Science ks3

6 replies

mrsglowglow · 09/02/2019 11:27

My Son has done a simple graph but stuck on the calculation. Any help appreciated.

OP posts:

BrinkPink · 09/02/2019 11:37

Is the graph a straight line? If so you continue the line onwards and then find where it crosses the 1200 mark and what the strength would be at that point.

Original poster

mrsglowglow · 09/02/2019 14:03

No it isn't a straight line but more of a curve. He missed the lesson so will have to ask the teacher.

OP posts:

cosmicgirl97 · 09/02/2019 14:19

Just check he's plotted the axes correctly (aggregate on x, strength on y) and done a reasonable curve of best fit and continue the curve past 1200 on x axis. No calculation involved, the 'working' would just be using a ruler to pencil from 1200 to the curve then same to the y axis to give the answer.

Original poster

mrsglowglow · 09/02/2019 20:36

Thanks for your help. He was over complicating

OP posts:

DadDadDad · 09/02/2019 21:19

I don't imagine any engineer would be happy at determining the strength of some concrete by extrapolating beyond the known data! Extrapolating is a big no-no in most science (not to say it doesn't happen, and obviously no choice in order to answer this question).

BrinkPink · 09/02/2019 22:40

If he does become an engineer though, the training will probably include not to calculate concrete strength for a bridge by extrapolating a wee graph. (I hope...)

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