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# Prac F & A

## on May 14, 2010

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A set of slides created to teach Prac F & A to learners at Bishops Diocesan College in Cape Town.

A set of slides created to teach Prac F & A to learners at Bishops Diocesan College in Cape Town.

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## Prac F & APresentation Transcript

• Relationship Between F & a BHS Physical Science K Warne
• F & a Results 2.62 1.3 130 2.52 1 100 2.13 0.7 70 1.35 0.5 50 1.06 0.3 30 a/ms -2 Force/N Mass/g
• Evaluation
• Method - State what worked well - what the problems were and how they were over come. Suggest how things could be changed in order to make the method work better.
• Results - Look critically at your results:
• Are all the results accurate? Identify those which are not and exclude them. Offer reasons for erroneous results. How could they have been avoided.
• Conclusion - can anything be drawn from your results - is this supported by graphs or other ways of displaying your findings?
• Further investigation - can you suggest what other related issues could now be investigated?
• Evaluation
• Method
• - Friction compensation - the systematic error could have been caused by overcompensation for friction. This would have caused a systematic error in keeping with our results.
• Results - Look critically at your results:
• Last one in not in keeping with the others - has been ignored.
• Conclusion - If the line is adjusted for the systematic error then it shows a direct proportionality through the origin.
• Further investigation - can you suggest what other related issues could now be investigated?
• F & a graph Systematic error
• F & a conclusion
• There seems to be a direct proportionality between F and a.
• One result at least seems anomalous to the others. (Indicated on graph) This needs to be checked.
• The graph does not go through the origin - which we would have expected as zero force should produce zero acceleration.
• If the slope of the line is kept constant but the line lowered so that it does pass through (0,0) it could suggest a systematic error in all the results which has caused them to be consistently out by the same amount.