Speed, Distance and Time
ICSE · Class 7 · Mathematics
Summary of Speed, Distance and Time for ICSE Class 7 Mathematics. Key concepts, important points, and chapter overview.
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Overview
Speed, distance, and time are closely connected ideas used to describe motion. Speed tells how much distance is covered in a given time. Distance tells how far an object travels. Time tells how long the journey takes. These three quantities are linked by simple formulas and unit conversions, and the
Key Concepts
Speed is the distance covered by
Speed is the distance covered by a moving object in unit time. The formula is Speed = Distance / Time. In metres and seconds, speed is in m/s. In kilo
Distance is the quantity covered by
Distance is the quantity covered by a moving body. It is found by Distance = Speed × Time.
Time is the duration taken
Time is the duration taken to cover a distance. It is found by Time = Distance / Speed.
1 km/h equals 5/18 m/s
1 km/h equals 5/18 m/s, and 1 m/s equals 18/5 km/h or 3.6 km/h. To convert km/h to m/s, multiply by 5/18. To convert m/s to km/h, multiply by 18/5.
Average speed is obtained by dividing
Average speed is obtained by dividing the total distance covered by the total time taken. It is used when speed changes during a journey.
Learning Objectives
- Understand the meaning of speed, distance, and time
- Use the formulas Speed = Distance / Time, Distance = Speed × Time, and Time = Distance / Speed
- Convert speeds between km/h and m/s
- Find average speed for a journey with different parts
- Use relative speed for objects moving in the same or opposite directions
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