Lesson 0 of 16
Start here
Show on a big screenA race ends in a photo finish. The runners finish almost together. What tells the winner?
Read Chapter 8, Measurement of Time and Motion, in your NCERT book.
What you will do
- Tell which repeats can keep time.
- Change time between hours, minutes and seconds.
- Time a pendulum.
- Calculate speed, and compare two speeds.
- Tell uniform motion from non-uniform motion.
- Find the average speed of a trip.
- Name the old clocks and what each counts. Read the time from a sundial.
- Mark a water clock, and see why the marks come close together.
- Compare how exact clocks are.
- See what the smallest tick of a clock decides.
- Find speed from a railway timetable.
Each lesson starts with a small lab. Read the words after it.
Need a quick recap?
- Standard units (Class 6) — a metre means the same length everywhere.
- Motion along a straight line (Class 6) — called linear motion.