Class 7 Science Chapter 8: Measurement of Time and Motion | Complete NCERT Notes, Sundial Water Clock Pendulum, Speed Uniform Motion
Complete Chapter 8 Guide: Ancient Timekeeping (Sundial, Water Clock, Hourglass, Candle Clock), Activity 8.1 Water Clock Construction, Simple Pendulum Time Period, Speed = Distance/Time, Uniform vs Non-uniform Motion, SI Unit Second (s), Train Speed Calculations, Average Speed Examples Solved, Olympic Sprint Analysis, CBSE Exam Questions with Solutions
Updated: 6 months ago
Measurement of Time and Motion
Class 7 Science Chapter 8 | Complete NCERT Guide | Ancient Clocks, Pendulum, Time Period, Motion Types, Speed
Full Chapter Summary & Detailed Notes - Measurement of Time and Motion
Introduction to Time Measurement
Humans have tracked time using natural cycles like day-night, moon phases, seasons. Ancient devices include sundials, water clocks, hourglasses, candle clocks.
- Sundial: Uses Sun's shadow to tell time.
- Water Clock: Measures time by water flow or sinking bowl.
- Hourglass: Sand flow from one bulb to another.
- Candle Clock: Markings on candle for time as it burns.
Pendulum and Modern Timekeeping
Pendulum clocks marked a breakthrough. Invented by Huygens, inspired by Galileo who noted constant time for pendulum swings of fixed length.
- Simple Pendulum: Bob suspended by thread; oscillates periodically.
- Time Period: Time for one complete oscillation.
Motion and Its Types
- Rectilinear Motion: Straight line, e.g., car on road.
- Curvilinear Motion: Curved path, e.g., thrown ball.
- Periodic Motion: Repeats at intervals, e.g., pendulum.
Speed and Uniform Motion
- Speed: Distance per unit time; uniform if constant.
- Distance-Time Graph: Straight line for uniform motion.
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