Hello people In this thread I am interested in how to calculate Newtons or force from a falling object being stopped by someone or something such as a machine. In my example below is a scenario- A 6000 ton ball of iron moves from directly above this person who is roughply 2 meters tall and quite broad. Its moving at 11 meters/second and travels this 11 meters before hitting this person, who decelerates it to barely moving, its on their back and balanced with them straining, sweat running down their face etc. What is the calculation to find out how much force in newtons was required to stop the ball moving? I assume its similiar to Force=massxacceleration? but instead of accleration is it deceleration? Is it more complicated that this? For example, does the mans own mass, weight etc play a role in absorbing some of the iron balls own force, therefore reducing the force he requires to stop it with his own strength? I am curious on how to calculate this, please help. Thank you.