Speed Flashcards
(13 cards)
What is the purpose of using a stop-clock or stop-watch in measuring speed?
To measure the time it takes for an object to move a measured distance
Human reaction time can introduce errors in measurements.
What is a light gate and how does it work?
A device where a light beam shines onto a light-sensitive switch that starts and stops an electronic stop-watch when broken
It provides a more accurate measurement of speed than manual timing.
How is speed calculated using light gates?
Speed is found by dividing the distance between the light gates by the time measured by the stop-watch
This method eliminates human error in timing.
What does radar stand for?
Radio detection and ranging
It is a method used to find the position and speed of objects.
Describe how a speed-trap gun measures the speed of a vehicle.
It sends a beam of radio waves to the vehicle, which reflects back to the gun, and the time difference is used to calculate speed
Radio waves have electrical and magnetic properties that transfer energy.
What technology is used to detect the position of a vehicle from space?
An electronic device called a tracker
It allows satellites to track vehicle movement and position.
What type of clock is used on satellites to measure time accurately?
An atomic clock
Atomic clocks measure time using the vibration of atoms.
True or False: Human reaction time can lead to inaccuracies when using a stop-clock.
True
This is why more accurate methods like light gates are preferred.
Fill in the blank: A speed-trap gun uses _______ to measure the speed of an approaching vehicle.
[radio waves]
Radar technology is central to this measurement.
speed =
Distance/time
time=
Distance/speed
distance=
Speed×time
Speed is a measure of the …
Distance coverd by an object in a certain amount of time
