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    Evil dead's Avatar
    Evil dead Posts: 116, Reputation: -5
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    #1

    Mar 19, 2007, 10:53 AM
    Pairs of forces
    I do not understand this. Newtons 3rd Law claims every force is met with another opposite and equal force.

    Why then when I punched a spackle wall it breaks?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #2

    Mar 19, 2007, 11:27 AM
    I don't understand how you're using newton's third law to argue that it shouldn't.
    Evil dead's Avatar
    Evil dead Posts: 116, Reputation: -5
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    #3

    Mar 19, 2007, 11:51 AM
    Wait am I mixed up?

    It says that every force has an opposite that is the same size and magnitude. How would you prove this?
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #4

    Mar 19, 2007, 12:19 PM
    Yes... but that has nothing to do with the wall breaking. You hit the board with a force greater than the materials strength. Thus it breaks.

    The material exerts the same but opposite force on your hand, but your hand doesn't break because it's stronger..

    I don't understand what you're confused about :)
    Evil dead's Avatar
    Evil dead Posts: 116, Reputation: -5
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    #5

    Mar 19, 2007, 01:02 PM
    Thank you very much. That was such a simple explanation, when my teacher talked about it I was baffled.
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