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Measurement of Time and Motion

CBSE · Class 7 · Science

Quick revision notes for Measurement of Time and Motion — CBSE Class 7 Science. Key concepts, formulas, and definitions for last-minute revision.

102 questions74 flashcards5 concepts

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Key Topics to Revise

1

1. Measurement of Time

  • A day was defined by the cycle of rising and setting of the Sun.
  • People first used repeated natural events such as the phases of the Moon and changing seasons to keep track of time.
  • Ancient time-measuring devices included sundials, water clocks, hourglasses, and candle clocks.
2

2. Simple Pendulum and Time Period

  • A pendulum at rest is in its mean position.
  • When the bob is moved slightly and released, the pendulum starts oscillating.
  • Pendulum motion is periodic because it repeats its path after a fixed interval of time.
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3. Units of Time and Accuracy

  • The SI unit of time is the second and its symbol is s.
  • The larger units of time are minute (min) and hour (h).
  • The symbols s, min, and h are written in lowercase and without a full stop unless they end a sentence.
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4. Speed and Related Formulae

  • Speed means the distance covered by an object in a unit time.
  • The speed of an object is the total distance covered divided by the total time taken to cover it.
  • Since speed = distance/time, the SI unit of speed is metre/second and is written as m/s.

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Full Notes

Key Concepts

Time was first tracked by naturalA sundial determines time fromWater clocks measured time byAn hourglass measured time byA pendulum is periodic because it

Frequently Asked Questions

What are the important topics in Measurement of Time and Motion for CBSE Class 7 Science?
Measurement of Time and Motion covers several key topics that are frequently asked in CBSE Class 7 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Measurement of Time and Motion — CBSE Class 7 Science?
Understand the core concepts first, then work through the 102 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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