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# AQA GCSE Physics Unit 2 and 3 (20th May) watch

1. (Original post by Hollie1903)
What does everyone think the 6 marker will be?
My physics teacher thinks it could be either the life cycle of stars or how alternating currents work in a transformer (magnetic field, iron core etc)
2. (Original post by gennabm)
My physics teacher thinks it could be either the life cycle of stars or how alternating currents work in a transformer (magnetic field, iron core etc)
Wasn't it transformers last year though? With how he biology and chemistry unit 3 was I think it will be another advantages and disadvantages (e.g. Of switch mode transformers or something). Either it will be quite easy like biology and chemistry or it will be rock hard :/
3. (Original post by maary)
same I find physics so hard and yes omg the 3 ones have been a lot easier so far esp for bio!!
god nooo I hate transformers
My teacher thinks the same will come up but I've been told (haven't looked) that transformers came up last year?
The chem and bio ones have been quite nice so i'm hoping this will be similar!
4. I'm really freaking out about physics, I hope that there isnt much electricity because I find that difficult I want there to be lots of calculations because that requires less understanding haha
5. (Original post by gennabm)
My teacher thinks the same will come up but I've been told (haven't looked) that transformers came up last year?
The chem and bio ones have been quite nice so i'm hoping this will be similar!
yeh i think it may have done - can't remember ahah same but i find phys harder esp p2 and 3 so no hope for meee!!
6. (Original post by Katie64)
Thank you, but videos to me aren't the best way to learn. Any tips on what you know?
velocity-time graphs

- Remember , velocity is speed in a given direction

- a = (v-u)/t
[acceleration = (final velocity - initial velocity)/time]

- the gradient represents acceleration. if the gradient is negative , therefore the object is decelerating.

- if the gradient is 0 , the object is moving at constant velocity.

- the area under the graph represents the distance travelled by an object [HT]

distance-time graphs

- speed = distance / time

- constant speed will be shown as a straight line on a distance-time graph

- the gradient of the graph represents speed.
the steeper the line means a greater distance traveled in a short time , meaning it is travelling a fast speed.

- If the gradient is 0 , the object is not moving (stationary)

THE LIFE CYCLE OF A STAR

- Gas and dust in space are pulled together by gravitational attraction , forming a protostar

- the protostar becomes more dense and hotter from other small masses , causing nuclear fusion to occur between hydrogen nuclei making an explosion occur which is equal to the force of gravittational attraction

- The main sequence is when stars start to emit light energy and heat energy.
the energy after the main sequence , runs out of hydrgen nuclei to fuse meaning no more energy.

- After the main sequence ,

Stars the same mass as the sun or smaller :
- cool down , and turn red. this is called a red giant
- the red giantbreaks its shell to form a white dwarf
- then they run out of energy completely and turn into black dwarfs

these stars form elements lighter than iron but heavier elements than helium

Stars bigger than the sun :
- become red supergiant
- the star gets more compressed , causing an explosion known as the supernova

After the supernova ,

it could become a neutron star which is extremely dense and only made of neutrons

IF THE STAR IS MASSIVE , it becomes a black hole instead.

the supernova form elements heavier than iron
Attached Images

7. Can someone please explain how an inverted, real, diminished imaged is produced in a camera

Thanks
8. (Original post by Kieran3)
I think it'll probably be on the life cycle of stars

Anyway, what do we need to revise?!
I think that's what it was on last year
9. (Original post by PawanAviator)
velocity-time graphs

- Remember , velocity is speed in a given direction

- a = (v-u)/t
[acceleration = (final velocity - initial velocity)/time]

- the gradient represents acceleration. if the gradient is negative , therefore the object is decelerating.

- if the gradient is 0 , the object is moving at constant velocity.

- the area under the graph represents the distance travelled by an object [HT]

distance-time graphs

- speed = distance / time

- constant speed will be shown as a straight line on a distance-time graph

- the gradient of the graph represents speed.
the steeper the line means a greater distance traveled in a short time , meaning it is travelling a fast speed.

- If the gradient is 0 , the object is not moving (stationary)

THE LIFE CYCLE OF A STAR

- Gas and dust in space are pulled together by gravitational attraction , forming a protostar

- the protostar becomes more dense and hotter from other small masses , causing nuclear fusion to occur between hydrogen nuclei making an explosion occur which is equal to the force of gravittational attraction

- The main sequence is when stars start to emit light energy and heat energy.
the energy after the main sequence , runs out of hydrgen nuclei to fuse meaning no more energy.

