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Chapter Analysis
Beginner22 pages • EnglishQuick Summary
The chapter 'Measurement of Length and Motion' introduces students to the concept of measuring lengths using both non-standard and standard units. It explains the International System of Units (SI), highlighting units such as metre, centimetre, and kilometre. The chapter further explores various types of motion, including linear, circular, and oscillatory, providing practical examples and activities to understand these concepts better.
Key Topics
- •SI units of length
- •Types of motion (linear, circular, oscillatory)
- •Measuring techniques for curved lines
- •Comparison of non-standard and standard units
- •Importance of reference points in measurements
Learning Objectives
- ✓Understand the concept and application of SI units for measuring length
- ✓Identify different types of motion and provide examples
- ✓Learn techniques for measuring lengths accurately
- ✓Distinguish between motion and rest in various contexts
- ✓Apply knowledge of measurement in practical situations
Questions in Chapter
Some lengths are given in Column I of Table 5.5. Some units are given in Column II. Match the lengths with the units suitable for measuring those lengths.
Answer: Distance between Delhi and Lucknow - kilometre; Thickness of a coin - millimetre; Length of an eraser - centimetre; Length of school ground - metre.
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Read the following statements and mark True (T) or False (F) against each.
Answer: (i) The motion of a car moving on a straight road is an example of linear motion. (True/False). (ii) Any object which is changing its position with respect to a reference point with time is said to be in motion. (True/False). (iii) 1 km = 100 cm (True/False).
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Which of the following is not a standard unit of measuring length?
Answer: (i) millimetre (ii) centimetre (iii) kilometre (iv) handspan
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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.
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Suppose the distance between your school and home is 1.5 km. Express it in metres.
Answer: 1500 metres
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Additional Practice Questions
Explain what is meant by 'SI units' and why they are important.
mediumAnswer: SI units, or the International System of Units, are a standardized set of base units used worldwide for scientific, technical, and everyday measurements. They are important because they provide consistency and clarity, allowing for accurate communication and comparison of measurements globally. The SI unit of length is the metre.
Describe how you would measure the length of a curved line.
mediumAnswer: To measure the length of a curved line, use a flexible measuring tape or a piece of string. First, carefully place the string along the curve, ensuring it follows the line exactly. Then, mark the string at the start and end of the curve. Straighten the string and measure its length using a standard ruler or measuring tape. The measured length is the length of the curved line.
List and describe the differences between linear, circular, and oscillatory motion.
mediumAnswer: Linear motion occurs when an object moves in a straight line. Circular motion occurs when an object follows a circular path, such as a planet orbiting a star. Oscillatory motion occurs when an object moves back and forth about a fixed point or position, like a pendulum. Each type of motion is characterized by distinct path and periodicity features.
What is the smallest unit of length, and how is it related to other units?
easyAnswer: The smallest unit of length in the SI system is the millimetre (mm). It is related to other units as follows: 1 centimetre (cm) equals 10 millimetres, and 1 metre (m) equals 100 centimetres or 1000 millimetres. Understanding these relationships is essential for converting measurements between different units.
Create a scenario where choosing the correct unit of measurement is crucial for accuracy.
hardAnswer: Imagine you are a civil engineer tasked with designing a bridge. Choosing the correct unit of measurement, such as metres or kilometres for distances and centimetres or millimetres for more precise sections, is crucial to ensure the structural integrity and safety of the bridge. Incorrect units could lead to serious miscalculations, resulting in a faulty design.