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# AQA Physics PHYA4 - Thursday 11th June 2015 [Exam Discussion Thread] watch

1. (Original post by NotYourType)
2 A ball is thrown vertically down towards the ground with an initial velocity of 4.23 m s–1. Theball falls for a time of 1.51 s before hitting the ground. Air resistance is negligible.
The ball makes contact with the ground for 12.5 ms and rebounds with an upwardsvelocity of 18.6 m s–1. The mass of the ball is 46.5 g.
(i) Calculate the average force acting on the ball on impact with the ground. magnitude of force = ................................ .................. N direction of force ................................ ......................[4]
(ii) Use conservation of energy to determine the maximum height the ball reachesafter it hits the ground. height = ................................ ............. m [2]

how to go abt this question?
http://papers.xtremepapers.com/CIE/C..._s12_qp_21.pdf

The solution to 2(b) as in your PM to me is:

Attachment 372915

At least, as far as I can tell. Please let me know if it's correct. If so, let me know if you have any questions.

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2. Is there an A2 empa physics thread??
3. (Original post by sanil17)
Is there an A2 empa physics thread??
I decided against making it because it is meant to be a controlled assessment without discussion of the content. See a couple of pages back for Lau14's comprehensive guide to the EMPA

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4. I might sound dumb , but what is empa
5. (Original post by NotYourType)
I might sound dumb , but what is empa
Externally Marked Practical Assessment. It's the PHA3X/6X scheme that AQA do as an alternative to the ISA.

Look it up on google and you'll find more information

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6. So we had to do this for homework (who knows if he'll follow through on it) but it seems like a good idea generally - print the relevant pages out of the specification (the ones that bulletpoint what you need to know for each unit), and go through with red/orange/green pens colour coding things depending on how well you understand them. It only takes 10 minutes or so, quick and easy way to higlight (literally!) the areas you need to do the most work on.
7. Please help me out with this question
Attached Images

8. (Original post by Lau14)
So we had to do this for homework (who knows if he'll follow through on it) but it seems like a good idea generally - print the relevant pages out of the specification (the ones that bulletpoint what you need to know for each unit), and go through with red/orange/green pens colour coding things depending on how well you understand them. It only takes 10 minutes or so, quick and easy way to higlight (literally!) the areas you need to do the most work on.
Ah that sounds a good idea! I haven't even looked at the spec 😁😂😂

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9. (Original post by NotYourType)
Please help me out with this question
Attachment 373133
Attachment 373135

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10. Omg!! You're so helpful...but I'm only able to view one picture
11. (Original post by NotYourType)
Omg!! You're so helpful...but I'm only able to view one picture
Sorry!

How about now?

Attached Images

12. I can view all of them now ..thank you

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13. (Original post by CD223)
Ah that sounds a good idea! I haven't even looked at the spec

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It makes everything seem much shorter!
14. (Original post by NotYourType)
I can view all of them now ..thank you

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No worries! Does it make sense?

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15. (Original post by Lau14)
It makes everything seem much shorter!
Ah it's scary how little time is left!

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16. (Original post by CD223)
Ah it's scary how little time is left!

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Don't remind me... just under 8 weeks of classes and then we only have to come in for exams.
17. (Original post by Lau14)
Don't remind me... just under 8 weeks of classes and then we only have to come in for exams.
I'm praying Easter is productive but I already have so many plans for it - aha!
18. (Original post by CD223)
I'm praying Easter is productive but I already have so many plans for it - aha!
Fortunately I seem to have no social life, so I should manage to get plenty done over Easter! Hopefully everything will be really really close to finishing teaching then.
Busy week at the moment though, off to London on Saturday so I have to get everything done over the next three days realistically (and "everything" should be 5 past papers and hopefully the remaining PHYA5 notes).
19. (Original post by Lau14)
Fortunately I seem to have no social life, so I should manage to get plenty done over Easter! Hopefully everything will be really really close to finishing teaching then.
Busy week at the moment though, off to London on Saturday so I have to get everything done over the next three days realistically (and "everything" should be 5 past papers and hopefully the remaining PHYA5 notes).
Woah sounds like things are busy with you at the minute! I have my first EMPA practical tomorrow! Ahh!

I'm sure you do have a social life!

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20. (Original post by CD223)
Woah sounds like things are busy with you at the minute! I have my first EMPA practical tomorrow! Ahh!

I'm sure you do have a social life!

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Should settle down after this week hopefully, back to normal and then Easter anyway. Oooh good luck! (we haven't even started prep yet...).

Well definitely not at the moment :P

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