1. Welcome to Class Compare and contrast theories and laws

2. Agenda Quiz Measurement notes – Measurement lab

3. Accuracy & Precision Accuracy: – Freedom form mistakes or errors; Correctness Precision: – The ability to repeat; Repeatability

5. Units of Measurement International System of Units (SI) Makes sharing data and results easier ********

6. Linear Measurement (straight lines) Length, Width, Height Definition: Distance between two points Tool: Meter stick, ruler Base unit of measurement: Meters (m)

8. Area Definition: – How much surface an object covers, 2-D Units of measurement: – m 2, cm 2, etc. Formula: – A = L x W

9. Volume Definition: – How much space an object takes up Two types of volume: – Regular and irregular Regular solids are box like – Volume is found by measuring length, width and height The volume of irregular objects is found by water displacement

10. Volume (cont.) Tool: – Regular = ruler or meter stick – Irregular = graduated cylinder Units of measurement: – m 3, cm 3 (for solids) – L, ml (for liquids) Formula: – V = L x W x H 1cm 3 = 1ml

13. Welcome to Class Define Accuracy and Precision

14. Agenda Finish Volume notes Lab

15. Volume Definition: – How much space an object takes up Two types of volume: – Regular and irregular Regular solids are box like – Volume is found by measuring length, width and height The volume of irregular objects is found by water displacement

16. Volume (cont.) Tool: – Regular = ruler or meter stick – Irregular = graduated cylinder Units of measurement: – m 3, cm 3 (for solids) – L, ml (for liquids) Formula: – V = L x W x H 1cm 3 = 1ml

19. Volume Lab

20. Welcome to Class How do you read a graduated cylinder?

21. Agenda Review measuring Volume of regular objects lab

22. Volume Definition: – How much space an object takes up Regular solids are box like – Volume is found by measuring length, width and height Formula: – V = L x W x H

23. Volume of other Regular Objects Spheres – Formula : V = 4/3 πr 3 Cylinder – Formula: V = πr 2 h *π = 3.14 Formulas are on Page 830 in the book

24. Measuring spheres/circles Measure end to end – Use paper on edge of spheres Measured diameter we need radius – Radius = ½ diameter – So: if d = 10 then r = 5

25. Volume of Regular Objects Lab

26. Welcome to Class What is the formula we use for a sphere? Cylinder?

27. Agenda Finish measuring volume of regular objects Mass notes Mass Lab

28. Mass Definition: – The amount of matter in an object Tool: – Triple beam Balance Base unit: – Grams (g) – A penny has the mass of about 1g 1g = 1cm 3 for water only

29. Making a connection When you use water (and this works only for water) 1 ml = 1 cm 3 = 1 g

31. Weight Definition: – The gravitational pull on an object Tool: – Scale Base unit: – Newton (N)

32. Mass Vs. Weight

33. Temperature Definition: –M–Measurement of the average kinetic energy of molecules Tool: –T–Thermometer Base unit: –C–Celsius (c o ) and Kelvin (k o )

35. Mass Lab

36. Welcome to Class List the common tools for measurement that we use to find linear measurements, volume and mass.

37. Agenda Finish mass lab Practice measuring QUIZ TOMORROW!