When we jump on a concrete surface ,the feet are more seriously hurt than while jumping on sand because if we fall on concrete surface there will very less time to make momentum zero , force will hit with greater intensity and if we fall on any soft surface ,enough time will be their to make momentum zero and force will decrease
It states that the time rate of change of momentum of a body is equal to force imposed on it The body whose mass is constant , newton's 2nd law of motion can be written as F = ma
When we jump on a concrete ,the feet are more seriously hurt than while jumping on sand because if we fall on concrete there will very less time to make momentum zero , due to which force doesn't decrease and hit with greater intensity
but if we fall on any soft surface then it will take long time for us to stop and enough time will be their to make momentum zero , in that time span the intensity of force will decrease as rate ( by newtons 2nd law) has increased and feet won't hurt that much
learn more about Newton's 2nd law of motion
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