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    Mechanics 1

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    The Banker
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    Mechanics 1

    Post by The Banker on Thu Oct 21, 2010 5:24 am

    so just when i thought i got rid of Physics.. it pops up again in one of my maths modules -___-

    anywayz.. i need help with this Q about some next particle on an inclined plane...
    the Q goes like this...

    A box of mass 2Kg is pushed up a ROUGH (so friction is involved) plane by a horizontal force of magnitude 25N. The plane is inclined to the horizontal at an angle of 10 degrees. Given that the coefficient of friction ("mu") between the box and the plane is 0.3, find the acceleration of the box.

    the answer is supposed to be 7.1 m/s^2 (2s.f) BUT like HOW??!!!!

    the guy in the book drew out the question like this

    thanks!
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    Doc
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    Re: Mechanics 1

    Post by Doc on Thu Oct 21, 2010 11:58 am

    try gsin-ukgcos = acceleration

    g = gravity (9.8m/s^2)

    uk = coefficient of friction
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    The Banker
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    Re: Mechanics 1

    Post by The Banker on Thu Oct 21, 2010 3:36 pm

    it ain't givin me da right answer man slanty
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    Re: Mechanics 1

    Post by Doc on Thu Oct 21, 2010 4:53 pm

    sorry man i dunno ... im just a dumb noob lol ...

    but it def involves trig ... too bad i never pay attention in physics lol

    yeah so you know F = ma is involved too ... i feel stupid Very Happy
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    Ahmed
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    Re: Mechanics 1

    Post by Ahmed on Thu Oct 21, 2010 6:37 pm

    That's easy Marwa...but to be honest I sort of forgot this and my head hurts from economics. Good Luck

    But remember for slide use sin and for the other one use cos.


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    Re: Mechanics 1

    Post by The Banker on Thu Oct 21, 2010 7:41 pm

    @ Sayf:: and so u should... ur properly confusin me with ur random equations Hilarious

    @ ahmed:: -___- easy??!
    tell me how its done when ur feelin betta
    please Sad
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    Re: Mechanics 1

    Post by Ahmed on Thu Oct 21, 2010 7:49 pm

    Im sorry, but I emptied my mind after I finished last year.

    Ill ask Lev if he remembers.


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    Re: Mechanics 1

    Post by The Banker on Fri Oct 22, 2010 6:33 pm

    kay, thanx

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