What is the control in an experiment?
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It's the part that shows what happens under normal circumstance, without your variables.  For instance, if you are trying to see what brand of fertilizer works best on tomato plants, you would have one tomato plant that you don't use any fertilizer on so you can see how big it gets with no help and compare that to all the plants that were on fertilizer.
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Test the Hypothesis\nThis is the part where the experimenter actually completes hands-on tests to either prove or disprove the hypothesis. To truly test the hypothesis, the experimenter must compare the results of the experimental group compared to a control group where the variables have not been changed. Example: For two weeks, a group of people eat a certain amount of chocolate each day and another group eats no chocolate.
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An independent variable is the variable that does not depend on anything, like time.  \n\nThe dependent variable depends on the independent variable.\n\nHere is an example... You want to measure how irritated you get from being around your little brother as a function of time.  Time passes, regardless or your irritability.  But the more time passes, your irritability changes.  So your irritability is dependent on the independent factor of time.\n\nThe control is something that you use to measure experimental values by.  Suppose you are not sure that it is your brother making you irritable... maybe you just become irritable because you are part of the experiment.  So, one day, we measure your irritability as a function of time without your brother.  This is the control.  That way when we measure your irritability with your brother around, we can see how these two differed.\n\nFinally, the constant is something that doesn't change.  Maybe your brother is twice as irritable as your sister.  In this case, irritability is being multiplied by a constant.  Maybe ritalin makes your brother less iritable by a constant amount.  Maybe simply being in the room with your brother, even while he is sleeping, increases your irritability by a certain, constant, amount.
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Follow the link for some behaviors shown to increase tips in controlled experiments. They include introducing yourself, smiling, getting the customers to order more, and other techniques.
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An Input Variable is something which you put into an experiment - so say a certain amount of chemical you put in being changed.\n\nThe Output Variable is the results you get, which will obviously change.\n\nTom Walvin\nBiology/Chemistry Student
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Experiment w/ what works for you.
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remember that variables are something that you can change. Your independent variable or manipulated variable is what remains consistent. Your dependent variable is something that you can change throughout the experiment or project. For example if you're doing an experiment plants in which you see if light affects it; the independent variable is the plant. Your dependent variable is what you change or in this case if you put a lamp in the sun and one in the shade. That would be your dependent variable...at least that's what I remembe from science. I might have it backwards...i'm not sure
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Only allowing for one variable in an experiment.
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No... short answer, but it can be controlled.
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I'm guessing the project needs to be an experiment and not just a demonstration.\n\nWhat area of science are you expected to work in? Are you allowed to use live subjects? \n\nPhysics:\nHow does the length of a string affect the period of a pendulum?\nHow does the density of a material affect the speed of sound?\n\nBiology:\nHow does the color of a light affect the growth of a plant?\nHow does caffeine affect a rat's ability to learn?\n\nAnother thing you might do is Google science projects or go to the library and look for a book.
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you could do something like, the effects of pollutants on soil, then to show your experiment try growing plants in different types of soil, have one with normal soil, your control, then others with different pollutants, oil, chemicals, garbage\nHopefully this could help
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In transfer function analysis of a typical closed loop control system, the transducer (sensor) is modeled as the block that is on the feedback path.  This block measures and sometimes modifies the output signal and sends the signal back to be compared with the reference signal.
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Since no-one else has answered the question yet, I'll take a stab at it -\n\nI think the term you're looking for is Hysteresis
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The "variables" are the things in the experiment you are testing.  If you wanted to see if the rate of polar bear births increased when the sale of ice cream increased in Georgia (btw, it does), then the variables would be polar bear births and ice cream sales in Georgia.\n\nYou should note that just because the values of your variables change, does not mean that a cause and effect relationship exists.  As in the example above, just because more polar bears are born in years where ice cream sales in Georgia are high, does not mean that Georgia can make polar bears have more babies just by buying more ice cream.
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Experiment life is short.
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often it refers to the controllable factors. It could mean that other possible influences on the research have been accounted for.
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You can either look it up or determine it experimentally.\nI cant get much more specific without additional details.