AQA Physics GCSE P2 & P3 [OFFICIAL THREAD]

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.

Reply 1621

Blueyy__

2

Original post by Abdalla__67

nice prediction!

hehe, thanks! :smile:

Reply 1622

amymcavoy22

2

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

Reply 1623

Not_a_horse

13

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?? :frown:

Reply 1624

Palette

14

Is there an unofficial mark scheme yet?

Reply 1625

Smile Generator

5

Original post by Jjohnson919

Would have to reach 0 though

hmm, that's a good point...
Wait, what shape was graph A?

Reply 1626

Smile Generator

5

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?? :frown:

You'll probably get error carried forward, if you did the right method for the second part :smile:

Reply 1627

Jjohnson919

7

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.

Reply 1628

Not_a_horse

13

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

Reply 1629

nocheloche

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?? :frown:

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 :smile:

Reply 1630

morrissies

1

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

Reply 1631

Not_a_horse

13

Original post by Smile Generator

You'll probably get error carried forward, if you did the right method for the second part :smile:

That's a relief because I was aiming to not lose more than 15 marks

Reply 1632

sandvika

3

Posted from TSR Mobile

House please

Reply 1633

Jjohnson919

7

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

Reply 1634

amymcavoy22

2

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 😫

Reply 1635

Jjohnson919

7

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

Reply 1636

lewiswallis

2

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?

Reply 1637

Smile Generator

5

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

Yeah me too, i put B, because the question said 'Take into account air resistance'. I dont think it would fall at a constant velocity either. Imma ask my teacher tomorrow