Qualification > Math
Mechanics Question
thecandydoll:
I feel so upset screwing up my p1 math.
i think i land up with 54/75 or something
so doing well in mechanics,is there a chance i can get a b?
I have a doubt.
Mechanics Paper 4.M/J 2003.
q2
elemis:
First we draw a set of axis. Then we place the forces on them as shown in the first pciture.
As they are asking for the resultant force in the direction PQ we must resolve for forces in the y axis.
i.e. : 10 cos 30 + 10 cos 30 - 6 cos 60= 14.3 N
The direction 'perpendicular to PQ' is basically the x axis. So we resolve forces in the x axis.
10 cos 60 + 6 cos 30 - 10 cos 60 = 5.20 N
For the last part we know the magnitude of the horizontal and vertical forces. The resultant is the red line. (see 2nd pic)
Using Pythagoras Theorem : 5.22 + 14.3 2 = 231.53
Hence, = 15.2 N (3 s.f.)
nid404:
--- Quote from: asiftasfiq93 on October 14, 2010, 08:45:18 pm ---Garfield u are wrong ::).....frictional force is an opposing force so it always try to decelerate an object :)
--- End quote ---
negative acceleration...my bad -_-
Deadly_king:
--- Quote from: thecandydoll on October 15, 2010, 03:04:53 am ---I feel so upset screwing up my p1 math.
i think i land up with 54/75 or something
so doing well in mechanics,is there a chance i can get a b?
I have a doubt.
Mechanics Paper 4.M/J 2003.
q2
--- End quote ---
Hmm........I guess it is possible :)
You need to catch up in p4 though!
thecandydoll:
Where does the 6cos60 come from :(
OMGGGG I DONT GETTT IT.
brain has shutdown.
--- Quote from: Ari Ben Canaan on October 15, 2010, 04:44:51 am ---First we draw a set of axis. Then we place the forces on them as shown in the first pciture.
As they are asking for the resultant force in the direction PQ we must resolve for forces in the y axis.
i.e. : 10 cos 30 + 10 cos 30 - 6 cos 60= 14.3 N
The direction 'perpendicular to PQ' is basically the x axis. So we resolve forces in the x axis.
10 cos 60 + 6 cos 30 - 10 cos 60 = 5.20 N
For the last part we know the magnitude of the horizontal and vertical forces. The resultant is the red line. (see 2nd pic)
Using Pythagoras Theorem : 5.22 + 14.3 2 = 231.53
Hence, = 15.2 N (3 s.f.)
--- End quote ---
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