SharDee
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I've got my real ISA's soon, and 100% confused with the method.

This is my hypothesis: The strength of a polymer strip depends on the width of the polymer strip

We're going to do an experiment where you hand plastic bag strips of same length by different widths on a stamp stand and weigh different mesures until it breaks to test the hypothesis.

But..I'm confused with the method, I have no idea how I should start it, what the first step would be and specific detail!!

Please help me, thanks in advance ( need asap)
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abbysears
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Testing plastic bag (polymer) strength



This experiment will let you compare the strength of carrier bags provided by different retailers.

Equipment

Plastic bags from different supermarkets
Masses
Two tables
Four G clamps
Four wooden battens
Ruler
Scissors

Method

Cut a 30cm square from the plastic bag.
Place one edge between two wooden battens and clamp to the edge of one table firmly with two of the clamps.
Repeat with the opposite edge and clamp to the other table.
Measure how far the tables are apart and make sure this is the same for each test.
Add masses 100g at a time to the centre of the plastic sheet until it breaks and record the mass used.
Repeat for each plastic bag from the different supermarkets.

Risks

Be careful to stand well back when adding masses as the plastic may break unexpectedly and the masses could fall on your feet. Also make sure you are using heavy enough tables that will not be pulled over by the mass in between them.

source; http://www.gcsesciencemethods.co.uk/...-strength.html
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rebekah14
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thanks that was a save for me so thanks
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josie2014
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hi ,

can you help me visualise this experiement, we've been assigned to write about it yet we have not physically done it and wont till September now. Any one got any good links inlcuding videos ? Many thanks
Happy summer holidays to all..
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Speedscarlet
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Thanks a bunch
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Speedscarlet
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Could someone write about the context- relating the investigation to the context part for this experiment
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Dwellcut
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@shardee. Could u tell me the independent,dependent and control variable for this please asap!

Please could u give the answer! ASAP!!
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SharDee
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(Original post by Dwellcut)
@shardee. Could u tell me the independent,dependent and control variable for this please asap!

Please could u give the answer! ASAP!!
I've completed this isa a while back now ( did it in year 10, now I'm in year 11) , so I've completely forgotten, but I'll give it a try:

Independent variable (what you'll be changing) is: the width of the polymer strip.

Dependent ( what you will be measuring) is: The amount of weight (kg) it takes to break the polymer strip

Controlled variables ( what you will keep the same):Basically everything else, e.g the material of the polymer strip
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Dwellcut
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@shardee. Thank you very muchh!! (: You made my day 😀
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samcole123
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can some one help me with the secition 2 paper for this isa, what should i revise??
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me a bean
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thnks helped a load
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me a bean
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thanks 4 the help im a bean
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me a bean
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I am a bean
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me a bean
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did you know im a bean
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me a bean
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ima bean
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me a bean
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bean
(Original post by me a bean)
did you know im a bean
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titration
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Lols at isas they make your life hell
Experience: been and done it never have to do another in my life
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me a bean
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(Original post by titration)
Lols at isas they make your life hell
Experience: been and done it never have to do another in my life
uim a vbzvean
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Orlamcg607
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are you stupid, think about it. You are at GCSE level you can visualise something, it is not hard!
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cock slapper
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hi
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