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As physics p1 MCQS YEARLY ONLY.

T

Trash Can

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man dats a hell lot of problem..!! okay here it goes for 2012: M/J'12 : Q.4,17,18,20,24,26,29,30,35,37,38
O/N'12 :Q.8,12,13,14,16,17,18,19,22,26,30,31
 
crys123

crys123

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i was just solving june 2005. honestly u rock! your explanations are so easy and fun! thank you! u just made my day :)
 
crys123

crys123

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IGCSE O/L student said:
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s11_qp_12.pdf
Questions 10 and 15 please
I have an exam tomorrow
thanks in advance
Click to expand...

15: for a couple, there has to be two equal forces acting in opposite directions. A is wrong because the forces are acting in the same direction. D is wrong because the forces are not acting in opposite directions. then why is C wrong? right? well C is wrong because two forces are in opposite directions but they are working from the same point. why is this a problem then? torque gives rise to a motion that is circular. so if two equal forces are acting from the same point, the meter rule will not rotate. the meter will stationary. try imagining this picture. it might help. :) all the best.
 
IGCSE O/L student

IGCSE O/L student

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crys123 said:
15: for a couple, there has to be two equal forces acting in opposite directions. A is wrong because the forces are acting in the same direction. D is wrong because the forces are not acting in opposite directions. then why is C wrong? right? well C is wrong because two forces are in opposite directions but they are working from the same point. why is this a problem then? torque gives rise to a motion that is circular. so if two equal forces are acting from the same point, the meter rule will not rotate. the meter will stationary. try imagining this picture. it might help. :) all the best.
Click to expand...

I got it. thanks you very much. May God bless you. :)
I have a problem in Q10 too. if you can, please explain
 
M

MathsFan

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No. 10: F is always in the same direction with a because F is the product of a and a scalar m. Note that v is not always in the same direction with F or a.
 
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