 Community Discussion Question:
mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Mar 2008 19:21:01 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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yeah i agree but reason out why i am wrong????
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22 Mar 2008 19:23:44 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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i am at loss to understand wat u say @eistien....but i know tht fric force is cal based on normallll... so we llll have to get the net normal actin and tht ll be mg-L as drag force is lifting the plane.....
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22 Mar 2008 19:26:17 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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c this is basically the mistake u r making:
when a car moves fwd the wheel rotates backward...now for the wheel if u c @ the bottom the friction acts fwd so tht v=rw @ bottom..i mean the friction tries to bring it to tht...so the velocity of wheel decreases...
so the vel of axle of wheel which propels car fwd dec...so car moves fwd slowly...so EFFECTIVELY the force of friction acts backward...wat i mean is if u now want to consider the sum lik a block moving to bring it to the same thought process u have to take friction backwards
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22 Mar 2008 19:26:43 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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srini wat im sayin is v.important pls note
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22 Mar 2008 19:27:16 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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but i am sorry i have a doubt but friction is (mu)mg only when it is sliding no not when the wheels are pure rolling no??? in our normal sums we neglect this fact computer and take the system as a point sized object and state the newtons laws when it comes to rotational mechanics it id different no???
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22 Mar 2008 19:27:48 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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srini read above
the crux is basically where friction is acting...on tyre its fwd but effectively on the car it is backword...hope u understand my pt
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22 Mar 2008 19:28:34 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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and why should air drag act in the upward direction when the car is moving in the horizontal direction ur air drag force is given by F=-kv^2 and thus must act in the horizontal only no???
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22 Mar 2008 19:30:58 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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by laws in fluids....the air foce acts to lift the body...so actually when a plane moves with gr8 vel the pressure just above its wing span dec and the plane gets lifted up due to the press diff...so here we take th air drag acting upwards as the plane is going up......thus airdrag acts upwards....hope u got it....rate if usefull...
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The only place where you will find success before hard work is in the dictionary
A winner never quits.....a quitter never wins......
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22 Mar 2008 19:31:46 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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there are 2 things..1 is lift 1 is air drag..they are different..
the air coming directly at the car cause hor force but air near the bottom of the car not @ bottom but say roughly near the headlights get deflected downward due to the curved naure of front bottom and deflect of the ground back onto the car and create upwards force
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22 Mar 2008 19:32:47 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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oh so here it is not governed by that formula F=-kv^2 ah???
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22 Mar 2008 19:36:12 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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tht is true near the windshield n all but not near the headlights due to the deflection i mentioned
did u understand my pt of effective dir of friction???
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22 Mar 2008 19:37:15 IST
Subject: mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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i think u r all knocking u r heads on this issue..lets close this here before we r confused tottally.....
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The only place where you will find success before hard work is in the dictionary
A winner never quits.....a quitter never wins......
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22 Mar 2008 20:04:32 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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ok anant is rite but for our sake computer or jungle jalebi please ask this question to an expert no to get the correct answer!!!! where is edison sir or suresan sir!!!! please help us with our doubt gokul i accept your argument!!!
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22 Mar 2008 20:08:30 IST
Subject: Re:mercedes benz ,,,,,,,,,,,,,,,,,,,,,,,,,maybach ..........maclaren waala sawaal
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gud u did cuz u were makin a mistake wid the fric force..tho it is forwrd on wheel,effect on car is backward..thts wat i was tryin 2 say
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