why do scientists use experiments?

Answer 1

To confirm/validate theories by means of PERSONAL OBSERVATION.

When you have observed it for yourself, the status of a theory / conjecture / belief / faith / dogma / whatever... changes from BELIEF to first hand KNOWLEDGE.

This is what differentiates science from religion...
Religion works on faith,
Science works on first hand, observable knowledge.

Unless you have done the experiment yourself, you are still depending on belief in somebody else's testimony.
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Answer 2

Experiments are used to test ideas as others have said.

A second important aspect to this "scientific method" is that another totally independent scientist has to be able to run the same experiment and get the same result before any idea is accepted as factual. The reason for this is that the first scientist may have built in some unknown, even to himself/herself, bias trying to prove their idea.

Answer 3

Because science is about facts, and in order to be factual, something must be proven.
A scientist comes up with a theory or Hypothesis about how something might work. He then does tests, or experiments to observe and support his hypothesis. If said tests succeed, he can than make a Conclusion that his initial Theory was correct.

Answer 4

The job of a scientist is to understand nature. If you want to study nature, you have to observe it. Setting up an experiment is a way of generating observations. But more than that, in an experiment one can set up the situation so that known effects are accounted for. Such a "controlled xperiment" allows the experimenter to isolate only the unknown quantity that is of interest to him/her.

Answer 5

Theories in science are put forward by one group of scientists and another group will perform experiments to prove or disprove those theories.

Answer 6

To test theory or develop new ideas by recognizing patterns

Answer 7

To test hypotheses that they have come up with to explain the world around them.

Answer 8

To test hypotheses...