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

1. (Original post by Fred Cantoni)
What did people put of the damping question? I completely forgot what it was so I tried to work it out there, I put it has no affect?

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Less damped with ring because of conservation of momentum.
2. (Original post by Fred Cantoni)
Why would it? If you simplify it and treat it like a battery for the same voltage but huger resistance it would have a lower current, why wouldn't that hold for a capacitor?

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I agree, but to be honest; my memory of the paper is already hazy; and as I have said on the student room before:

"If enough people tell you that 1+1=2, you should start to doubt if it's really 3"

Edit: they seem to think that it was the capacitance that was increased.
3. (Original post by simonli2575)
There's more damping without the ring because the ring increases the pendulum's weight and the resistance's effect will be decreased.
That explanation means that there's less damping lol
4. Going to have to perform a miracle in unit 5 to make up for that disaster.
5. Graph for current should start halfway below original and have shallower gradient
7. (Original post by chasvortex)
Little questions:
Gravitational potential is a vector isn't it?
I put the oscillations were less damped with the metal ring - thoughts on this? I reasoned the air resistance force would be constant but as F=ma, the pendulum would deccelerate more slowly so would be less damped.
Gravitational potential is scalar
8. (Original post by gaytown)
Strong username choice for a throwaway.
9. Did people get 1.4 for the height ?

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10. (Original post by EmiratesCaptain)
Gravitational potential is scalar
Apologies that was what I meant - I circled that gravitational potential being a vector as incorrect
11. (Original post by Fvthoms)
Strong username choice for a throwaway.
Well, hey, you never know, I might fail some other exams too
12. Also want to compare; did anybody else have a small amount of B's in their MC paper? I counted 4.
13. Surely the ring has no effect on damping... It was placed in such a way that no extra surface area was provided to the cone.. so no effect on air resistance..
time period is no different, so velocity is no difference and so again air resistance does not change..
14. (Original post by Fvthoms)
Also want to compare; did anybody else have a small amount of B's in their MC paper? I counted 4

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15. (Original post by king cobra)
Did people get 1.4 for the height ?

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Yeah and 8.6 for something else lol cant remember question
16. (Original post by king cobra)
Did people get 1.4 for the height ?

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Yes
17. (Original post by king cobra)

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Do you remember what any of them were?
18. What about the angle in degrees ?

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19. The paper didn't have any monumentally hard questions, just a series of fairly difficult questions which could combine to form a complete disaster

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20. (Original post by king cobra)
What about the angle in degrees ?

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130 something degrees

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