how to graph for ty or lc ol
TRANSCRIPT
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How to Graph Data
TY and LC OL Physics
Copyright Dee Magui re
CBS,
Kilkenny
For non-commercial purposesonly.. Enjoy!
Comments/suggestions please to the SLSS physics website forum
@
http://physics.slss.ie/forum
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Graphing data
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Does yourgraph looklike thisone?
F
a
1.0 2.0 3.0 4.0 5.0 6.0 7.0
36.4
31.0
26.0
21.0
15.8
10.2
5.2
0
There areseveral
majorerrors inthis graph.
How manycan you
spot?
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So, it may not be as simple as graphingthe exact data that is in the examquestion
..but there are a number ofguidelines to help you.
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Lets have another quick look at thequestion
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Now you are ready to draw the graphThere are a few easy things you can dostraight away:
(i) Ask for graph paper (deducted
marks otherwise!)(ii) Title the graph
(iii) Decide what data will go on each
axis
(iv) Title the axes (include units)
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Graphing data
(i) Ask for graph paper (marks deducted
otherwise!)
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Graphing data
(ii) Title the graph
You can find a very suitable one in the question
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Graphing data
(iii) Decide what data will go on each axisAs a rule, their top line is your bottom line
So, F will go on the x axis. Dont forget
the units!
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To verify Newtons second Law
F/N
So farthegraph
looks likethis..ongraphpaper..
naturally!
Since F ison the xaxis, lets
put a on theyaxis.dontforget
units!
a /cm s-2
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Graphing data
The next stage is VERY IMPORTANTLets have another look at the data wenow want to plot.start with F
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Graphing data
The values for F go from 1.0 up to 7.0...so that is straightforward enough
Use as much of your graph sheet as possible
but make sure you go at least as far as8.0ideally upto 10.0
You must make equal sized intervals along your x axis
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To verify Newtons second Law
F/N
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
a /cm s-2
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Now decide on how your y axis will be divided.
The values for a go from 5.2 to 36.4..but you MUST
start at zero
You must go AT LEAST AS FAR as 36.4. Try to useas much of the page as possible, using EQUAL sizeddivisions
Do NOT write the above readings on yr graph!!!!!!!!!
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To verify Newtons second Law
F/N
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
45
40
35
30
25
20
15
10
5
a /cm s-2
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You must NEVER..join-the-dots!
Always pick a best-fit line. If thedots dont form an EXACT straight line,make sure there is the same number of
dots on each side of the line
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To verify Newtons second Law
F/N
a /cm s-2
0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
45
40
35
30
25
20
15
10
5
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In summary. Do it on graph paper
Title the graph and the axesInclude units on the axes
Divide your axes correctly
And finally..
Plot your points
Their top line is your bottom line
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If you make a mistake on yourdivision of axes etc, it is oftenquicker and neater to start again
.Ask for more graph paper