Experiments are used to test a hypothesis (idea). The first thing you need to do is work out what you want to demonstrate or show. After that there are so many millions of examples this question is impossible to answer.
The following steps would aid in the design of a good experiment:
Identify what you want to investigate (e.g. Does it hurt to touch a hot iron) Consider what should be in the experiment (e.g....
state a hypothesis identify the independent variable in the experiment identify two conditions that should be kept the same in all experimental setups state one example of experimental data that...
Because, some results may have been skewed or wrong and doing multiple trials helps provide assurance that the results are correct, and it also allows you to get an average in some cases.
Well you need a good idea, or concept TO experiment. Then you just need to put in the hard work, to research, then test. Oh and you also need really ggod spelling. Joking, and look up something you...