
Take
one of the pieces of composition paper, while holding it with the margin
at the bottom; fold it in half lengthwise so it is 11 inches long and 4.25 inches wide.

Keep
the margin at the bottom of the paper and begin numbering on the bottom
line with the number 0 until you have placed a number on each line.

Staple
the two sides together.

Place
a paper clip at the bottom of the paper (or tape a penny to it)).
You have made your reaction time tester.

Get
a partner, one of you will drop the other will be tested for your reaction
time.

The
person being tested will have their thumb and forefinger 1 inch apart.

The
dropper will ask the tester, Are you ready?

The
tester will respond by saying, OK.

The
dropper will then drop the paper straight down.

The tester will close their fingers as quickly as possible and hold
the paper.

The dropper will record the number of the line that the testers fingers
are on.

Repeat this until 10 trials have been recorded for each person.

Find the mean (average) reaction time for each person.
(If you do not remember how to figure out the average, ask another
group.)

To
figure your reaction time in seconds use the following formula:
Seconds = sqrt (avg.
lines / 980).
In words this would be "your reaction time in seconds = the square
root of your average number of lines divided by 980. Click here
if you want to know the rationale for the formula and learn about velocity
and and acceleration of gravity.