UNOFFICIAL MARKSCHEME!~AQA GCSE Physics Unit 2 25th Janurary NEW SPEC Watch

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Assy123
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#21
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#21
Heya, Do any of you have any idea on what topics the 6 marker is likely to be?
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Arshii
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#22
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#22
(Original post by Ammy97)
I'm doing this exam, feeling very nervous as I really want a good grade haha


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I think everyone wants too! Want to ask questions again? :P
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Ammy97
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#23
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(Original post by Arshii)
I think everyone wants too! Want to ask questions again? :P
Maybe Thursday, get chemistry out the way first yeah!? Haha


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Arshii
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#24
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#24
(Original post by Ammy97)
Maybe Thursday, get chemistry out the way first yeah!? Haha


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Ohh! aha good luck for that ! I don't have a chemistry..mines in the summer
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lolface32
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#25
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(Original post by Arshii)
I think everyone wants too! Want to ask questions again? :P
Would you mind me joining in?
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Arshii
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#26
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#26
(Original post by lolface32)
Would you mind me joining in?
LOL No..
Explain nuclear fission..
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lolface32
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#27
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(Original post by Arshii)
LOL No..
Explain nuclear fission..
A slow moving neutron hits a atom of uranium 235 or plutonium-239.This results in 2 or 3 further neutrons being released which continue a chain reaction. The splitting of the atom allows a release in energy!

Describe how elements heavier than iron are formed?
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Arshii
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#28
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#28
(Original post by lolface32)
A slow moving neutron hits a atom of uranium 235 or plutonium-239.This results in 2 or 3 further neutrons being released which continue a chain reaction. The splitting of the atom allows a release in energy!

Describe how elements heavier than iron are formed?
Yup correct!
Its due to the much bigger stars collapse exploding into the supernova resulting in producing heavier elements.
No heavier elements can be produced by nuclear fusion in the star because too much energy is required..

Explain the ways how the impact force can be decreased in a collision?
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lolface32
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#29
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(Original post by Arshii)
Yup correct!
Its due to the much bigger stars collapse exploding into the supernova resulting in producing heavier elements.
No heavier elements can be produced by nuclear fusion in the star because too much energy is required..

Explain the ways how the impact force can be decreased in a collision?
I have not done that yet? Either that or I just forgot!
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Arshii
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#30
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#30
(Original post by lolface32)
I have not done that yet? Either that or I just forgot!
Really? About crumple zones, seat belts and airbags.. Basically, car safety..?
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Ammy97
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#31
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Does anyone have some practice questions?? (With answers) That they are willing to send me a link to

thanks in advance
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lolface32
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#32
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(Original post by Arshii)
Really? About crumple zones, seat belts and airbags.. Basically, car safety..?
WOOPS! just needed a little refreshing on what it was!

ummm..... Crumple zones are put on the front of the car, this means on impact the reaction time will take longer and so decreasing momentum? I think I just need to revise gone a little rusty!
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Arshii
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#33
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(Original post by lolface32)
WOOPS! just needed a little refreshing on what it was!

ummm..... Crumple zones are put on the front of the car, this means on impact the reaction time will take longer and so decreasing momentum? I think I just need to revise gone a little rusty!
LOL! yeah! aha, I need to go over the radioactivity and the universe...
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Arshii
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#34
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#34
(Original post by Ammy97)
Does anyone have some practice questions?? (With answers) That they are willing to send me a link to

thanks in advance
phys_gc_2901_launch.docphys_gc_2957_launch.doc
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Ammy97
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#35
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LIFE SAVER!!! Thanks so much
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lolface32
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#36
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(Original post by Arshii)
LOL! yeah! aha, I need to go over the radioactivity and the universe...
lol, that is my specialty. The ironnny!

Forces & momentum is easy though.

An artillery gun of mass 2000kg fires a shell of of mass 20kg at a velocity of 120m/s. Calculate the recoil velocity of the gun!
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lolface32
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#37
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#37
(Original post by Ammy97)
LIFE SAVER!!! Thanks so much
I'm kinda stuck on 2) c. ii, where do you get 2? and also d.ii, would it not add up to 54?
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Arshii
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#38
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#38
(Original post by lolface32)
lol, that is my specialty. The ironnny!

Forces & momentum is easy though.

An artillery gun of mass 2000kg fires a shell of of mass 20kg at a velocity of 120m/s. Calculate the recoil velocity of the gun!
p=mv

For the shell: 20kg x 120m/s = 2400 kgm/s
For the gun: 2400/2000 = 1.2 m/s
The recoil velocity of the gun 1.2 m/s

Calculate the resistance, when a circuit is provided with three 3V cells and the current passing through is 0.25mA.
1000mA = 1A
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Ammy97
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#39
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#39
(Original post by lolface32)
I'm kinda stuck on 2) c. ii, where do you get 2? and also d.ii, would it not add up to 54?
I didn't really get any of those... :/

Going to show my physics teacher tomorrow and get some help! If you've worked it out - care to share?
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lolface32
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#40
(Original post by Arshii)
p=mv

For the shell: 20kg x 120m/s = 2400 kgm/s
For the gun: 2400/2000 = 1.2 m/s
The recoil velocity of the gun 1.2 m/s

Calculate the resistance, when a circuit is provided with three 3V cells and the current passing through is 0.25mA.
1000mA = 1A
Hmmmmm no idea. All my sums lead to high resistance and I doubt they are right :confused: What is the answer? And yeah you were right!
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