Gce Maths Past Papers
How can the acceleration be changed by the fact the object is moving up or down a slope?
http://www.ocr.org.uk/Data/publications/past_papers_2007_January/AS_GCE_Mathematics_4728_01_January_2007_Question_Paper.pdf
question 7. II) A) in this paper i cannot understand. looking at the mark scheme didn’t help in the slightest and I would like to understand why it’s 10.8. i cannot see any reason why there would be an answer so high. i cannot also understand why the acceleration would be changed though there are no other forces applied to it. this is the mark scheme:http://www.ocr.org.uk/Data/publications/mark_schemes_2007/L_A_Level_Maths_MS_Jan_07.pdf
I also get 10.8 m/s² . The frictional force is quite high (the plane is rough); the 10.8 result seems a bit high to me too, but I trust my math more than I do my instincts.
The force is different going up and down the plane because, going up, both gravity and friction oppose the motion; the components both point down the plane. But going down, gravity promotes the motion and friction opposes it (the frictional force points up the plane). I get about 1.795 m/s²
Remember, friction always opposes the motion.
Question 3, GCSE Math AQA Higher Paper 1 June 2007 Key stage Quadrilateral angles triangle
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