Qualification > Sciences
ALL CIE PHYSICS DOUBTS HERE !!!
Deadly_king:
--- Quote from: Ivo on October 16, 2010, 11:02:59 pm ---Thanks, for your help. Great explanation, now I get it! + rep for you! (By the way, which method would you advise?)
--- End quote ---
You're welcome :)
Hmm.....that will depend on you. Use the method you find easier.
But the question ask for the work done first, so i believe the first method would be shorter ;)
Ivo:
OK, I think this is slightly harder than the previous ones that I am struggling with. I know that the tension is the same all round the system, but I don't know which directions each one are (could someone draw the arrows to show them, thanks!)
My (wrong) answers:
a) For equlibrium to be achieved, forces are balanced, zero resultant.
b) i) 141N
ii) 131N
iii) No idea! Difference is not 0N, I'm stuck!
Many thanks in advance!
S.M.A.T:
I got the same answer like U in b) i) ii) ....what is the correct answer ??? ???
b iii)because the frictional force in the bed is equal to the horizontal force exerted by the rope so resultant force is zero
ashish:
--- Quote from: Ivo on October 17, 2010, 09:35:38 am ---OK, I think this is slightly harder than the previous ones that I am struggling with. I know that the tension is the same all round the system, but I don't know which directions each one are (could someone draw the arrows to show them, thanks!)
My (wrong) answers:
a) For equlibrium to be achieved, forces are balanced, zero resultant.
b) i) 141N
ii) 131N
iii) No idea! Difference is not 0N, I'm stuck!
Many thanks in advance!
--- End quote ---
your answers are not wrong
i got the same
look at the picture
there is a constant tension(10*8) in the string throughout the system i took g as ten
when the string has inclined it will cause an additional force
additional horizontal force will be 80cos40 =61.3
total force will be =61.3+80
=141 N
additional vertical force will be 80sin40 = 51.42
total force will be = 51.42+80
=131.42 N
Deadly_king:
--- Quote from: asiftasfiq93 on October 17, 2010, 12:33:10 pm ---I got the same answer like U in b) i) ii) ....what is the correct answer ??? ???
b iii)because the frictional force in the bed is equal to the horizontal force exerted by the rope so resultant force is zero
--- End quote ---
Do you mind to explain how you got your answers ???
b)(iii) It's not necessary that resultant is zero. The frictional force between the bed and the body of the skier may be greater or equal to the horizontal force.
@ ashish : Weight cannot be the answer since the latter acts vertically downwards ans will have no horizontal component ;)
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