Q1
Speed is calculated as:
ADistance ÷ Time
BTime ÷ Distance
CDistance × Time
DDistance + Time
CBSEClass 7 (CBSE)ScienceCh 8 · Topic 2
Measuring Motion - Speed
Learning to calculate the speed of a moving object.
Core concept
Average speed considers the total distance divided by total time for an entire journey, even if the actual speed varied along the way — for example, a car may speed up and slow down in traffic, but its average speed for a 100 km trip taking 2 hours is 50 km/h. Speedometers in vehicles show instantaneous speed at any given moment, which can differ from the average speed of the whole trip. Speed and distance calculations are used daily in transportation, sports, and even weather forecasting (wind speed).
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• Speed is calculated as: Speed = Distance ÷ Time.
• Common speed units: km/h and m/s.
• Average speed = total distance ÷ total time for the whole journey.
• A speedometer shows instantaneous speed, which can differ from average speed.