Using the multiquote feature.
Me too :rolleyes:
Originally Posted by ThePerfectHacker
Originally Posted by CaptainBlack
such as friction on the string?
2. Damping other than air resistence that you don't know the nature of.
3. Its a low speed device for long pendulums where air resistance will be
small, short pendulums can be higher speed, but will leave you with timing problems.
and so on.
If only I knew how :o but the problem is that the main thing I have to do is find the "coefficient of drag" (so that I can compare my equation to the established equation) which is almost always determined experimentally.
Build a mathematical model (or models) of the system with free
parameters representing the unknowns. Use model to predict the
result of experiments, vary the parameters until model and
Don't worry about being able to "solve" the model all that is necessary
is that you can simulate the behaviour of the experiment to obtain the
results that you could have measured of off the experiment itself.
I was planning to film it and have a timer in the picture, which seems to be a little easier.
Video it using a digital camera of some sort, extract the frames onto
your computer and take the measurements off of the frames, using the
frame count as a timer.
You will need to calibrate the frame rate rather than rely on its nominal
value. Do this by filming a digital clock with a second hand and say counting
the number of frames for it to sweep through 60 seconds.
I'm using everyones input to decide which one I should do. As a year long science fair project, the teacher thinks that that experiment is too easy and will make it hard to get a good grade. And the problem with the trebuchet is that I will need a reasonable sized one and my adviser at the school science seminar thinks it might not get approved by the science fair people, whoever they are :(.
I would still go for filming a dropped projectile myself.