IAL Physics Unit 1 - 19th May 2015

Scroll to see replies

Reply 20

Ambrina

Original post by Elina_Trixie

What did you guys write for the first part of the towing car question??

what was the questions? was it horizontal component? i wrote it was 80cos65 if that was it

Reply 21

andy3nieto

Original post by Ambrina

I was most confused in the student jumping graph question and the acceration-time and displacement time question. What about you guys?

do you mean the athlete jumping question iwth the reaction force-time graph??? that was trickyy :frown:

Reply 22

andy3nieto

Original post by Ambrina

what was the questions? was it horizontal component? i wrote it was 80cos65 if that was it

i wrote that the tension would push the car over the bump...but then because there was like a slope the gravitational field force would accelerate the car down the slope, and so even if the towing car stopped moving the other car could still move

Reply 23

Ashley_01

Found it really tough so much less time nd so much to think ..

Reply 24

Elina_Trixie

Original post by Ambrina

what was the questions? was it horizontal component? i wrote it was 80cos65 if that was it

Not that one... it was the question with a car being towed with a nylon strap... they said us why the car kept moving...

Reply 25

Ambrina

Original post by andy3nieto

do you mean the athlete jumping question iwth the reaction force-time graph??? that was trickyy :frown:

yes, sorry the athlete* jumping was what I meant. Even i found that the hardest considering it was worth quite a few marks too

Reply 26

Ambrina

Original post by Elina_Trixie

Not that one... it was the question with a car being towed with a nylon strap... they said us why the car kept moving...

Oh sorry. I was very unsure about that too. I wrote that the stretched nylon strap has E.P.E and so it has a force which keeps the car moving.
I think it's wrong though

Reply 27

AutismChan

is a hadron a lepton or a volt ....

Reply 28

Elina_Trixie

Original post by Ambrina

Oh sorry. I was very unsure about that too. I wrote that the stretched nylon strap has E.P.E and so it has a force which keeps the car moving.
I think it's wrong though

I wrote something similar. I wrote that the E.P.E of the nylon gets converted to K.E of the car. I dunno if that's correct... made sense to me during the exam :P

Reply 29

ZuhairNadeem98

I really screwed up in the last two questions ; 18 and 19 ....|
I mean i could do it if only i had more time......
left many many things here and there cuz of the time limit and the fact that this one has 19 questions rather than 17/18 questions you would expect.
I really hope the grade boundaries are around 50-60 something
Now I am starting to wonder if I will even get a B or C in this paper , hell I dunno what will happen in unit 2 which is on 4th June...
God help us all

Reply 30

Ambrina

Original post by Elina_Trixie

I wrote something similar. I wrote that the E.P.E of the nylon gets converted to K.E of the car. I dunno if that's correct... made sense to me during the exam :P

That sounds about right, hahah i wish i'd remembered about transfer of energy

Reply 31

A84

I was done 15 mins before the exam finished, but yes some stuff were hard. I think ill get around 55 hopefully.
I also messed up in mcqs. what was the swimmer one? ppl said depth but I mistakenly chose velocity which is wrong.. and what was the bouncing ball mcq? I did A but ppl said it was C or something

Reply 32

MadZler

Found the paper quite easy, defiantly easier than last year's! Got a maximum height of 0.32m for the athlete though I not so sure about that because I used initial velocity as 0 there :P Quite happy they didn't ask too much about materials and stuff!

Reply 33

Ambrina

Original post by A84

work done= 1/2 mv^2 and mgh. so mass, height and velocity do affect the work done. The depth does not. That's what i chose as well.
For the bouncing ball i selected the graph which was a straight horizontal line with gradient zero because total energy of any system remains constant (energy can neither be created nor destroyed) and they told us to ignore air resistance so energy surely stays same throughout, I think

Reply 34

examgirl414

Original post by MadZler

why was the speed less on the non shallow bit ( outside area)

Reply 35

MadZler

Original post by examgirl414

why was the speed less on the non shallow bit ( outside area)

On the outside you had turbulent flow forming, which is faster than laminar, while the inside kept being laminar.

Reply 36

examgirl414

Original post by MadZler

On the outside you had turbulent flow forming, which is faster than laminar, while the inside kept being laminar.

i said because of turbulent flow. but if you have turbulent flow it means its travelling slower. not faster right?

and when drawing the lines going from turbulent to lamina do we have to draw every single line? i did 5 out of 6

Reply 37

Moe21

Anyone done the January 2015 as their mock? That was so much easier and only required 53 for an A, I think this one will have lower grade boundaries so hopefully I can scrape a B and do well in my unit 2.

Reply 38

MadZler

Original post by examgirl414

No its the other way around, you can check. I don't think quantity really matters, I think 5 is sufficient if drawn correctly.

Original post by Moe21

I did that paper and to me it was way harder, obviously the grade boundaries were consequently lower, but still found it harder than the one we did today. Maybe I was just better prepared for today :P