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# AQA MM1B - Mechanics 1 -Tuesday 21st June 2016 watch

1. Did no one get around 07.6 for the bearing ? :|
2. (Original post by koolgurl14)
q8)
particle a:
v=u+at for i component
v=4+0.2t
particle b:
v=u+at for i component
v=6-0.2t
these velocities will be the same because travelling parallel to each other horizontally
4+0.2t=6-0.2t
0.4t=2
t=5 then sub it into the r=ut+1/2at^2 for each particle
i can't remember any other numbers but there was 32.5 and 46.25 something like that.
not sure if my answer is right but i got 80.6 in the end
Got the exact same but think the answer is t=12 and 106m
3. (Original post by GabbytheGreek_48)
2c0 was a displacement so wouldnt you also have to put an angle if you didnt leave it as I and J vectors
i did think about that and im not 100% but usually when they ask for displacement they want the distance from the origin
4. (Original post by wil_is_he)
q8 for people that haven't done C4 yet!!Parallel velocities means that the gradient of the magnitude of the velocities are the same, so j/i=j/i for A and B's velocities. Do some rearranging, t^2 cancels, get t=12, use this in position vector to get 106
how r we meant to get this if we're not doing A2 unfair really
5. (Original post by Busted838)
unofficial mark scheme

2a. p-4 i q+12 j (1)
b. p=14 q=-17 (4)
c. distance 17.9m (3)
Part C asked for displacement, not distance, and t=12 for Q8, so distance would be 106m.
6. (Original post by Peter Wilkinson)
Did no one get around 07.6 for the bearing ? :|
3 figure bearings are without decimal place was it'd round up to 008
7. (Original post by Peter Wilkinson)
I'm sure 2c was displacement, not distance and 5c was 1.19 (to 3sf)
I got 1.12m exactly for 5c :/
8. (Original post by georgiashayes)
how long had the airplane been in the air for to travel 240 metres? think i read it wrong ffs
t=20
9. (Original post by Busted838)
i did think about that and im not 100% but usually when they ask for displacement they want the distance from the origin
they usually say the magnitude of displacement if the want that or just distance
10. (Original post by koolgurl14)
q8)
particle a:
v=u+at for i component
v=4+0.2t
particle b:
v=u+at for i component
v=6-0.2t
these velocities will be the same because travelling parallel to each other horizontally
4+0.2t=6-0.2t
0.4t=2
t=5 then sub it into the r=ut+1/2at^2 for each particle
i can't remember any other numbers but there was 32.5 and 46.25 something like that.
not sure if my answer is right but i got 80.6 in the end
Velocities were not equal but parallel, so you cannot just equate them as I think you may have done. One was a multiple of the other, but not necessarily a multiple of 1.
11. (Original post by Arima)
3 figure bearings are without decimal place was it'd round up to 008
Uh yeah I forgot to do that :/ 1 mark lost right?
12. (Original post by LiesandAlibis)
I got 1.12m exactly for 5c :/
think i also got 1.12
13. for question 7, was the horizontal velocity 12cos50 or something, I can't remember what the initial figures were when setting up the question. Someone help lol
14. (Original post by A Slice of Pi)
Can anyone remember this 10 mark question? I'll have a go at it
I can do some if it... Hopeully others wilk fill in after.

2 helicopters A and B,
A is at origin, B is at position (maybe 50i 40j? Someone needs to help)
A has acceleration (-0.2i + 0.1j), B: (0.2i - 0.1j)
Cant remember inial velocity...
Q: What is the distance A to B when their velocities are parallel. Answer=106. If others could fill in gaps thatll help. You can either do c4 method or gradient method, t=12
15. (Original post by LiesandAlibis)
I got 1.12m exactly for 5c :/
agreed

16. Ignore the pencil line
How are people getting 43 newtons for T
17. (Original post by Ano123)
Velocities were not equal but parallel, so you cannot just equate them as I think you may have done. One was a multiple of the other, but not necessarily a multiple of 1.
10 more marks gone
18. (Original post by wil_is_he)
I can do some if it... Hopeully others wilk fill in after.

2 helicopters A and B,
A is at origin, B is at position (maybe 50i 40j? Someone needs to help)
A has acceleration (-0.2i + 0.1j), B: (0.2i - 0.1j)
Cant remember inial velocity...
Q: What is the distance A to B when their velocities are parallel. Answer=106. If others could fill in gaps thatll help. You can either do c4 method or gradient method, t=12
A was (8i+ 4j) and B was (6i + 9j)
19. How many marks would you lose for t=5?
20. (Original post by gcsekid)

Ignore the pencil line
How are people getting 43 newtons for T
R = Tsin(6) +49

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