I was wondering something, I dropped a box onto my glass desk but it didn't bounce back, I also hit a hammer against a rigid wall, the matter smacked into the wall, it has KE. It never bounced back, I didn't see any deformation or rebound in either situation, I wasn't hitting too hard nor dropped the box to hard. However, the KE of the hammer will be turned into force, now the wall didn't move nor did the hammer cause deformation nor penetration, it didn't rebound so how do I calculate the impact force? KE is converted to force but no displacement ore rebound, it must exert a force but how do I calculate it? If I fire a bullet at tank armor, it absorbs the impact, you wont feel it on the other side(the impact force)...right? How would I calculate impact force on non-penetrating projectiles? the wall must have absorbed all the force and the hammer didn't rebound...but how can we calculate the force?