OCR 21st Century GCSE Science - P4 P5 P6 - 16th June 2017

In the cgp revision guide it keeps saying learn the formulas but they do give the formulas at the begginging of the paper don't they?

predictions anyone

As we've seen in this year's additional Chemistry paper yesterday, OCR seem to be simply reproducing questions. For this reason, I'd highly recommend you try as many past papers as possible before tomorrow.

In terms of predictions, however:

P4:
(Almost every six mark question in this module revolves around forces. In particular, we could see:
a question that assesses knowledge of the relationship between KE and GPE;
a question about safety features of modern vehicles - cause and correlation and explanation;
a question about friction - identify overriding/resultant forces (and calculate quantitatively) as well as other forces, such as a reaction force - types of friction(?);
a question targeted at the lower grades, explaining the motion of a car according to a velocity-time graph (i.e. identifying areas in which a vehicle is stationary, accelerating and at a constant speed.)

P5:
a question comparing the similarities and differences between a motor and a generation (as seen before);
a question solely on the theory behind a generator or motor or transformer - perhaps with data analysis;
a question about series circuits or parallel circuits or both (as seen in last year's paper);
a question about electromagnetic induction - explanation of factors and stating its applications: transformers and generators.

P6:
a question about Rutherford's scattering - conclusions with regards to the nature of a nucleus (an atom consists of mostly empty mass; positive and a tiny nucleus located in centre) with explanation;
a question about half-life - which isotope is more practical in a given context - the danger of highly active isotopes;
a question comparing energy production by nuclear fission and nuclear fusion - which is more practical by stating advantages and disadvantages;
a question solely about nuclear power stations that use a process of nuclear fission - incorporation of the key words: chain reaction, control rods, coolant, fuel rods;
a question comparing the three types of ionising radiation: alpha, beta and gamma.

I believe that at least half of the topics cited above have a high chance of coming up for each module.

As we've seen in this year's additional Chemistry paper yesterday, OCR seem to be simply reproducing questions. For this reason, I'd highly recommend you try as many past papers as possible before tomorrow.

In terms of predictions, however:

P4:
(Almost every six mark question in this module revolves around forces. In particular, we could see:
a question that assesses knowledge of the relationship between KE and GPE;
a question about safety features of modern vehicles - cause and correlation and explanation;
a question about friction - identify overriding/resultant forces (and calculate quantitatively) as well as other forces, such as a reaction force - types of friction(?);
a question targeted at the lower grades, explaining the motion of a car according to a velocity-time graph (i.e. identifying areas in which a vehicle is stationary, accelerating and at a constant speed.)

P5:
a question comparing the similarities and differences between a motor and a generation (as seen before);
a question solely on the theory behind a generator or motor or transformer - perhaps with data analysis;
a question about series circuits or parallel circuits or both (as seen in last year's paper);
a question about electromagnetic induction - explanation of factors and stating its applications: transformers and generators.

P6:
a question about Rutherford's scattering - conclusions with regards to the nature of a nucleus (an atom consists of mostly empty mass; positive and a tiny nucleus located in centre) with explanation;
a question about half-life - which isotope is more practical in a given context - the danger of highly active isotopes;
a question comparing energy production by nuclear fission and nuclear fusion - which is more practical by stating advantages and disadvantages;
a question solely about nuclear power stations that use a process of nuclear fission - incorporation of the key words: chain reaction, control rods, coolant, fuel rods;
a question comparing the three types of ionising radiation: alpha, beta and gamma.

I believe that at least half of the topics cited above have a high chance of coming up for each module.

I'd say these are relatively firm predictions, although I find static electricity coming up quite likely. Look at the six marker in the first P456 paper for reference.

Edit: friction is likely to come up. Motor effect is very likely (e.g. what it is and its uses). For P6, I recommend disposing nuclear waste.

I am dreading this exam. I don't have a very good teacher and he only taught us a little bit of P5, so I've had to rely on the revision guide

I am dreading this exam. I don't have a very good teacher and he only taught us a little bit of P5, so I've had to rely on the revision guide

In simple terms could you explain to me what the motor effect is as someone explained earlier on in the thread and it still confuses me

That would be me. I apologise. I will try to explain it more clearly:

The motor effect is where a current-carrying wire experiences a force in a magnetic field. If you imagine a rectangular coil of wire, there are two arms which have current flowing in opposite direction. Therefore, according to Fleming's Left Hand Rule, there will be forces on each arm of the coil in opposite directions, so as to produce anti-clockwise or clockwise motion. The tricky part is when the coil makes a half turn, which if you imagine, the current begins to flow in the opposite direction. Again, according to the rule, this would mean that opposite forces would act and the coil would simply spin back and forth. We therefore use a split-ring commutator which reverses the electrical brushes on each arm of the coil to reverse the change to the direction of the current - meaning that opposite forces continually act on each arm to produce clockwise or anti-clockwise motion. This allows a motor to be useful in appliances such as fridges and washing machines, in tyres of electrical cars and trains or simply in DVD players.

Thanks i sort of get it dw its not your explanation thats bad its just me im not great at physics lol as you can tell and basically have not had a teacher for the past 2 years... also if it just asks what is a motor what would i say.

same omg!! and i'm doing P7

alright i guess. was it two sequences of half life? unofficial mark scheme would be appreciated