Measurement of Time and Motion
Trains run to timetables and athletes chase seconds, so measuring time and speed fairly matters, as this chapter of the NCERT Curiosity textbook for Class 7 shows. It introduces clocks from simple pendulums to modern instruments, units from seconds to hours, and the idea of speed as distance divided by time. Activities time pulses and walks, plot simple distance-time readings, and distinguish uniform motion from non-uniform motion, ending with why accurate measurement keeps travel, sport, and science honest.
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