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Author Topic: The Exam Defied The Laws Of Mechanics.  (Read 2311 times)

Offline [Spy]

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The Exam Defied The Laws Of Mechanics.
« on: May 20, 2010, 08:43:14 am »
guys in mechanics paper 42, the coefficient of friction was 1.62 right?

you cant possibly get a coefficient greater than 1 :S

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Offline islu_jf

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #1 on: May 20, 2010, 08:47:21 am »
hey i got the same number 2/... i was going to change it.. bt NO TIME>!!
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Offline [Spy]

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #2 on: May 20, 2010, 08:54:05 am »
no it is im 100% sure, but theoretically its wronnggg :S
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nid404

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #3 on: May 20, 2010, 09:12:10 am »
no it's not....where did you read that co-eff of friction can't be greater than 1...it can very well be

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #4 on: May 20, 2010, 09:17:59 am »
only 2 percent of all materials on earth have a coefficient of friction greater than one! and plus, not in the book or in any paper was there a coefficient greater than one! it was pissing off, i wasted time revising the question a million times! but thank god the rest was dead easy :)
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nid404

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #5 on: May 20, 2010, 09:21:14 am »
a value above 1 merely implies that the force required to slide an object along the surface is greater than the normal force of the surface on the object.

stop bothering  :P
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Offline islu_jf

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #6 on: May 20, 2010, 09:22:08 am »
What did u gt for Question 5 part (ii) ??
it was about the mgh and work done against friction???
what was the hight?
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Re: The Exam Defied The Laws Of Mechanics.
« Reply #7 on: May 20, 2010, 09:22:36 am »
hahaha okay okay im sorry :P
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Re: The Exam Defied The Laws Of Mechanics.
« Reply #8 on: May 20, 2010, 09:23:15 am »
Quote from: islu_jf on May 20, 2010, 09:22:08 am
What did u gt for Question 5 part (ii) ??
it was about the mgh and work done against friction???
what was the hight?

part i) the velocity was 3

and the height was 0.32 m
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Offline XaM!!

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #9 on: May 20, 2010, 09:23:17 am »
i ****ed 1 part... i couldnt prove v=3.95... because of no time...
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nid404

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #10 on: May 20, 2010, 09:24:47 am »
Quote from: Spy on May 20, 2010, 09:23:15 am
part i) the velocity was 3

and the height was 0.32 m

yup :)
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Offline islu_jf

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #11 on: May 20, 2010, 09:33:11 am »
Ohh...  i got the hight as 0.13 and then the mgh is 0.31!! which is the same as the WD against frictional force!!!!!
i ddnt do gd in the last question.. no time man..
it was Ok .. bt very long//
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Re: The Exam Defied The Laws Of Mechanics.
« Reply #12 on: May 20, 2010, 09:49:26 am »
:)


don't worry, you'll do good :)
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Offline SAKS10111

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #13 on: May 20, 2010, 10:37:37 am »
i also got the co-eff as 1.62, and i know its right, because it wasn't even a very complicated question. hope its right
in the 5th question, instead of taking the height as .45 m, i took it as 45 m :( my working and method is totally right, but my figures are obviously wrong, do you think i'd get some consideration marks for that? that was 7 marks, the rest of the paper i think i did pretty good.
what was your last answer, the speed/velocity? i got 5.4 i think
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Offline @ce/AJ

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Re: The Exam Defied The Laws Of Mechanics.
« Reply #14 on: May 20, 2010, 10:38:43 am »
I was getting something above 1 as well so I'm like this isn't possible and changed my answer to 0.6.
Tht's 3 marks gone!  :'(
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