Measurement of Time and Motion
CBSE · Class 7 · Science
Summary of Measurement of Time and Motion for CBSE Class 7 Science. Key concepts, important points, and chapter overview.
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Overview
Time is measured by regularly repeating events and by devices that repeat a steady process. A day is based on the rising and setting of the Sun. Early timekeeping used sundials, water clocks, hourglasses, and candle clocks. Later, pendulum clocks, quartz clocks, and atomic clocks gave greater accura
Key Concepts
Time was first tracked by natural
Time was first tracked by natural cycles such as the rising and setting of the Sun. Devices like sundials, water clocks, hourglasses, and candle clock
A sundial determines time from
A sundial determines time from the changing position of the shadow of an object cast by sunlight. It measures local or solar time, so a correction is
Water clocks measured time by
Water clocks measured time by the flow of water in or out of a vessel. The sinking bowl type, called Ghatika-yantra, used a bowl that filled and sank
An hourglass measured time by
An hourglass measured time by the flow of sand from one bulb to another. Candle clocks had markings that showed the passage of time as the candle burn
A pendulum is periodic because it
A pendulum is periodic because it repeats its motion after a fixed interval of time. One complete oscillation is a full to-and-fro motion. The time ta
Learning Objectives
- Understand how time was measured before modern clocks and watches
- Identify different ancient and modern time-measuring devices
- Explain the idea of time period using a simple pendulum
- Use the SI unit of time and correct symbols for time units
- Calculate speed using distance and time
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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