Question

Your empty hand is not hurt when it bangs lightly against a wall. Why does your hand hurt when it bangs against the wall while carrying a heavy load? Which of Newton's laws is most applicable?​

Answer 1

It does not hurt when an empty hangs lightly against a wall because the wall applies an
equal and opposite reaction force on you. In this case, Newton's third law is applicable.
Our hand hurts, when we are carrying a heavy load. This is because; the downward force acts or
our hand. This downward force depends on the weight of load. In this case, Newton's second law
is applicable.
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