AQA Physics Unit 4 Thread - JAN 28th 2010 (Post Exam)

Watch this thread
mazchaz
Badges: 0
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 12 years ago
#1
Unless there is already a thread for this and I have failed to find it what are your thoughts for those of you taking the exam?

I have found the magnetic stuff quite hard?

Cheers
Henry
0
reply
2710
Badges: 18
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 12 years ago
#2
The magnetic stuff is quite hard, expecially the flux linkage and emf induced stuff. Im finding the Dynamo/Motor Rule questions quite easy though.

I'm also struggling with Gravitational/Electrical Potential. omg, so much to revise >__>
0
reply
Ali_c9
Badges: 0
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
Report 12 years ago
#3
Is this Physics A?
0
reply
Twilliams224
Badges: 0
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report 12 years ago
#4
personally im found gravitational fields the hardest, but electric fields helped me to understand it more so it has clicked now
0
reply
Mitch92uK
Badges: 2
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report 12 years ago
#5
Yeah I'm doing this. First time doing multiple choice questions since GCSE - should be interesting!!

Why does the title have "post exam" in brackets? Am I missing something ... ?
0
reply
NAJC
Badges: 0
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#6
Report 12 years ago
#6
Could someone tell me what percentage of the paper is composed of multiple choice? Also, do we have both parts/sections of the paper to complete at the same time? If so then we can use both parts together which will help as some questions will have a slight overlap.
0
reply
Twilliams224
Badges: 0
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#7
Report 12 years ago
#7
there are 50 marks for the written bit and 25 for the multiple choice bit, i think anyway. yeah that could help but if we did have both parts a the same time the exam board would be wise to it.
0
reply
Mitch92uK
Badges: 2
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#8
Report 12 years ago
#8
(Original post by NAJC)
Could someone tell me what percentage of the paper is composed of multiple choice? Also, do we have both parts/sections of the paper to complete at the same time? If so then we can use both parts together which will help as some questions will have a slight overlap.
25 marks multiple choice, 50 written. 1 hr 45 mins to do both sections.
0
reply
Ali_c9
Badges: 0
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#9
Report 12 years ago
#9
Okay I assume you guys are doing Physics A. I'm doing Physics B. You guys get multiple choice questions? Whaaaaat!?
0
reply
trollman
Badges: 12
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#10
Report 12 years ago
#10
i think im going to fail thsi exam
0
reply
vying
Badges: 0
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#11
Report 12 years ago
#11
I need serious help on this paper ! I don't quite understanding anything. Does anyone have any revision guides on the topics of unit 4?
0
reply
EasyTiger
Badges: 3
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#12
Report 12 years ago
#12
Theres a CGP one, and yeah, I got a bad feeling about this one.
0
reply
Robofish
Badges: 0
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#13
Report 12 years ago
#13
well if anyone has any questions, ask away!
0
reply
NAJC
Badges: 0
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#14
Report 12 years ago
#14
(Original post by Robofish)
well if anyone has any questions, ask away!
Is damping always in the opposite direction to velocity or displacement? How do you know when to use which Fleming hand rule?
0
reply
Danny A G
Badges: 0
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#15
Report 12 years ago
#15
(Original post by NAJC)
Is damping always in the opposite direction to velocity or displacement? How do you know when to use which Fleming hand rule?
Flemings left hand rule is for converting electricity into motion. The right hand rule is for converting motion into electricity.
I'm fairly sure damping is always in the opposite direction to the velocity, as it is trying to reduce the velocity each cycle.
0
reply
NAJC
Badges: 0
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#16
Report 12 years ago
#16
(Original post by Danny A G)
Flemings left hand rule is for converting electricity into motion. The right hand rule is for converting motion into electricity.
I'm fairly sure damping is always in the opposite direction to the velocity, as it is trying to reduce the velocity each cycle.
Oh, so when you are moving a magnet through an electric field, or a coil through a magnetic field, you use the right hand rule? And for the left hand rule you use it when?

But doesn't damping also oppose the amplitude of the oscillation, as this decreases with every cycle?

Thanks for the reply, +rep.
0
reply
Ram92
Badges: 1
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#17
Report 12 years ago
#17
(Original post by NAJC)
Oh, so when you are moving a magnet through an electric field, or a coil through a magnetic field, you use the right hand rule? And for the left hand rule you use it when?

But doesn't damping also oppose the amplitude of the oscillation, as this decreases with every cycle?

Thanks for the reply, +rep.
The left hand rule = motor effect
Right hand = generator

And yes the amplitude will be increasing if the velocity is in that direction. The velocity and amplitude are in the same direction
The damping is like a friction which reduces the amplitude in each cycle.
0
reply
Chriz M
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#18
Report 12 years ago
#18
(Original post by NAJC)
Is damping always in the opposite direction to velocity or displacement? How do you know when to use which Fleming hand rule?
Velocity, so which every way it moves, it has a force acting against it. The bit I don't like is the resonance area, especially explaining it.
0
reply
AG_SILVA
Badges: 1
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#19
Report 12 years ago
#19
from my textbook i know that the negative of the potential gradient is the electric field strength...what can this tell you about a field, i.e what does a positive electric field strength tell you about the direction of the field etc (same for negative) im confused on this
1
reply
Ram92
Badges: 1
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#20
Report 12 years ago
#20
http://store.aqa.org.uk/qual/gce/pdf...GPHYA4ASQP.PDF
hi i need help on the above link

Q 14 - where does the 2 come from? should it not be 2 on the top??

Q- 16 can someone help please

Q - 17 - I understand it accelerates as it changes direction but does it not also go in a circular motion?

THe answers are at the bottom

Also if you have not seen this paper before I hope it helps! and i hope you help me lol
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How did your AQA A-level Psychology Paper 1 go?

Loved the paper - Feeling positive (269)
42.36%
The paper was reasonable (261)
41.1%
Not feeling great about that exam... (58)
9.13%
It was TERRIBLE (47)
7.4%

Watched Threads

View All