1. The problem statement, all variables and given/known data I am trying to work out the force which a mass applies when it drops from a known height onto another object. 2. Relevant equations F=ma suvat: v^2 = u^2 + 2as F= change in momentum/time and possibly KE= 1/2mv^2 3. The attempt at a solution I don't think that F=ma applies exactly as this does not take into account where the mass is dropped from at all.. the force must be larger if the mass is travelling at a greater speed, surely?? This is the force the mass would apply if it was not moving.. I can work out the KE by finding the velocity at the moment of contact, but I don't know how to transfer this into a force. This is from a practical experiment so I don't actually have any time measurements =/ although I could estimate them by using suvat. Thanks for any help.