Hello everyone, I do not need homework-guidance, but having read the COC, I decided this was the best suited place for my question. It's a conceptual-understanding type of question. I am trying to fully understand some new physics concept, namely momentum and impulse. ƩF = dmv/dt I = mv2 - mv1 Now, I read about a woodpecker banging its head against a tree about 20 times a second and about 12000 times a day with an average force of 1200 times the weight of its head. The reason that the woodpecker is capable of doing this, is because the impulse i.e. F*Δt = p2 - p1 is very small when it strikes its beak. My question: Can Impulse also explain why it never really hurts when you peel off a sticking plaster very quickly, opposite to when you are slowly peeling it off, i.e. is F*Δt = p2 - p1 < epsilon? Hope this wasn't too irrelevant and any answer is appreciated. Thank you.