Prac F & A
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Prac F & A

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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 & A Prac F & A Presentation 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:
      • Do they achieve your aim, prove your hypothesis (if you had one).
      • 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.