratory motion

#### b. Motion of a butterfly
- Solution: A butterfly moves in an irregular, non-linear path as it flutters its wings. This type of motion is called random motion.
- Answer: Random motion

#### c. Motion of the pendulum of a clock
- Solution: The pendulum of a clock swings back and forth in a regular, periodic manner. This type of motion is also vibratory motion or oscillatory motion.
- Answer: Vibratory motion

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3. Give answer in one word

#### a. Body moves along a curved path
- Solution: When a body moves along a curved path, it is said to be in curvilinear motion.
- Answer: Curvilinear

#### b. Gives an approximate value of quantity
- Solution: An approximate value of a quantity is often referred to as an estimate.
- Answer: Estimate

#### c. It is the mode of transportation which was invented by Wright Brothers
- Solution: The Wright Brothers are famous for inventing the airplane.
- Answer: Airplane

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4. If a train travels in a straight line from city A to B, it covers 1040 km. If an aeroplane flies in a curved path between the same two cities, how much distance will it cover? Why?

#### Solution:
- Straight-line distance (train): The train travels in a straight line from city A to city B, covering a distance of 1040 km. This is the shortest possible distance between the two points, known as the straight-line distance or displacement.
- Curved path (aeroplane): The airplane flies in a curved path due to factors such as air currents, flight routes, and the Earth's curvature. Since the path is not straight, the distance covered by the airplane will be greater than the straight-line distance.
- Reason: The shortest distance between two points is a straight line. Any deviation from this straight line (such as a curved path) increases the total distance traveled.

#### Answer:
The airplane will cover a distance greater than 1040 km because it follows a curved path.

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Final Answers

1. a. kilogram
b. metric
c. span

2. a. Vibratory motion
b. Random motion
c. Vibratory motion

3. a. Curvilinear
b. Estimate
c. Airplane

4. The airplane will cover a distance greater than 1040 km because it follows a curved path.

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Boxed Final Answer

\[
\boxed{
\text{1. a. kilogram, b. metric, c. span} \\
\text{2. a. Vibratory motion, b. Random motion, c. Vibratory motion} \\
\text{3. a. Curvilinear, b. Estimate, c. Airplane} \\
\text{4. Greater than 1040 km}
}
\]