SCIENTIFIC METHOD.

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Presentation transcript:

SCIENTIFIC METHOD

Understand our World In science we are constantly attempting to understand the world around us. In order to understand the world we need to have a goal in mind, this is where the scientific method comes in.

Step 1: Ask a question / Observe a Problem You go to your car in the morning and when you try to crank the car it won’t start. What is the question/problem?

Step 2: Background Research What is the first thing you are likely to do?

Step 3: Construct a Hypothesis Hypothesis is a tentative explanation, that can be tested to determine if it is valid. “If, then statement” After talking to your parents or checking the internet, you believe that the battery is dead. What might your hypothesis be?

Step 4: Test Hypothesis Experiment How might you test your hypothesis?

Step 5: Analyze Data If after you replace the battery the car still won’t start then what can you deduce?

Step 6: Repeat After your first hypothesis failed to be correct you must go back and create a new hypothesis.

Variables and Constants Everything in your experiment can be labeled as a variable or a constant. In your experiment you had two types of variables, independent and dependent. The independent variable is what you manipulated. What was the independent variable in your experiment? The dependent variable “depends” on the independent. What was the dependent variable in the experiment?

Constants and Control In your experiment, there are things that change (Variables) and things that don’t change (Constants). Constants are all the other factors not manipulated. Spark Plugs, Gas, Alternator etc. Control is a completely separate group that you compare your results against. Think about a placebo and how it is used in medical experiments

Laws vs Theories

Laws and Theories A law is used to predict what will happen, while a theory tries to explain phenomena. You drop a pencil. The LAW of gravity states that it will fall, it does not matter why it falls You find a fossil of a half reptile/half bird. The THEORY of evolution tries to explain why.

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