OCR Physics A G484 - The Newtonian World - 11th June 2015

http://www.chatzy.com/78880695828818

if you want to discuss answers quicker :smile:

Reply 1161

Raizel

3

Original post by precious maro

Does anyone have the June 2014 markscheme?

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https://drive.google.com/folderview?id=0B1ZiqBksUHNYfnBrUUlyc0Rfdm8tekpIUFZ4cGZicEpwd25jYUNLZ3c2NG9WRDZRa2dJQkE#

Reply 1162

chem@uni

9

What are experiments we need to know?

Reply 1163

Futuremedic2096

analyse circular orbits in an inverse square law field by relating the gravitational force to the centripetal acceleration it causes
What does this mean

Reply 1164

OliviaLin

Would it be wise to pull an all nighter for this morning exam? :frown:

Reply 1165

Tom102

13

Original post by The Room Student

I'm probably panicking and overcomplicating but...

What exactly does the specification mean when it says:

"Select and use x = Acos(2πft) or x = Asin(2πft) as solutions to the equation a = –(2πf)^2x"

Do they mean 'work out (or read-off) x from a graph' and then 'bung x into the latter equation to calculate a' or?

Sorry this is a bit late. Thanks in advance to anyone that can help me out here.

Cos for when you've pulled it down all the way (think of a cos graph)

Sin for when you get it a slight impulse at the eq position.

(difference between sin and cos graphs is an easy way to remember)!

Reply 1166

username1355674

1

Studentroom link to unofficial mark scheme for June 2014 paper: http://www.thestudentroom.co.uk/showthread.php?t=2712461

Reply 1167

Tom102

13

Original post by OliviaLin

Would it be wise to pull an all nighter for this morning exam? :frown:

More likely to make stupid mistakes due to tiredness imo

Reply 1168

Futuremedic2096

Original post by Futuremedic2096

analyse circular orbits in an inverse square law field by relating the gravitational force to the centripetal acceleration it causes
What does this mean

Please help, improbably know just don't understand the meaning

Reply 1169

Tazmain

Original post by OliviaLin

Would it be wise to pull an all nighter for this morning exam? :frown:

https://www.youtube.com/watch?v=UFM3Vohpj_4

Sleep. Trust me, been up for 36 hours and I can't concentrate on anything :u:

Reply 1170

Raizel

3

Reply 1171

Jim997

Original post by Tom102

Cos for when you've pulled it down all the way (think of a cos graph)

Sin for when you get it a slight impulse at the eq position.

(difference between sin and cos graphs is an easy way to remember)!

Sorry. But how would they word the question? Like what lets you know to use sin? Is it so say at t=0 the displacement is zero what would the displacement be at t =1.2? Then would you use the sin variation?

But if it was at Max displacement (A) at t= 0s you would then use the cos variation to find it at t=1.2s?

Sorry but we were never actually taught this! Bloody joke! If someone can let me know if that's right that would be great! Thanks

Reply 1172

username1060297

21

Original post by HMusa

it doesnt matter if you cant remember but do you remember the page where the experiments are mentioned or thereabouts?also what are each of the circuits suppose to look like? as in how is an electrical heater suppose to be drawn lolthanks

Page 70 of official textbook there is SHC experiment.
Page 62, again same book, Brownian motion experiment.
And for SHM - pretty much everything there is to cover; so it's an oscillating object (pendulum or mass-spring system) which is moving because of a restoring force (to midpoint) and the respective equation for interpreting graphs and also the energy exchanges. Each of these has a double spread dedicated.

*I don't use/read the official textbook so I can't say I'll be able to answer queries about what's in there.

The symbol for a heater is just a long rectangle with four lines equally spaced lines inside it.

(edited 8 years ago)

Reply 1173

username1060297

21

Original post by OliviaLin

Would it be wise to pull an all nighter for this morning exam? :frown:

I agree with everyone else; go to sleep. Whilst in bed think about some physics topics and what sorts of ideas are taking place or if you want, read a textbook/revision guide. Good luck :smile:

Reply 1174

papayarama

Original post by OwenEllicott1996

At the start of the June 2014 mark scheme, it says any question where 2.s.f of data is given it will allow 2.s.f or more. Any answer which give less, so 1, will only lose one mark even if they do it again. Also if the answer is given to 2.s.f and it requires more then another mark will be lost and again if you repeat it you won't lose another mark so rule of thumb give 3.s.f and you should be fine

Thank you!

Reply 1175

Ellios

14

Original post by Futuremedic2096

Please help, improbably know just don't understand the meaning

It means using F=mv^2/r along with F=GMm/r^2.
You can eliminate F to get mv^2/r=GMm/r^2.
This can be used to calculate orbital radii or masses of planets etc...

Reply 1176

papayarama

Original post by OliviaLin

Would it be wise to pull an all nighter for this morning exam? :frown:

If you're going to pull an all nighter, AT LEAST allocate a 90 minute nap before you head to the exam, that way you fully refresh your brain. Do not use a regular alarm so your sleep cycle does not get distracted and you end up feeling groggy, instead download a sleepbot app which will track your movements and will wake you up when you're most active but set the cycle to at least 90 minutes. (But still set an alarm just incase / ask someone to wake you up). lol anyway I'm speaking from experience, I have gotten D's from pulling all nighters before but I managed to get As with the 90 minute naps (especially this exam needs ton of brain processing) !!! Wake yourself up with coffee but only if you're accustomed to it or don't suffer anxiety! :smile:

Goodluck tomorrow!

Reply 1177

Exaltation

Original post by papayarama

If you're going to pull an all nighter, AT LEAST allocate a 90 minute nap before you head to the exam, that way you fully refresh your brain. Do not use a regular alarm so your sleep cycle does not get distracted and you end up feeling groggy, instead download a sleepbot app which will track your movements and will wake you up when you're most active but set the cycle to at least 90 minutes. (But still set an alarm just incase / ask someone to wake you up). lol anyway I'm speaking from experience, I have gotten D's from pulling all nighters before but I managed to get As with the 90 minute naps (especially this exam needs ton of brain processing) !!! Wake yourself up with coffee but only if you're accustomed to it or don't suffer anxiety! :smile:

Goodluck tomorrow!

Wow there are actually some nice people on TSR. Not just arrogant Nerds :P

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Reply 1178

papayarama

Original post by verello12

How are you guys feeling about this one. I feel like it's easy to f*** it up since a small difference in marks will have a big effect on your grade.

I've dont all of the 2014-2010 past papers about 3 times each, been getting 50-60 marks but I'm still scared some word question will throw me off or im gonna forget to convert km to m for example, but my biggest worry is time. Time is my biggest enemy, I don't even know what the point is of having such a tight time limit, make it 1hr 45min or something so everyone can attempt each question with no problem...

I agree, it's so easy to mess it up and OCR needs to make this exam at least 1h30m as some questions you need to get your head around :-/ But anyway, maybe it's just me because I don't work well under time-pressure.

Reply 1179

OliviaLin