(FM1) Further mechanics 1 2019

was very good tbf, couldn't do that one marker in the end that was just weird so just left it :P

Reply 7

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

(edited 4 years ago)

Reply 8

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

Reply 9

yea I may have remembered some of the values wrong

(edited 4 years ago)

Reply 10

for the 1 marker about the speed after the collision I did a lot of work ... it felt like it was 3-4 marks

Reply 11

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

Reply 12

SadToyCats

OP

10

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

Reply 13

SadToyCats

OP

10

Anyone here do fmechanics 2

marks for each q?

Original post by SadToyCats

Anyone here do fmechanics 2

yeah how did u find it

Reply 16

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?

Reply 17

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

Reply 18

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

Reply 19