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# AQA Physics GCSE P2 & P3 [OFFICIAL THREAD] watch

1. (Original post by AvKar)
It should be 3.6J because the equation is Ek = 1/2 * mass * speed^2

I don't remember the distance q, what was it?
Damn it!! i forgot to half it
2. (Original post by Smile Generator)
I put B, because it accelerated then levelled off, so i thought that showed terminal velocity... idk for sure though
Would have to reach 0 though
3. (Original post by Pra99)
Wow I wasn't taught that. Thanks anyway. How did people get 3.6 and 7.2?
kinetic energy= 1/2 x mass x velocity squared
So its 1/2 x 0.05 x 12^2= 3.6 J

Ek= Ep

Ep= mass x gravitational field strength x height
3.6= 0.05 x 10 x height
u needed to find the height so

Height= 3.6/(0.05x10)
= 7.2m

Hope that makes sense
4. (Original post by morrissies)
on P2 can anyone explain the graph for the rocket?
People are saying either B or C but I just can't understand why it isn't A.
The question said choose the graph that shows how velocity changes as the rocket falls until just after it hits the ground. surely when it hits the ground velocity would have to be 0, because it's no longer moving, and graph A was the only one that finished at the x axis - 0 ????
This is what I was confused about! I put B (I think) because as the rocket falls, it acts like the parachutist that we learn about so the speed starts off low and it gets faster and faster bc it accelerates, until terminal velocity is reached and only B and C showed terminal velocity if I remember correctly. But I do understand where you're coming from as only A got to 0, but it showed a constantly decreasing speed when I feel it should have been increasing.
5. (Original post by Abdalla__67)
nice prediction!
hehe, thanks!
6. (Original post by Not_a_horse)
I think the mass was 0.05 and the speed was 12.
Yeah you're provabaly right, seen so many numbers today I can't remember them all aha
7. If i got the wrong answer for one part and used the same wrong answer in the next part will I still get the marks??
8. Is there an unofficial mark scheme yet?
9. (Original post by Jjohnson919)
Would have to reach 0 though
hmm, that's a good point...
Wait, what shape was graph A?
10. (Original post by Not_a_horse)
If i got the wrong answer for one part and used the same wrong answer in the next part will I still get the marks??
You'll probably get error carried forward, if you did the right method for the second part
11. (Original post by amymcavoy22)
Yeah that's what most people got, I put 0.6 but I'm 99% I got that one wrong so I'm pretty jealous of your likely success right now
Peak. I'm kicking myself right now cause I thought I wa being clever by change 0.05 to 50 when it should've stayed as 0.05.
12. (Original post by AvKar)
This is what I was confused about! I put B (I think) because as the rocket falls, it acts like the parachutist that we learn about so the speed starts off low and it gets faster and faster bc it accelerates, until terminal velocity is reached and only B and C showed terminal velocity if I remember correctly. But I do understand where you're coming from as only A got to 0, but it showed a constantly decreasing speed when I feel it should have been increasing.
I put B too because it showed that the velocity increased rapidly and then levelled out to reach terminal velocity on the graph
13. (Original post by Not_a_horse)
If i got the wrong answer for one part and used the same wrong answer in the next part will I still get the marks??
that's what ive done too- im fairly certain that u only get penalised once for the wrong answer, so im p sure u will be fine so long as u used the right method
14. (Original post by Smile Generator)
hmm, that's a good point...
Wait, what shape was graph A?
Graph A was just a straight, diagonal line
I was unsure about all the options honestly because I didn't think it would fall at a constant velocity (which is what A showed) but none of the others hit the ground at 0 so I'm completely baffled by it
15. (Original post by Smile Generator)
You'll probably get error carried forward, if you did the right method for the second part
That's a relief because I was aiming to not lose more than 15 marks
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17. (Original post by Smile Generator)
hmm, that's a good point...
Wait, what shape was graph A?
Can't really remember if I'm honest
18. (Original post by Jjohnson919)
Peak. I'm kicking myself right now cause I thought I wa being clever by change 0.05 to 50 when it should've stayed as 0.05.
I'm kicking myself right now because I forgot to square the velocity like that's probably the most stupid mistake to possibly make 😫
19. (Original post by morrissies)
Graph A was just a straight, diagonal line
I was unsure about all the options honestly because I didn't think it would fall at a constant velocity (which is what A showed) but none of the others hit the ground at 0 so I'm completely baffled by it
Exactly what I was thinking
20. so worried i hope it's around 46 or 47 for an A*, does anyone have a good idea of what the boundary could be?

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