Suppose you would like to find out which brand of glue holds better. What variables would you need to control in your experiment?What variables would you need to control your experiment?
1] All variables relating to the surfaces being joined; cleanliness, roughness, material, moisture content, cure time and temp, humidity,
etc
2] amount of glue used to join
3] All variables relating to the measuring of the force required to separate the surfaces; how they are separated [straight pull, peeled, etc], how fast they are pulled/peeled, temperature of test, humidity
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