1- Measuring Speed Flashcards
1
Q
what does the police use to measure the speed of cars?
A
radar guns and speed cameras
2
Q
what is the method for timing races TODAY?
A
today, the starting signal comes from a speaker behind the athlete. a clock is started electronically at the same time as the signal sounds. when the athletes cross the finish line, a camera linked to the clock registers the times.
3
Q
what was the method for timing 50 years ago?
A
a gun was shot into the air, and when the athletes saw the smoke, they ran and the stopwatch was started after the bang.
4
Q
why is electronical timing better than using a stopwatch?
A
- hand timing can be influenced by external factors such as not seeing the puff of smoke or slow reflexes
- electronic timing is much more accurate
