Why do you get a more accurate measurement of the time that it takes a ball to fall using timing gates rather than a stopwatch?
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If I wanted to measure the acceleration of a falling object using light gates, how many would I need to use? Because I can't see how you would calculate it using two light gates...from my understanding (which may be completely wrong), the first light gate would start timing when the object breaks the light beam and when the second light beam is broken, you would get the time taken for the object to fall through the distance between the two light gates. But the object would have an initial speed 'u' when it breaks the first light beam so how can you calculate acceleration using only one time?
s = ut + 0.5at^2 ...and you don't have both 'u' or 'a' so how do you calculate 'a'?
Answer:
Accurate measurement of the time depends upon one factor that is the reaction time.
As according to the given example the ball is going to fall if we fall the ball and measure the time by using the stopwatch.
The data recorded from stopwatch gives the information that there is delay in the time that is denoted by the reaction time.
The reaction time can become accurate using the timing gates.
In timing gates, the ball is going to fall, it will be going to pass through the light beam.
When it first break from the top the time is noted and when it reaches down then the beam will break and gives the time in three significant digits.
That is how timing gates are helpful in giving accurate measurements.
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