Ch 10 covers measurement of distances using standard units and different types of motion. Students learn about the SI system, use of measuring instruments, and classify motion as rectilinear, circular, rotational, or periodic.
Standard units ensure uniform measurement worldwide. SI unit of length is metre (m). Other units: kilometre (km), centimetre (cm), millimetre (mm). Measuring tools: ruler, measuring tape, metre stick.
Rectilinear motion: in a straight line (car on a straight road). Circular motion: along a circle (hands of clock, earth around sun). Rotational: spinning around an axis (top, earth on its axis). Periodic motion: repeats at regular intervals (pendulum, heartbeat).
Download: https://ncert.nic.in/textbook/pdf/fesc110.pdf | Complete book: https://ncert.nic.in/textbook/pdf/fesc1ps.zip
Yes. For example, a ball rolling on the ground has both rectilinear (moves forward) and rotational (spins around its axis) motion. The earth has rotational motion (on its axis) and circular motion (around the sun).
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