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Prac F & A

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Information about Prac F & A
Education

Published on May 14, 2010

Author: kwarne

Source: slideshare.net

Description

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

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?

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.

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.

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