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November 4th, 2014, 04:44 AM  #11 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,156 Thanks: 731 Math Focus: Physics, mathematical modelling, numerical and computational solutions 
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?

November 4th, 2014, 12:53 PM  #12 
Member Joined: Jul 2014 From: Seattle Posts: 96 Thanks: 2  
November 5th, 2014, 01:17 AM  #13 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,156 Thanks: 731 Math Focus: Physics, mathematical modelling, numerical and computational solutions 
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 01:20 AM. 

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