- After the main sequence ,

Stars the same mass as the sun or smaller :
- cool down , and turn red. this is called a red giant
- the red giantbreaks its shell to form a white dwarf
- then they run out of energy completely and turn into black dwarfs

these stars form elements lighter than iron but heavier elements than helium

Stars bigger than the sun :
- become red supergiant
- the star gets more compressed , causing an explosion known as the supernova

After the supernova ,

it could become a neutron star which is extremely dense and only made of neutrons

IF THE STAR IS MASSIVE , it becomes a black hole instead.

the supernova form elements heavier than iron

Thank you! This is really helpful!
10. (Original post by Katie64)
Thank you! This is really helpful!
thats alright
11. ****ting myself but i hope there's a lot of calculations
12. (Original post by PawanAviator)
velocity-time graphs

- Remember , velocity is speed in a given direction

- a = (v-u)/t
[acceleration = (final velocity - initial velocity)/time]

- the gradient represents acceleration. if the gradient is negative , therefore the object is decelerating.

- if the gradient is 0 , the object is moving at constant velocity.

- the area under the graph represents the distance travelled by an object [HT]

distance-time graphs

- speed = distance / time

- constant speed will be shown as a straight line on a distance-time graph

- the gradient of the graph represents speed.
the steeper the line means a greater distance traveled in a short time , meaning it is travelling a fast speed.

- If the gradient is 0 , the object is not moving (stationary)

THE LIFE CYCLE OF A STAR

- Gas and dust in space are pulled together by gravitational attraction , forming a protostar

- the protostar becomes more dense and hotter from other small masses , causing nuclear fusion to occur between hydrogen nuclei making an explosion occur which is equal to the force of gravittational attraction

- The main sequence is when stars start to emit light energy and heat energy.
the energy after the main sequence , runs out of hydrgen nuclei to fuse meaning no more energy.

- After the main sequence ,

Stars the same mass as the sun or smaller :
- cool down , and turn red. this is called a red giant
- the red giantbreaks its shell to form a white dwarf
- then they run out of energy completely and turn into black dwarfs

these stars form elements lighter than iron but heavier elements than helium

Stars bigger than the sun :
- become red supergiant
- the star gets more compressed , causing an explosion known as the supernova

After the supernova ,

it could become a neutron star which is extremely dense and only made of neutrons

IF THE STAR IS MASSIVE , it becomes a black hole instead.

the supernova form elements heavier than iron
Thank you so so much for this!
13. (Original post by harryleavey)
Pm me 😀
Please send it to me aswell! do you have p3
14. (Original post by DrNippleson)
Last year's six mark was a transformer, yeah.

I'm personally hoping for lots of calculations and the six marks being Fission/Fusion or Star Cycle (p2) and Lenses/Eye/Medical Equipment for P3.
I would be so happy if these topics come up!
15. Can someone explain what is a neutral wire for and what does OV mean thanks

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16. what would you need to say about nuclear fusion and fission, if it were the 6mark question?
17. Good luck everyone!
Remember the comparisons between the eye and the camera - could be a potential six marker too!

Camera:
- Converging lens with a fixed focus
- Brightness controlled by diaphragm and aperture
- Focus achieved by varying lens position
- image formed on CCD/film

Eye:
- Converging lens with a variable focus
- Brightness controlled by pupil and iris
- Focus achieved by ciliary muscle contractions
- image formed on retina

Image made by both of them is Real, Inverted and Diminished (just remember RID)

Potential 4-6 marker could be how is an ultrasound image formed:

- Ultrasound waves are partially reflected when they reach different media
- Time taken for reflected waves to reach detector is measured
- Each boundary distance is measured
- Image is formed

Potential 4- 6marker could be how a smoke alarm works

- Uses Alpha
- Long Half life
- Ionises the air
- Which allows a current to flow
- Smoke absorbs particles
- Which triggers the alarm

Just some extra little facts:
- Principle Focus is the point where the Rays meet
- Focal length is he distance between the lens on principle focus
- The focal length depends on the refractive index of the material of a lens and the curvature of the lens.
- If in doubt on a graph question requiring a calculation, do the vertical line divide horizontal line
- Remember the circuit symbols and the graphs for LDRs, Thermistors, Lamp, Diode and thermistor.
18. (Original post by harryleavey)
Hi

Here is a MyGcseScience video describing Nuclear Decay Equations.
https://goo.gl/xeWF0V

hi - sorry but is there any way you could also post one for transformers and the whole electromagnets thing and earthing? because I tried to go on but its trying to charge me???
19. Guys, do we need to know about shuttle re-entry or meteorites burning up the atmosphere?! I don't know ANYTHING about this.
20. (Original post by angellll)
Guys, do we need to know about shuttle re-entry or meteorites burning up the atmosphere?! I don't know ANYTHING about this.
No we don't

Here is the specification:

http://filestore.aqa.org.uk/subjects...YS-W-SP-14.PDF

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