1. The Nature of Science

2. Objectives Compare and contrast hypothesis, theory and law. 12.1.1.a Know the steps of the scientific method. 12.1.1.b Distinguish between control, independent and dependent variable. 12.1.1.c Determine if a question is testable. 12.1.1.a

4. Define “theory” – An idea that explains a phenomena and is supported by many experiments. Define “law” – A statement or formula that accurately predicts events Define “hypothesis” – An educated guess hypothesis  theory  law

5. Chubby Bunny Data Name# of Marshmallows Eaten

7. Parts of An Experiment Independent Variable – The thing you are testing. Dependant Variable – The thing you are measuring. Constant – All the stuff you keep the same. Control – Something to compare your results to.

8. Remember A good experiment tests ONE independent variable at a time

10. Table 4. Impact failure threshold of 1018 steel Temperature (deg C)Mean Impact Energy (joules) Cold RolledAnnealed -195 1.4 0.8 0 62.2 50.5 20 70.4 202.7 100 77.3 231.0 Table

11. Graph

12. A good graph has 3 things! Title – Title must explain what is happening. Axis Labels – Don’t forget the units. Fill available space – Make it as big as possible.

13. Chubby Bunny Data Name# of Marshmallows Eaten

15. The English System of Measurement Grew out of the creative way that people measured for themselves Familiar objects and parts of the body were used as measuring devices.

16. English System Length –12 inches (in) = 1 foot (ft) –3 feet = 1 yard (yd) – 5280 feet = 1 mile (mi) Weight –16 ounces (oz) = 1 pound (lb) –2000 lb = 1 ton Volume –16 tbsp = 1 cup (c) 8 ounces (oz) = 1 c 2 c = 1 pint (pt)

17. YUCK!

18. Metric System (SI) pg 18 Based on powers of 10 Base Units QuantityUnitSymbol Length kelvin A candela Mass mole s

19. The Power of 10 PrefixSymbolMultiple or Sub multipleValuePower of ten megaMone million1,000,000 10 6 kilokone thousand1,000 10 3 hectohone hundred100 10 2 dekadaten10 decidone tenth0.1 10 -1 centicone hundredth0.01 10 -2 millimone thousandth0.001 10 -3 micro  one millionth0.000001 10 -6

20. Now Try These! 1. What is the prefix for 1000? 2. What does the prefix deci represent? 3. What is the prefix for.001? 4. What does the prefix centi represent? 5. What is the prefix for 100?

21. Metric Conversions

22. Types of data Qualitative –Descriptions of what is happening. James I laughing while he says “Chubby Bunny” Quantitative –Numbers or quantities James could fit 7 marshmallows in his mouth.