Automated measurement of speed
Lesson 41 / 45
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Lesson outcome
I can outline how radar guns in speed cameras are used to measure speed and use light gates to measure the speed of a moving object.
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A light gate measures the time for a card of a fixed length to pass through it.
A radar gun measures changes in the frequency of reflected waves to measure speed.
A motion sensor can use reflected ultrasonic wave timings to measure changes in distance to determine speed.
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