Current Year 11 thread mark III (woo!) / Year 12 2012/13
Discussion for GCSE students, including those studying for IGCSEs and O Levels.
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Re: Current Year 11 thread mark III (woo!) / Year 12 2012/13Right everyone here goes. It was sooo hard. So this is the answers i can remmeber and the questions i think it was.
UPDATED
I think these are in the right order
1a) Towards the centre of the circle (1)
1b) Tension in the rope (1)
1c) Because changing one of these would affect the centripetal force and the speed of the bung and they did it so that there was only one independent variable. For example, if the mass of the bung increased, the centripetal force needed to keep it moving at the same speed would need to be increased (2)
1d) So that their results were more reliable (1)
1e) continous, dependent(1)
1f) The bigger the centripetal force, the faster the speed needed to keep it moving in a circle (1)
2a) They suspended the card from a pole (the pole went through the hole) and the card came to rest with it's centre of mass directly below its point of suspension. It did this as its weight had had a turning effect that returned it to its equilibrium position. Then they drew a line vertically down using a plumbline. Then, the repeated the proccess from a different point on the card and drew another vertical line down when the object came to rest and the place where the lines meet is the centre of mass (3)
2b) they could test that the position is accurate by balancing the point where the lines cross on a pointed object like a sharp pencil. If the centre of mass is in the correct position it will balance, if it isn't, it won't (2)
3a) gravitational attraction between the satellite and the earth (1)
3b) No, because geostationary satellites orbit the earth once every 24 hours not twice every 24 hours. (2)
4a) This happens because of the motor effect. The wire moves upwards when the switch is closed because current flows through the circuit and a magentic field forms around the wire and this interacts with the magnetic field from the magnet and repulses it so it moves upwards (2)
4b) The motor effect (1)
4c) The wires direction of movement would be reversed five times every second (2)
4d) I cant remember this question but it was something to do with increasing the frequency. So here goes: The wire would move back and forth quicker and further (2)
4e)0.005 N (2)
5a) The maximum loudness of the notes are the same as they have the same mixmum amplitude (1)
5b) The first notes is a smooth sound whereas the second notes is a sharp, brassy sound (1)
5c) The amplitude (1)
5d) Because they can only hear sound including and above 48 decibels so they need people to talk louder than in a normal conversation because the normal conversation is 45 decibels (2)
5e) Crosses across twenty from 250-20000 Hz (1)
5f) Because it can damage their hearing (1)
5g)Because in the hall the sound will reflect of the walls meaning that the sound is louder (1)
6a) step up (1)
6b) because there are more turns on the secondary coil than on the primary coil (1)
6c)because it is a magnetic material (1)
6d) 60 turns (2)
7a) diverging lens (1)
7b) line from object through centre of lens. line focus thorugh the point where a line from the top of the object meets the vertical y axis. Arrow where they meet (3)
7c) 0.5 (2)
7d) because the image is formed on the same side of the lens as the object (1)
8a) the star runs out of hydrogen to fuse together in its core (1)
8b) The star expand, becomes hotter and then cools to form a red giant. It then contracts and cools even more to form a white dwarf. (3)
I think i got 32/45 i think i dropped 13
Here is what i think i dropped
1c) Because changing one of these would affect the centripetal force and the speed of the bung and they did it so that there was only one independent variable. For example, if the mass of the bung increased, the centripetal force needed to keep it moving at the same speed would need to be increased (2)- Lose 2
2a) They suspended the card from a pole (the pole went through the hole) and the card came to rest with it's centre of mass directly below its point of suspension. It did this as its weight had had a turning effect that returned it to its equilibrium position. Then they drew a line vertically down using a plumbline. Then, the repeated the proccess from a different point on the card and drew another vertical line down when the object came to rest and the place where the lines meet is the centre of mass (3)-Lose 1
4a) This happens because of the motor effect. The wire moves upwards when the switch is closed because current flows through the circuit and a magentic field forms around the wire and this interacts with the magnetic field from the magnet and repulses it so it moves upwards (2)-Lose 1
4c) The wires direction of movement would be reversed five times every second (2)-Lose 2
5b) The first notes is a smooth sound whereas the second notes is a sharp, brassy sound (1)-Lose 1
5d) Because they can only hear sound including and above 48 decibels so they need people to talk louder than in a normal conversation because the normal conversation is 45 decibels (2)-Lose 2
5e) Crosses across twenty from 250-20000 Hz (1)Lose 1
5f) Because it can damage their hearing (1)-Lose 1
8b) The star expand, becomes hotter and then cools to form a red giant. It then contracts and cools even more to form a white dwarf. (3)-Lose 2
PLEASE MARK THIS AND LET ME KNOW HOW YOU THINK I'VE DONE, WHERE YOU THINK I HAVE DROPPED MARKS OR GAINED MARKS AND WHY BECAUSE I DID SPEND THE TIME TO COME UP WITH THE MARK SCHEME -
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Re: Current Year 11 thread mark III (woo!) / Year 12 2012/13Oh awesome, how're you feeling about it?(Original post by mjordanjnr)
I am too -
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Re: Current Year 11 thread mark III (woo!) / Year 12 2012/13Need some advice:
I plan to do bio and chem in A-levels how ever my results are like this (just 4 science)
Core science:- A by the end of the year
Additional Science:- C maybe a B (that is if i got an A in my resit which i highly doubt)
My dream 6th form asks for BB what do i do? Should i sent them an email or call them up or ask my brother to convice me to get on the course? -
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Re: Current Year 11 thread mark III (woo!) / Year 12 2012/13Call them up because a C if you want to continue any science at A-level is bit risky and most 6th form do not allow it at all... My sister got an A and a B and she was not allowed to take physics or chemistry just biology because it is "supposedly" the easiest. But I'm sure if you call them up and ask them, they will tell you what they think. It really depends on the school.(Original post by lil-mazie)
Need some advice:
I plan to do bio and chem in A-levels how ever my results are like this (just 4 science)
Core science:- A by the end of the year
Additional Science:- C maybe a B (that is if i got an A in my resit which i highly doubt)
My dream 6th form asks for BB what do i do? Should i sent them an email or call them up or ask my brother to convice me to get on the course? -
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Re: Current Year 11 thread mark III (woo!) / Year 12 2012/13Thanks i'll try(Original post by applesdonothelp)
Call them up because a C if you want to continue any science at A-level is bit risky and most 6th form do not allow it at all... My sister got an A and a B and she was not allowed to take physics or chemistry just biology because it is "supposedly" the easiest. But I'm sure if you call them up and ask them, they will tell you what they think. It really depends on the school.
I'm worried though
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Re: Current Year 11 thread mark III (woo!) / Year 12 2012/13surprisingly good(Original post by shyamshah)
P2 was a lot better than i expected, how did everyone find it?
my hardest was chem..
I'm worried though
Good Luck with that 
Yup. The last question was meant to be easy, but the wormy-looking graph stumped me until i got into gear!
