its important to have a manipulative variable so you have at least one variable that will reapond to what you do to it
If you change more that one variable in an experiment, then when the result occurs, you won't know which variable caused the change.
What is a variable in a experiment
Controlled Experiment :Pcontrolled experiment.
controlled experiment
Because if you change more than one variable at a time, you can't tell which is affecting the results.
Well in the case that it does have a variable, even just one, it would still be a variable experiment because that one part of the experiment may still cause a different effect/result when changed!!!
It is important to only change one variable at a time when doing an experiment, because if you change more than one, there will be uncertainty as to which one affected the result.
The variable you can't control is presumably the one you want to know. If you know one variable, it could be anything, weight, temperature, mass etc, and you know the result in the experiment, you can work out the missing variable and therefore the result of your experiment.
The independent variable is the one variable that you change in your experiment
The independent variable is the one variable that you change in your experiment
A single-variable experiment, also known as a one-factor experiment, is one in which only one variable is manipulated at a time while keeping all other variables constant. This allows researchers to isolate the effects of that specific variable on the outcome of the experiment.
The variable you can't control is presumably the one you want to know. If you know one variable, it could be anything, weight, temperature, mass etc, and you know the result in the experiment, you can work out the missing variable and therefore the result of your experiment.