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    mudit's Avatar
    mudit Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Dec 23, 2007, 11:24 PM
    Internal forces
    Is it true that internal forces can't move a body, if yes
    Then how a mobile switched on viberation moves when a phone comes... :eek:
    oneguyinohio's Avatar
    oneguyinohio Posts: 1,302, Reputation: 196
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    #2

    Dec 23, 2007, 11:29 PM
    If internal force is greater than external forces, movement could result... how do people move if not by internal force when muschles are used? Perhaps I don't understand the question.
    Capuchin's Avatar
    Capuchin Posts: 5,255, Reputation: 656
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    #3

    Dec 24, 2007, 07:07 AM
    I'm not sure what you mean by internal force. Surely if you look at a different reference frame, any internal force is actually an external force.
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
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    #4

    Dec 24, 2007, 05:10 PM
    I think the question is valid.

    What makes the mobile phone ring? What effects a connection with the phone?

    Electromagnetic forces switch something on in the handset.

    The same principle causes vibration of the phone.

    Again, I think the principle of internal forces not causing a body to move is not valid
    In case of chemical reactions. After all, bombs do explode because of such reactions.
    terryg752's Avatar
    terryg752 Posts: 197, Reputation: 4
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    #5

    Dec 24, 2007, 05:29 PM
    Furthermore, I believe that the principle of internal forces not causing motion is not a universal one. It is valid in case of statics/dynamics/mechanics, but may not apply in all circumstances.
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