I am a 66 y/o firefighter that competes in the Firefighter Combat Challenge. One of the evolutions requires the FF to use a Keiser Force Machine. This is a 160# beam on Teflon runners, 2 each 2" x 36", in a stainless still tray. Using a 9# shot hammer we have to drive the beam 5'. The problem has been having the Keisers, 1 in each lane to slide the same every time. I am looking to calculate the force necessary to drive this beam 10" with 1 hit from the shot hammer. The goal is to turn this into a computerized machine, where we can get consistency, but also take into the fact that hitting it again, before it stops moving, you can move it farther with the same amount or force. It has been 40-45 years since I had any physics, but I remember there being formulas to calculate this information. Right now I am looking to see what size the force measuring device needs to be to start. Thanks.