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    Shurooq's Avatar
    Shurooq Posts: 2, Reputation: 1
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    #1

    Feb 22, 2010, 12:22 PM
    Driving a nail into a wood placed on your head doesn't hurt, why?
    When you drive a small nail into a piece of wood placed on top of a pile of books on your head. Why doesn't this hurt?

    Is there any relationship between the question and Newton’s first law of motion?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Feb 22, 2010, 03:37 PM

    Who says it doesn't hurt? Sounds like a fun experiment to try - but you go first!
    Shurooq's Avatar
    Shurooq Posts: 2, Reputation: 1
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    #3

    Feb 23, 2010, 12:08 AM

    My physics book said it doesn't hurt!

    But I don't trust my book, so you will go first =P
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #4

    Feb 23, 2010, 09:01 AM

    In my opinion, I think that the books act as cushion... If the paper used are thick and easy to squish.
    MiRe7's Avatar
    MiRe7 Posts: 1, Reputation: 1
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    #5

    Sep 16, 2010, 09:49 AM
    There is a relationship and I'm sorry I didn't read your question before... It doesn't seem like you've gotten much help. But it's called inertia. Since the hammer is only acting on the nail, driving into the wood it doesn't hurt because the force isn't acting on your head.
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