KS3 Science · Physics
Speed and motion
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Key words
Speed How far something travels in a certain time
Distance How far something has moved
Time How long something takes
Metres per second The unit of speed used most in science (m/s)
Kilometres per hour A unit of speed: the kilometres travelled each hour (km/h)
Miles per hour The unit of speed on road signs in the UK (mph)
Average speed Total distance divided by total time
Stopwatch An instrument that measures a time
Tape measure An instrument that measures a distance
Distance-time graph Shows how far something has travelled at each moment of a journey
Gradient How steep a line on a graph is
Steady speed A speed that stays the same
Stationary Not moving
Acceleration How quickly speed increases or decreases
Relative motion How something seems to move to an observer who is moving too
Relative speed The speed of one object measured from another object
Observer The person who watches and measures