# can anyone give me a good science fair topic that uses dvs, ivs, and constants? Can u also make it complex.

what are good science experiments for my grade
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Commented:
Well of course quantitative experiments in every field of study will involve independent and dependent variables.

A few things that I have tried myself or recommended to others:
1. Regular six-sided dice should be fair.  If you get several dice of different colors, you can try modifying some of them.  Try drilling holes partway through each of the dots on one side.  If you have four dice, leave two alone and drill holes on the 2-side of one and the 5-side of another. Roll them 100 times and tabulate the results.  The number of holes (and the depth of the holes if you can keep track of it) are the independent variables.  The number of times each value appears in the table is dependent variable.  The unmodified dice are the control.  The modifications are easy if you have a small drill press, or know someone who does.  If you start with shallow holes, you can run several rounds of tests, making the holes deeper each time.  Be sure to keep really good records of your data.
2. You can see how the shape of a piece of ice affects its melting time.  You can make a spherical ice cube with a balloon.  You can make other shapes with cardboard forms lined with plastic wrap.  Cylinders, disks, and cubes are all good candidates.  If you have a kitchen scale or know someone who does, you can make all the shapes the same weight.  Then put them on a cookie rack and watch them melt.  Maybe you can take a time-lapse video with your phone. make sure to put a clock in the picture. If they start out with the same weight, the independent variable would be the surface area.  The dependent variable would be the melting time.
3. You can try making bridges and beams out of balsa wood or pasta (straight egg noodles) and see which shape is the strongest.  Make as many shapes as you can think of: flat, on edge, ladders and lattices, square tubes and T's.  Load them carefully with weights until they break. A little bag of coins or nails would work.  The independent variables would be the length and weight and construction of the beam.  The dependent variables would be the breaking weight.  Tabulate all your results and take videos of the tests.
4. But the best science fair topics will be things that you actually care about and come up with on you own.  If you have any ideas let us know and we might be able to help.
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Commented:
What do dvs and ivs mean?  What grade are you in?
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Commented:
Psychology  https://www.simplypsychology.org/variables.html

You'll find DVS and IVS there.
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Commented:
I would have two groups of students pushing buttons when they think a person behind the curtain is lying. The faster they push the button, the louder the curtain person screams. In one group, you tell them that the person is an actor; in the other, the person is hooked up to electrodes. (The curtain person isn't hooked into anything but does see flickering lights as the students press the buttons.

The curtain person is the dependant variable measured in dB screams/howls. This in turn affects the student, the IV, who makes judgements as to whether the curtain person is lying. The more lies, the more button presses. The question is whether the person's screams or the persons ability to convince the student that they are telling the truth causes the student to reduce the number of button pushes.

You should be able to get a number of different correlations in this feedback loop. You tell one group that the curtain person has been told to inject lies periodically at their discretion to see whether the student can discern truth from lies based on screams or persuasion.
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Author Commented:
sorry, i need one with no test sub. thx
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Commented:
How can you do a psychology experiment without a test subject?
If not psychology, what field are you interested in?

All of this information would help get to an acceptable answer.
The more you share, the better the advice.
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Commented:
>> How can you do a psychology experiment without a test subject?
Maybe in a decade, tests will be performed on AI subjects.
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Author Commented:
im in 7th grade. I need trials with no test subjects. no organic stuff tested
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Commented:
"While psychological knowledge is often applied to the assessment and treatment of mental health problems, it is also directed towards understanding and solving problems in several spheres of human activity. By many accounts psychology ultimately aims to benefit society."
https://en.wikipedia.org/wiki/Psychology
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Commented:
I hope we helped.
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