Last Updated Sep 26, 2025

Measuring Speed Simplified Revision Notes for GCSE AQA Physics Combined Science

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5.6.3 Measuring Speed

Speed Variability

infoNote

The speed of a moving object is rarely constant. When people walk, run, or travel in a car, their speed is constantly changing.

Typical Speeds

• Wind: 5 – 7 $m/s^{-1}$
• Sound: 330 $m/s^{-1}$
• Walking: ~ 1.5 $m/s^{-1}$
• Running: ~ 3 $m/s^{-1}$
• Cycling: ~ 6 $m/s^{-1}$
• Bus: 14 km/h
• Train: 125 miles/h
• Plane: 900 km/h

Distance and Time Measurement

• Distance: measured in mm, cm, m, km.
• Time: measured in ms, s, mins, hours.
• Use appropriate units depending on the lengths involved.

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