OCR Physics A G481 Mechanics [Thursday 17th May 2012]

Reply 20

ohmyBEAUT

2

Good luck with the exam guys!
Really not ready for this though.

Reply 21

emah123

5

Original post by emzics

I took this exam in January earlier this year and got a D. Thought I was ready but I may have been wrong.. So I started revising extra early for the exam tomorrow :biggrin:

lol not really i started yesterday. But it seems pretty okay. Anyway I thought I would give some tips! (not that many will take my advice after saying that)
But the best thing to do is go through every single past paper on the MEI website and with every question you get wrong, write all the solutions down and memorise how to do them. Although that may be hard the day before the exam so maybe a few of the past papers will do!
Good luck although I hope you all do dreadfully to lower the grade boundaries for me. (If you could that would be great! Cheers.)

sorry could you give me the link to the MEI website???

Reply 22

Coffee_Please

hey guys, what are all the experiments that we need to know the details about?
ones i can think of so far are
-free fall of ball
-inclined plane with little car
-stretching of a metal wire

are there any more!?

Reply 23

User944645

2

MEI is for the mechanics module of A level maths, not physics I'm pretty sure...

Reply 24

patterson

11

Original post by tommeh_

has anyone got the january paper from this year? i took the exam but i want to retake it in preparation for tomorrow :smile:

thanks

mechanics jan 2012 is attached plus its markscheme. take a look, pls revise , lets all get A's lol

G481-01Jan12.pdf440.6KB

G481_MS_Jan12.pdf111.6KB

Reply 25

patterson

11

read young modulus experiment

galileo and aristottle experiment and their observations.

for young moduls, they might give us cross sectional area as mm^-2 like in january 2012 paper. learn how to convert units.

look at prefixes aswell just incase. never know what might happen.

Reply 26

JuxtaposedJames

OP

1

Original post by patterson

mechanics jan 2012 is attached plus its markscheme. take a look, pls revise , lets all get A's lol

Cheeers

Reply 27

ZakRob

2

Original post by Coffee_Please

hey guys, what are all the experiments that we need to know the details about?
ones i can think of so far are
-free fall of ball
-inclined plane with little car
-stretching of a metal wire

are there any more!?

They could also ask how to detemine the centre of gravity, of an object.

These are the marking points they generally want, when they ask how to do the experiment:

1. (Suspend plate/object from a point and then) mark a vertical line on the plate/object
2. use Plumb line to determine a vertical line
3. Hang from another point / place (and draw another vertical line) (wtte)
4. Where the lines intersect gives position of centre of gravity (wtte

Reply 28

patterson

11

who had an exam today?

Reply 29

Sarabande

15

I had RS. It went really well, the paper was perfect for my needs. I got a C in this in January, hoping for an A. Hopefully.

Reply 30

EmilyBea

1

what do you all predict will come up tomorrow?

Reply 31

Kreayshawn

is work done per second the same as power?
can i use p=fv for both of them?

also, how do i do this question:

mark scheme doesn't explain much

Reply 32

Sarabande

15

240 / (\frac{0.5\times10^-3}{2})^2 \times \pi = Stress

Same material therefore same breaking stress.

\frac{F}{A} = Stress

F = A \times Stress

(\frac{15\times10^-3}{2})^2 \times \pi \times Stress = Force

(edited 11 years ago)

Reply 33

TempleQC

1

Original post by Kreayshawn

is work done per second the same as power?
can i use p=fv for both of them?

also, how do i do this question:

mark scheme doesn't explain much

What I did when I did that question was 15/0.50 = 30.
Breaking force equals 240 x 30^2.
Because 15mm is 30times bigger than 0.50.
And the breaking force is proportional to force x factor of increase squared.
Remember breaking force is proportional to speed^2. So I used that to sort of help me. Hope it makes sense.

Reply 34

Sarabande

15

Both methods get the same answer but breaking force is proportional to speed^2? Don't you mean BRAKING DISTANCE is proportional to speed^2?

Reply 35

Coffee_Please

Original post by ZakRob

They could also ask how to detemine the centre of gravity, of an object.

These are the marking points they generally want, when they ask how to do the experiment:

1. (Suspend plate/object from a point and then) mark a vertical line on the plate/object
2. use Plumb line to determine a vertical line
3. Hang from another point / place (and draw another vertical line) (wtte)
4. Where the lines intersect gives position of centre of gravity (wtte