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Message: [QUOTE="RM_guy, post: 1424963, member: 20652"] I haven’t taken physics for over 30 years but I still apply it almost every day. I just have to refresh my memory from time to time. The velocity of the mass that impacts the wall will develop a G force that you multiply by the weight to get the actual force that the wall will see. You can then use that value to calculate the stresses. If you are at the limit without any velocity then it won’t be strong enough with any speed. Calculating the kinetic energy is just part of it. Here a web site that explains it pretty well. [url]http://www.ehow.com/how_7617983_calculate-force-impact.html[/url] [/QUOTE]