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

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

Reply 22

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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Reply 23

Original post by Ammy97

Maybe Thursday, get chemistry out the way first yeah!? Haha

This was posted from The Student Room's iPhone/iPad App

Ohh! aha good luck for that ! I don't have a chemistry..mines in the summer :smile:

Reply 24

Original post by Arshii

I think everyone wants too! Want to ask questions again? :P

Would you mind me joining in?

Reply 25

Original post by lolface32

Would you mind me joining in?

LOL No..

Explain nuclear fission.. :smile:

Reply 26

Original post by Arshii

LOL No..

Explain nuclear fission.. :smile:

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?

Reply 27

Original post by lolface32

Yup correct! :smile:

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?

Reply 28

Original post by Arshii

Yup correct! :smile:

I have not done that yet? Either that or I just forgot!

Reply 29

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..?

Reply 30

Does anyone have some practice questions?? (With answers) That they are willing to send me a link to :wink:

thanks in advance

Reply 31

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 :biggrin:

gone a little rusty!

Reply 32

Original post by lolface32

gone a little rusty!

LOL! yeah! aha, I need to go over the radioactivity and the universe... :smile:

Reply 33

phys_gc_2901_launch.doc phys_gc_2957_launch.doc

Original post by Ammy97

Does anyone have some practice questions?? (With answers) That they are willing to send me a link to :wink:

thanks in advance

Reply 34

phys_gc_2901_launch.doc phys_gc_2957_launch.doc

Original post by Arshii

LIFE SAVER!!! Thanks so much :biggrin:

Reply 35

Original post by Arshii

LOL! yeah! aha, I need to go over the radioactivity and the universe... :smile:

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!

Reply 36

Original post by Ammy97

LIFE SAVER!!! Thanks so much :biggrin:

I'm kinda stuck on 2) c. ii, where do you get 2? and also d.ii, would it not add up to 54?

Reply 37

Original post by lolface32

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

Reply 38