Science Class 7
Measurement of Time and Motion
Tell if a repeat keeps time, time a pendulum, and work out speed.
16 lessons · ~82 min total
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Lessons in this topic
- 0 Start here A clock counts a repeat. A pendulum keeps time. Speed is distance ÷ time. · 3 min You are here
- 1 Something that repeats A clock counts a repeat that has equal gaps. · 5 min
- 2 Units of time The second is the SI unit of time. 60 s = 1 min. 60 min = 1 h. · 5 min
- 3 A swing that keeps time The time period of a pendulum depends on its thread length, not on its bob. · 6 min
- 4 How fast Speed is the distance covered divided by the time taken. · 5 min
- 5 Units of speed 1 m/s = 3.6 km/h. Multiply to get km/h. Divide to get m/s. · 5 min
- 6 Steady or not Uniform motion covers equal distances in equal times. · 5 min
- 7 Average speed of a journey Average speed is the total distance divided by the total time. · 6 min
- 8 Checkpoint: time, pendulums and speed A quick check on pendulums, speed and uniform motion. · 4 min
- 9 Clocks before electricity Four old clocks count time in four ways. · 5 min
- 10 Marks on a water clock A draining straight jar loses water fast at first, then slowly. · 6 min
- 11 How exact is a clock? Better clocks gain or lose less time. · 6 min
- 12 The smallest tick A clock cannot show a gap smaller than its smallest tick. · 5 min
- 13 Speed from a timetable Time taken is arrival minus leaving. Then divide the distance by it. · 6 min
- 14 The big picture Twelve ideas about clocks, pendulums, speed and motion. · 4 min
- 15 Track quiz Thirteen quick questions on time, clocks and speed. · 6 min
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