(FM1) Further mechanics 1 2019 Watch

SadToyCats
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Anyone wanna discuss the paper?
I think it went quite well except for the last question on inequalities on the collision, I couldn't work that one out and got k<-1 lol

What did you guys think?
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skengdo101
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That paper was b o l l o c k s
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NotABot
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The paper went ok in general but got stuck on question 4 😥
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Juliaxxee
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Idk what to think about it. I answered all the questions but idk if I did them right.
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SadToyCats
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The first show that question got me confused af, It was 4 marks for 1 line of working and I was like surely that can't be it lol
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Juliaxxee
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Sameee so i tried to show all the steps but I still don't get how it was 4 marks
(Original post by SadToyCats)
The first show that question got me confused af, It was 4 marks for 1 line of working and I was like surely that can't be it lol
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Harry_Spencer
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was very good tbf, couldn't do that one marker in the end that was just weird so just left it :P
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ChronoSloth
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Mechanics :

Q1: easy prove its 400KW
You should get speed V is 10 and another solution was -65 or something but V>0 .

Q2: slope ...... use work energy resolve the 8m etc... get speed 9.3


Q3: you should use impulse momentum restitution and get e= 7/18 or something


Q4: you should get speed of Q after collision 1 is u(1-ke)/k 1 or something ... that had to be negative to collide so 1-ke<0 k>1/e.... forgot expression for part b

these are the answers I got. can anyone tell me if I got any of them wrong
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Harry_Spencer
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same 7/18 for e
(Original post by ChronoSloth)
Mechanics :

Q1: easy prove its 400KW
You should get speed V is 10 and another solution was -65 or something but V>0 .

Q2: slope ...... use work energy resolve the 8m etc... go speed should be 9.3


Q3: you should use impulse momentum restitution and get e= 8/17 or something


Q4: you should get speed of Q after collision 1 is u(1-ke)/k+1 or something ... that had to be negative to collide so 1-ke<0 k>1/e.... forgot expression for part b

these are the answers I got. can anyone tell me if I got any of them wrong
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ChronoSloth
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yea I may have remembered some of the values wrong
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ChronoSloth
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for the 1 marker about the speed after the collision I did a lot of work ... it felt like it was 3-4 marks
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Harry_Spencer
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feel like it was something that you just had to see but do no working for, it just said write down
(Original post by ChronoSloth)
for the 1 marker about the speed after the collision I did a lot of work ... it felt like it was 3-4 marks
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SadToyCats
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(Original post by ChronoSloth)
Mechanics :

Q1: easy prove its 400KW
You should get speed V is 10 and another solution was -65 or something but V>0 .

Q2: slope ...... use work energy resolve the 8m etc... get speed 9.3


Q3: you should use impulse momentum restitution and get e= 7/18 or something


Q4: you should get speed of Q after collision 1 is u(1-ke)/k 1 or something ... that had to be negative to collide so 1-ke<0 k>1/e.... forgot expression for part b

these are the answers I got. can anyone tell me if I got any of them wrong
Yeah I agree with all of them, I can't remember what I got for 3 but it sounds about right so long as you used the 3 equations coherently you should get most of the marks.

Now that you've explained q4 it all makes sense! I didn't think about it that way at all rip, my statement was V1 > V2 in order for them to collide, but I didn't consider the direction change...

By the sounds of it you probs got all right on that paper good job
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SadToyCats
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Anyone here do fmechanics 2
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ursbhhdb
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marks for each q?
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ursbhhdb
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(Original post by SadToyCats)
Anyone here do fmechanics 2
yeah how did u find it
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Harry_Spencer
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q2 was 13 and q4 was 10 for sure, the first might've been 8 then the second 9, not sure though, has to add to 40 either way
(Original post by ursbhhdb)
marks for each q?
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ChronoSloth
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(Original post by Harry_Spencer)
feel like it was something that you just had to see but do no working for, it just said write down
I probably took the long way... maybe a pattern or some sort cos they say mass of the other ball is Km so i think i apply the formula from part a using different speeds idk
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Harry_Spencer
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really don't know mate, as i said i just left it cuz i thought time would be better spent elsewhere
(Original post by ChronoSloth)
I probably took the long way... maybe a pattern or some sort cos they say mass of the other ball is Km so i think i apply the formula from part a using different speeds idk
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ChronoSloth
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(Original post by SadToyCats)
Yeah I agree with all of them, I can't remember what I got for 3 but it sounds about right so long as you used the 3 equations coherently you should get most of the marks.

Now that you've explained q4 it all makes sense! I didn't think about it that way at all rip, my statement was V1 > V2 in order for them to collide, but I didn't consider the direction change...

By the sounds of it you probs got all right on that paper good job
Thanks for the compliment

My friend also did that same mistake for the range of k ... if you got the speed of the ball then you probably got 8/9 marks. I did do a big mistake on the fp1 paper. I said tan x =3 has no solutions and lost some solutions to some t formula question.
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