I have a problem that I'm having trouble cracking and was wondering if anybody has any ideas on it. An impact test that we have to do involves swinging a pendulum of weight 50lbs into a rolling easel (for writing on, approximately 6ft high, with casters). The wheels are blocked so the easel can tip over if it is not stable enough. I want to be able to apply physics to this to be able to optimize the easel design without having to iterate prototypes more than 1x or 2x. A simple force/moment calculation would be great to apply to this situation, but this is an impact problem so that won't work. Also, I tried conservation of PE, but that doesn't take into account that the higher you impact the easel, the easier it is to tip it over. I'm thinking a conservation of momentum application? *It is also unrealistic to know how long the impact occurs for, given the lack of high speed cameras etc., so an F=ma calculation isn't going to be possible. I'm a bit stuck here... I feel like the answer is on the tip of my tongue but I can't get to it... does anybody have any ideas?