1. Scientific
Method

2. Mass vs. Weight First we will define Matter…
Matter – anything that has mass & takes up space
Mass – measurement that tell how much matter you have (kg)
Weight – measurement of the amount of matter you have with the effect of gravity

3. For Example… Let’s say a guy weighs 150 pounds
This is about 54 kg in mass
What would his mass be on the moon if the moon’s gravity is about 1/6 that of the Earth?

4. Hmmmm… The answer is … 54 kg Would it be 1/6 of 150 pounds?
Would it be 1/6 of 54 kg?
Would it be 150 pounds
Or would it be 54 kg?
The answer is …
54 kg

5. Some of you are scratching your heads…
The reason is because gravity has NOTHING to do with mass – that’s only for weight
His mass did not change only his weight changed

6. Accuracy vs. Precision
Accuracy – How close you are to the correct answer
Precision – How close your answers are together

7. For Example… Let’s say we had the following dart board
Is the accuracy good or bad?
Accuracy - GOOD
Precision - GOOD
Is the precision good or bad?

8. Try this one Let’s say we had the following dart board
Is the accuracy good or bad?
Accuracy - BAD
Precision - GOOD
Is the precision good or bad?

9. Try this one Let’s say we had the following dart board
Is the accuracy good or bad?
Accuracy - BAD
Precision - BAD
Is the precision good or bad?

10. The Scientific Method
Scientific Method – a systematic approach used in scientific study
It is an organized approach for scientists to do research
Provides a method for scientists to verify their work and the work of others

11. Steps for the Scientific Method
Step # 1 – Observation
Observation – the act of gathering information (data)
Qualitative data – information with NO numbers
(hot, blue, rainy, cold)
Quantitative data – information with numbers
(98°F, 80% humidity, 0°C)

12. Steps for the Scientific Method
Step # 2 – Form a Hypothesis
Hypothesis – tentative explanation for what has been observed
There is no formal evidence at this point
It is just a gut feeling

13. Steps for the Scientific Method
Step # 3 – Experimentation Experimentation – a set of controlled observations that test the hypothesis
Independent variable – the thing that you change in the experiment
Dependant variable – the thing that changes because you changes the independent variable
Constant – something that does not change during the experiment
Control – the standard for comparison

14. We will start with a balloon at room temperature
For example…
Let’s say we are going to do an experiment testing what happens when you heat and cool a balloon…
We will start with a balloon at room temperature

15. Now we will change something…
I will add heat to one balloon
It will expand
What will happen to the balloon’s size?

16. Now let’s cool things down
I will add cool down the balloon
It will get smaller
What will happen to the balloon’s size?

17. So what is what? What variable did YOU change?
Temperature
What variable changes BECAUSE you changed the temperature?
Size of the balloon
What is did not change in the experiment?
Amount of air in the balloon, what the balloon is made of…
What balloon did you use to compare the others to?
The room temperature balloon
(Independent Variable)
(Dependent Variable)
(Constant)
(Control)

18. Steps for the Scientific Method
Step # 4 – Conclusion
Conclusion – judgment based on the information obtained