GCSE OCR 21st Century Triple Science (CBP1-7) Thread

Filament -> High resistance -> Electrons colliding with positive charges -> Heat generated -> Begins to glow -> Visible light emitted

Vice versa for connecting wires I believe

Yeah I realise that now haha

Reply 1501

sleepylion

Let me just go cry in a corner please... :frown:

Reply 1502

-sophia-

9

What happened in the question where they added a battery in parallel?

Reply 1503

romaiseb

8

Original post by ColeNate

I didn't mention KE and GPE because I wasn't confident enough on it in the context of long jumping to be honest. I mentioned friction between his feet and the floor, the resultant force generated forwards, how momentum increases with force and other factors which could have slowed him down such as air resistance and disabilities.

I was exactly the same - I didn't mention any thing about K.E + G.P.E - I also wrote the same thing as you about driving forces, friction, backward and forward forces + counter forces - we should be in the 4 mark boundary - maybe 5 for that question :smile:

Reply 1504

Basim97

How do everyone find it

Reply 1505

viddy9

16

Original post by TomSmith98

I got 0.00000003 recurring. Mass = Energy / Speed of light squared. The number sounds reasonable because nuclear fission is much more efficient than burning coal. Can anyone clarify :confused:

Yes, that is correct, I believe: it only takes an extremely small mass of uranium to give out a lot of energy.

As for the filament question, the filament wire is thinner, giving it more resistance as the free electrons collide with the fixed lattice of ions in the filament more regularly, transferring more kinetic energy (heat) which then transfers to light energy. Opposite for the connecting wire.

Adding a resistor in parallel, meanwhile, decreases the total resistance of the circuit.

(edited 9 years ago)

Reply 1506

sleepylion

I think I may have literally spent about 7 hours trying to teach myself all the electricky stuff in P6 yesterday and was quite confident before the exam today.....
.....But I fumbled it when it came down to the wire...... :wink:

Reply 1507

Amyjonesx

2

I thought the exam was neither hard or easy. I think ive made a lot of silly mistakes! What did everyone get for the change in momentum question? I guessed and put 0.4:s
and for the usain bolt question was it 8.7 or 9.7? I ended up putting 9.7

Reply 1508

ColeNate

7

Original post by Amyjonesx

I thought the exam was neither hard or easy. I think ive made a lot of silly mistakes! What did everyone get for the change in momentum question? I guessed and put 0.4:s
and for the usain bolt question was it 8.7 or 9.7? I ended up putting 9.7

My money's on 9.7. On Wikipedia it says that his record was actually 9.58 seconds but that's close enough for the mark.

Reply 1509

lyricalvibe

16

Original post by Amyjonesx

I thought the exam was neither hard or easy. I think ive made a lot of silly mistakes! What did everyone get for the change in momentum question? I guessed and put 0.4:s
and for the usain bolt question was it 8.7 or 9.7? I ended up putting 9.7

Same with the hardness of the questions :smile:

, I didn't find the test easy, I found it quite fair but still had a struggle with time and it did seem hard at parts but I was expecting a lot worse :biggrin:

I don't remember I remember putting 2.4 for one but I don't think it's the same question :/

I got 9.7

Reply 1510

akl141

Original post by -sophia-

What happened in the question where they added a battery in parallel?

The voltage remains the same and so does the current. Voltage is always constant in a parallel circuit and the current ACROSS each branch will also be the same as if it were the only one present.

Reply 1511

ColeNate

7

Original post by akl141

The voltage remains the same and so does the current. Voltage is always constant in a parallel circuit and the current ACROSS each branch will also be the same as if it were the only one present.

Ah, bugger then. I put they both increase. :frown:

Reply 1512

-sophia-

9

Original post by akl141

The voltage remains the same and so does the current. Voltage is always constant in a parallel circuit and the current ACROSS each branch will also be the same as if it were the only one present.

Ah i put voltage increase and current stays the same :/

Reply 1513

akl141

The other question, which combination of 100 Ohm and 200 Ohm resistors had the lowest total resistance, the answer was two 100 Ohm resistors in parallel because the resistance halves as there are more pathways for the charge to go through.

Reply 1514

Jillianmckeith

5

What do you think the grade boundaries will be like? It was 34 for an a* last year

Reply 1515

romaiseb

8

Original post by akl141

The other question, which combination of 100 Ohm and 200 Ohm resistors had the lowest total resistance, the answer was two 100 Ohm resistors in parallel because the resistance halves as there are more pathways for the charge to go through.

Yep that's the one I chose :smile:

Reply 1516

username1344042

6

It was awful omfg

Posted from TSR Mobile

Reply 1517

Elizajayne

Original post by Jillianmckeith

I didn't know that filaments are resistors! I started talking about how the filament is thinner so the charge has to squeeze through it more incomparison the the thicker wires connected to the filament which would've heated it up more haha

same thats what i talked about didn't know they were resistors either ! :angry:

Reply 1518

viddy9

16

I'm guessing the grade boundaries will be around 36 or 37 for an A* this year, based on what I've heard from other people.

Reply 1519

bankruptline

5

I made some really stupid mistakes and I'm a bit worried about it.

I wrote down what to put in the calculator for the 3.0 X10^9/(3.0X10^8)^2

But then I forgot to square the bottom one!!! So mad at myself for that.

Anyway what did anyone put for the Usain Bolt one for at what point was he accelerating the most at?

GCSE OCR 21st Century Triple Science (CBP1-7) Thread

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