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November 4th, 2014, 05:44 AM   #11
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Yes. You would have to write a computer program that calculates the various things based on a set number of initial parameters. Do you know programming?
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November 4th, 2014, 01:53 PM   #12
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Originally Posted by Benit13 View Post
Yes. You would have to write a computer program that calculates the various things based on a set number of initial parameters. Do you know programming?

No, I'm pretty useless with computers. Thanks for all the work!
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November 5th, 2014, 02:17 AM   #13
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I think I made a mistake somewhere (didn't take into account g in the weight?) because a colleague of mine found a much easier way of calculating this sort of problem.

If you think of the problem in terms of changes in energy instead of a dynamics problem, you are effectively changing kinetic energy into gravitational potential energy. Consequently

$\displaystyle mg\Delta h = \frac{1}{2}I\omega_i^2$

Solving for $\displaystyle \omega_i$ using the parameters determined earlier yields [MATH]\omega_i = 1.06/MATH] radians per second, which in turn yields a force of 12,800N needed to knock the punch bag over. I think this is a much more realistic number.

I must admit, I facepalmed when he suggested it, because it's such an obvious method which is ideal for solving problems like this. You won't need a computer program for simple physics like this because it can just be done on paper

Last edited by Benit13; November 5th, 2014 at 02:20 AM.
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