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7 Apr 2010 20:15:38 IST
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U even said friction cannot do possitive work any where few posts ago..
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IIT |
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7 Apr 2010 20:18:37 IST
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Buddy, friend, human, pal, amigo, LOOK at this post and the last one too. I have quoted one exception where friction DOES positive work, and that too is dependant on the frame of reference. And one more thing. If you can take my word for it, please do so, if you can't its just as well for me. I'm done explaining.
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Autobots, Recon. |
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7 Apr 2010 20:24:06 IST
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" friction can't do positive work, because: (1) In the case of kinetic friction: Kinetic friction always oppose motion so W = F*d*cos(x>90 degrees) = - F*d (2) In the case of static friction: Their is no displacement and therefore no work is done. Note: Friction can aid motion, as is the case when you are driving. " | |
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 » ÆoniuM XEonAX «><> |
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7 Apr 2010 20:26:36 IST
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Theres even a block on block example dude where friction does possitive work. I sort of lost my notes or else I could draw it for u. BUT U DID SAY FRICTION CAN NEVER DO POSITIVE WORK.
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IIT |
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7 Apr 2010 20:30:43 IST
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@El cangri de tontos: Look, I'm sorry but I can't help you any further, I tried, you don't need me. Hell you don't even need this forum. What you really need is for a physics teacher to sit down with you and help you with your doubts. I'm sorry once again. Maybe this guy can help you. @ÆσηιυΜ χєσηαχ: Best of Luck.
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Autobots, Recon. |
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7 Apr 2010 21:29:09 IST
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| Optimus Prime | | @ÆσηιυΜ χєσηαχ: Best of Luck. | | thanks Optimus Prime
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» ÆoniuM XEonAX «><> |
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7 Apr 2010 21:33:22 IST
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Hey dont act smart .. u said friction cant do possitive work and then u changed ur view.
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IIT |
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7 Apr 2010 21:37:02 IST
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@ÆσηιυΜ χєσηαχ Imagine a small block resting on top of a larger block. If the bottom block accelerates it will drag the top block with it. Since the force of friction on the small block and it's displacement are in the same direction, the "work" is positive.
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IIT |
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7 Apr 2010 21:41:18 IST
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@El cangri de tontos: I'm not acting smart, it comes naturally. And you are taking the force from frame of reference of the block, and displacement from the ground frame in your example. The blocks don't slide against each other, do they? Then displacement from the frame of reference of block is ZERO. Get yourfacts straight. And I'm outta here.
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Autobots, Recon. |
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7 Apr 2010 21:50:57 IST
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Dude.. why is this little voice in my head that keeps on talking when am reading ur posts.. Give me some time dude.. Iam not reading ur posts.. Its hard to think with the little guy talking..
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IIT |
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7 Apr 2010 21:54:55 IST
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Take all the time you want, but please get this sorted out. JEE is 3 days away!
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7 Apr 2010 22:00:05 IST
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DUde iam getting 70%+ in all mock tests in physics.. am just to nervous to think right now... But theres something magical associated with ur posts dude.. I JUST CAN READ THEM.. I am getting distracted before i come to the end
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IIT |
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7 Apr 2010 22:01:59 IST
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Would it help if I translated it into Espagnol? And 70%+ is really good! Means you are scoring above 300 in all mock tests! Wow!
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7 Apr 2010 22:08:23 IST
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naa I ve been screwing chemistry and maths.. am getting 160 something :(
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IIT |
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7 Apr 2010 22:09:41 IST
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@El cangri de tontos: you seem to copy from other sites but do u read them, the answer to u r question is given there
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7 Apr 2010 22:10:40 IST
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Dude... AM not thinking right now... My anti depressants are kicking in.. I tend to work mechanical in the evenings..
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IIT |
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