Class 7 Science Chapter 8 PDF: Measurement of Time and Motion (Curiosity)

Class 7 Science Chapter 8, Measurement of Time and Motion, follows 100-metre sprinter Prerna as she wonders how races are timed to fractions of a second. It covers ancient timekeeping devices, simple pendulums, SI units, speed calculations, and uniform vs non-uniform linear motion.

What Class 7 Science Chapter 8 Covers

8.1 Measurement of Time traces sundials, water clocks (ghati-yantra), hourglasses and quartz/atomic clocks, then experiments with a simple pendulum (oscillation and time period, 8.1.1) and defines the SI unit of time—the second (8.1.2).

8.2–8.3 Slow or Fast & Speed defines speed as distance covered per unit time (Speed = Distance / Time), compares m/s and km/h, and shows how speedometers and odometers work (8.3.1).

8.4 Uniform and Non-uniform Linear Motion distinguishes objects moving along a straight line at constant speed (uniform linear motion) from objects whose speed keeps changing (non-uniform linear motion).

Exercises in Chapter 8

• In a Nutshell key points summary and Let Us Enhance Our Learning chapter exercises.
• Exploratory Projects and Dive Deeper hands-on science activities.

Read Class 7 Science Chapter 8 Online

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FAQ

What is the time period of a simple pendulum?
The time period is the time taken by the pendulum bob to complete one full oscillation; for a given length, it remains constant regardless of small changes in bob mass or release angle.

What is the formula for speed and its SI unit?
Speed = Total Distance Covered / Total Time Taken. Its SI unit is metre per second (m/s), while kilometre per hour (km/h) is used for larger distances.

Updated 2026–27 NCERT Class 7 Books & Chapter-Wise PDFs

Looking for all chapters and the latest 2026–27 NCF NCERT textbooks for Class 7? Open any chapter below to download its official PDF or read our Read Online & Notes study guide, or visit the complete NCERT Class 7 Books PDF (2026–27 Main Page) for all subjects or All NCERT Books PDF (Class 1 to 12).