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Wjec AS ph1 2016

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Original post by student2734
Wasn't the force 800N? Or is that Tcos36 and I'm just being silly😂


The forward force applied (Tension in the towing thing) was Tcos36 so you would use the value you get for T from the previous part of the question (can't remember what T was, I think it was like 988N or something)
Original post by student2734
Wasn't the force 800N? Or is that Tcos36 and I'm just being silly😂


So yeah it was 800N
Yeah I got 115ms-1 or whatever it was for velocity and I also got 20 for the Hooke's Law question! Found it OK, hopefully got an A but yeah very high boundaries I think. Happy with the moments question though, can anyone remember any of their other answers
Also does anyone know how the grade boundaries are agreed on? I thought the top 5%-8% of candidates were given A's etc but my teacher said this is no longer the case. I know the raw marks for an A change each paper so how do WJEC decide on this
Original post by Gracemarielewis
Also does anyone know how the grade boundaries are agreed on? I thought the top 5%-8% of candidates were given A's etc but my teacher said this is no longer the case. I know the raw marks for an A change each paper so how do WJEC decide on this


I was also under the impression that it's the top 8% that get A's so WJEC would alter the boundaries accordingly. If this is not the case then I don't know how else they could decide.
Reply 25
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Nish123
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Original post by student2734
Yeah I got 117m/s so probably some rounding errors :smile: did you have to put the angle that it arrived at the ground as well?


I do not think that is a rounding error, I got that as part of my calculation for the final vertical velocity, however you had to incorporate the unchanged horizontal velocity aswell and use Pythagoras so it was like root(117)^2+(34..)^2 which gives 115..ms^-1. You should still get a mark or so.
Reply 26
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Nish123
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Original post by TheLazyKid
I don't think you had to as it would have said 'magnitude and direction' as well


Yes you did not need the angle, it only stated the final velocity, not direction.

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