7th grade chap 1 scientific method ppt - mrs czeschin's...
TRANSCRIPT
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SCIENTIFIC METHOD
Chapter 1
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What is science ????
• Science is the study of natural events through observation and experimentation resulting in an organized body of knowledge.
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• Series of steps to follow in order to solve a problem in science. Steps are as follows:
1. Identify the problem
2. Gather data
3. Form a hypothesis
4. Test your hypothesis
5. Analyze your results
6. Draw a conclusion
SCIENTIFIC METHOD (EXPERIMENTAL RESEARCH DESIGN)
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Identify the problem
• Should be stated in the form of a question.
• The goal of the experiment should be to find the answer to your questions (problem).
• Ask yourself: What is it you want to know?
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Ways to gather data -
Data tables Charts Graphs
Scientific Journal - record observations Take measurements - a way to describe the world with numbers. Measurements must be accurate in
order to remove bias. Models -Used to show items too small to easily, too expensive, too large, too dangerous, etc.
Make observations - use all of your senses
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Hypothesis
• A prediction or statement that can be tested through experimentation. MUST BE TESTABLE. Should attempt to solve your problem.
• Begin your hypothesis with “I think” or “We predict”.
• A hypothesis is different from an inference. A hypothesis is a prediction that must be testable, but an inference is a prediction, but is NOT testable through experimentation.
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Test your hypothesis - by performing an experiment
• Experiments should be performed the same way each time and they should be repeated to test for consistency and accuracy.
• Parts of a good experiment include: It must be a testable problem
✴ Two groups in every good experiment -
✴ 1. Variable/Experimental group - independent variable is applied to this group. (Variable - factor being tested)
✴ 2. Control group - standard for comparison.
✴ Independent Variable - variable changed, graphed on the X-axis (horizontal axis). Variable controlled by the person performing the experiment. It begins with the letter I - it is what “I” the experimenter change between the control group and the variable group.
✴ Dependent Variable - factor being measured, graphed on the Y-axis (vertical axis). What happens as a result of the independent variable being applied - results.
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VERY IMPORTANT
• A well planned experiment has only ONE variable at a time. WHY????
✦ If you change more than one variable at a time, you can’t be sure which variable caused you to get your results.
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Analyze your Results
•Look over your results
•What do they mean?
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Based on your experiment come up with a conclusion
•Was your hypothesis correct? incorrect?
• Make a statement saying so
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Scientific Results
• No matter what the research results, it is important to communicate the results to others to further the advancement of technology, health, and many other areas.
• Technology - is the application of science to make products or tools that people can use.
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Descriptive Research
• Descriptive Research - used to investigate problems when it is impossible to perform experiments.
• Example: Determining the origin of a disease.
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Gravity
Gravity – an attractive force between 2 objects that have mass
The greater the distance from the sun = less force of gravity
The greater the mass = greater the pull of gravity (EX: Jupiter and Saturn are large planets)
Mercury is small and has smaller mass than Venus but Mercury’s distance to the Sun is shorter than that of Venus. Mercury experiences a stronger gravitational pull than Venus. Venus is closer to the Sun than Earth is and experiences a stronger gravitational pull than Earth does. (Venus & Earth are about the same size (Earth’s twin)
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YOUR ASSIGNMENT
• Come up with an experiment to prove or disprove the effect of gravity
• Fill in lab report provided
• You can use cars and/or balls provided
• You will present your experiment and findings with the class on Monday/Tuesday
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How to use the balances?
• We will practice using them prior to doing this project