P3 Ex

Topics: Mark, Friction, General Certificate of Secondary Education Pages: 42 (6333 words) Published: April 17, 2013
Controlled Assessment – Additional Science / Physics ISA PU2.x Friction (Specimen)
For use from May 20xx to April 20xx
Teachers’ Notes
This ISA relates to Additional Science / Physics Unit 2: P2.1.3 Forces and braking A vehicle’s braking distance can be affected by adverse road and weather conditions and poor condition of the vehicle

Candidates should:
• develop hypotheses and plan practical ways to test them
• make risk assessments and manage risks when carrying out practical work • collect, process, analyse and interpret primary and secondary data, including the use of appropriate technology to draw evidence-based conclusions

• review methodology to assess fitness for purpose, and review predictions in light of outcomes. The teacher should describe the context in which the investigation is set and outline the problem that is to be investigated.

Candidates need to develop their own hypothesis. They should research two possible methods to investigate it, and develop a detailed plan for one of these methods. Once the candidates have researched and written up their own plan in the first part of the ISA they should carry out their investigation providing that it is workable, safe and manageable in the laboratory.

Candidates then take Section 1 of the ISA, which contains questions about their research and their plan.
Candidates then carry out experimental work and process their results. After this, candidates take Section 2 of the ISA, in which they analyse their results and use data selected from a data sheet of secondary data to comment on the outcomes of their experimental work.

Risk Assessment
It is the responsibility of the centre to ensure that a risk assessment is carried out.

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Stage 1 – Planning research (Limited control)
Candidates should be given the opportunity to carry out an investigation concerning friction. This should be set in a context by the centre. Examples of suitable contexts could include, eg the design of car tyres or road surfaces. Whichever context is chosen, the teacher must take care to present it in such a way that it does not limit the candidates' choice of method for the investigation. Candidates should then independently research an appropriate plan and decide for themselves factors such as the range, interval and number of repeat readings that they should take, and the variables that need to be controlled.

They will need to undertake independent research to identify two different methods that could be used. During this time they may make one A4 side of their own research notes for use during Section 1 of the ISA. The sheet for making these notes is attached. Candidates may use technology such as the Internet or CD-ROMs, textbooks or any other appropriate sources of information for their research.

Candidates should also research the context of this investigation to find out how the results of their experiment might be useful in the specified context.
There is no set time allocation for this research, but it is anticipated that it should take no longer than 3 hours of work. This research may be done in the laboratory or elsewhere. The teacher should check and sign these notes before allowing the candidate to use them during the completion of Section 1 of the ISA. The candidate may use these notes while completing Section 1 and Section 2 of the ISA. When the candidate has completed Section 2, the notes should be stapled to the ISA.

Stage 2 – Reporting on the planning research (High control) For this stage, candidates must work individually under direct supervision. After candidates have completed their research they should be given Section 1 of the ISA and should work on their own, under controlled conditions,...
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