Copernicus
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WHAT IS THE PROJECT g?
Project g is an attempt of
international collaboration through Internet, to carry out a scientific
experience in the entire world. We seek all those who want it to carry out this simple
experience
and, in this page, we will pick up the results.
WHAT
IS IT NEEDED TO PARTICIPATE?
The experience to carry out is the
measurement of g (value of the gravity) in the place where the
participant is. To measure the value of g we use the simple pendulum. Calculating
experimentally
their period, we will be able to obtain the value of the gravity easily.
HOW
IS THE EXPERIENCE CARRIED OUT?
In order to unify the
experience, we propose to follow these directions:
1º. - You need a pendulum with a thin thread not elastic (not nylon) or other light
weight thread. At
one end, place a ball of any material and a diameter of about 1 cm. Hang the other end of
a
support, so that the pendulum hangs freely.
2º. - Measure the period, that is, the necessary time for a complete oscillation (going
and return). in order to reduce errors, measure the time used by the pendulum in 10
oscillations and divide by 10. To measure the time use any type of chronometer ( the most
accurate you can).
3º. - Once you know the period, calculate the gravity. To do it, use the equation of the
period of the pendulum:
where T is the
calculated period expressed in seconds , "l " it is the longitude in meters and
"g" it is the value of the gravity that will be obtained in m/s2. Use 3.14 for
the "pi" value. To measure the longitude of the pendulum, l measure the
longitude of the thread and add the radius of the ball, because it is supposed that "
l " is equal to the length of the thread from center of oscillation to the geometric
center of the ball.
To calculate g starting from the previous equation, use:
Express "g"
with 3 decimals (ej: 9,796). You can repeat the experience as many times as you want,
but send only a result , anyone of them, or better, the average of all those that you
obtained..
To send results
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