Mr. Baldwin PHYSICS Mathematics & Measurement 9/9/2013

1. Mr. Baldwin PHYSICS Mathematics & Measurement 9/9/2013 Aim: Why are rules and procedures important? What is Physics? Do Now: What is Physics? (Write some bulleted point on what you think Physics is all about.) Homework: Go to my page on www.whsad.org Download, read, print and sign class contract, and return it by Thursday 9-12-13.

2. Classroom Agenda • Do Now • Class Instructions • Group Activity / Worksheets • Class Reflection • Bathroom passes will only be issued after classroom instructions are finished • (No issuance 10 mins. after & before bell). • Derogatory & Offensive Language & tone of voice is unacceptable.

3. Homework… • Due at the beginning of the class on the assigned due date. • Absolutely No Excuses. Absolutely No LATE homework will be accepted. • Homework is to be done IN PENCIL on an 8 ½” x 11” white lined filler paper, smooth on all sides, and written on one side only. Your name should be written legibly in the top right corner of your homework and stapled. • A signed form from a parent/guardian is required to make up any work.

4. Laboratory… • All students taking Regents level courses are required to meet the laboratory requirement set forth by the NYS Commissioner of Education. • Failure to complete the 1200 minutes laboratory assignments results in being barred from taking the Regents Exam.

5. Labs will be done in groups. Labs are to be formally written up individually and returned the following week. • Any plagiarism shall count as a ZERO for both parties involved.

6. MR. BALDWIN’S PHYSICS LAB Grading RUBRIC MISSING (mi): No written lab submitted INCOMPLETE (inc): Lab submitted but key components (< 6.5 pts) missing. - missing calculations - missing graphs - questions/conclusion unanswered 6.5 – 8 pts:Lab submitted with at least two (2) components missing 8.5 – 9 pts:Lab submitted with at least one (1) components missing 10 pts:Lab submitted and fully completed

7. MR. BALDWIN’S PHYSICS ASSIGNMENTRUBRIC MISSING (mi): NO Assignment submitted INCOMPLETE (inc): Assignment submitted with minimal work done. -Homework format not followed - Problem solving format not followed 1 – 3: Weak attempt made/NO work shown 4 – 5: Fair attempt made/Little work shown 6 – 8: Good attempt made/Some work shown 9 – 10: Work is Complete & done to specification

8. classroom ruleS Responsible for Your Work. Every question is worth asking. Speak with appropriate Language. Punctuality is a necessity. Establish a positive environment. Come prepared to work & learn. Take turns speaking.

9. Consequences • VERBAL WARNING • VERBAL WARNING & WRITTEN NOTATION • VERBAL WARNING, WRITTEN NOTATION & STUDENT/TEACHER CONFERENCE • FAMILY GROUP ADVISOR/PARENTAL NOTIFICATION • PARENT/FAMILY GROUP ADVISOR CONFERENCE • REFERRAL TO ADMINISTRATION.

10. What is Physics? Physics is a branch of science that involves the study of the physical world: energy, matter, and how they are related. Learning physics will help you to understand the physical world. • Physics uses mathematics as a powerful language. • In physics, equations are important tools for modeling observations and for making predictions.

11. Mr. Baldwin PHYSICS Mathematics & Measurement 9/11/2013 Aim: What are standard units of measurement? Do Now: A standard class period is approximately a microcentury. How long, in minutes, is a microcentury? Homework: Worksheet 1.2 International System of Measurement

12. Quiz 1: Prefixes (Let’s have phun) Complete the quantity using the correct metric prefixes. (ex. 1012 – tera, T; 1012 bulls = 1Tbull = 1 terabull) • 106 phones • 10-6 phones • 101 cards • 109 lows • 10-1 mates • 10-12 boos • 2 x 102withit • 2 x 103 mockingbirds

13. Answers • M-phones (megaphones) • μ-phones (microphones) • Da-cards (deka cards) • G-lows (gigalows) • d-mates (decimates) • p-boos (picoboos) • 2 h-withit ( 2 hectowithit) • 2 k-mockingbird (2 kilomockingbird)

14. Subdivisions and Multiples of SI Units

15. METRIC PREFIXES revised These are the standard SI prefixes for indicating powers of 10. CHECK Can you give any common everyday examples where these prefixes are used?

16. 7 Basic Units of Measurement In Physics, we will be working in the SI system, where the basic units are kilograms, meters, and seconds (m.k.s).

17. Mr. Baldwin PHYSICS Mathematics & Measurement 9/12/2013 Aim: Why is the metric system easier to learn than the British system? Do Now: Write a short simple response to the Aim above.(i.e. What are some of the advantages of the metric system?) Homework: Worksheet 1.2 International System of Measurement (# 8-13)

18. Did you come up with something like this? The metric system is easy to use because all the units are based on factors of 10. Let’s see what you came up with?

19. 7 Basic Units of Measurement In Physics, we will be working in the SI system, where the basic units are kilograms, meters, and seconds (m.k.s).

20. Definitions of Some Standard Units

21. Examples of SI units include:Can you give some examples of metric units? • a. Volt (V) for voltage • b. Liter (L) for volume • c. Meters/second (m/s) for speed • d. Kilogram/meter3(kg/m3) for density • e. Joule (J) for energy • f. Watt (W) for power

22. Converting Units Converting between metric units, for example from kg to g, is easy, as all it involves is powers of 10. Converting to and from British units is considerably more work. Example: given that 1 m = 3.28084 ft, this 8611-m high mountain is how many feet high. 28250 feet

23. Mr. Baldwin PHYSICS Mathematics & Measurement 9/13/2013 Aim: How do we convert units between the metric system and British system? Do Now: Given that 1 m = 3.28084 ft, this 8611-m high mountain is how many feet high? (write your answer in scientific notation) 28250 feet

24. Section Check Question A car is moving at a speed of 90 km/h. What is the speed of the car in m/s? (Hint: Use Dimensional Analysis) • 2.5×101 m/s • 1.5×103 m/s • 2.5 m/s • 1.5×102 m/s

26. Order of Magnitude: Rapid Estimating A quick way to estimate a calculated quantity is to round off all numbers to one significant figure and then calculate. Your result should at least be the right order of magnitude; this can be expressed by rounding it off to the nearest power of 10. Section Check Calculate approximately how many basketballs (diameter = 75cm) can fit in this classroom randomly AND orderly stacked one atop the other?

27. LET’S WORK ON WORKSHEET

28. Mr. Baldwin PHYSICS Mathematics & Measurement 9/16/2013 Aim: Why are significant figures important? (What is precision and accuracy?) Do Now: How many seconds are there in a year? Convert you answer to scientific notation and round it off to 2 decimal places. Homework:

29. Significant Figures The number of significant figures is the number of reliably known digits in a number. It is usually possible to tell the number of significant figures by the way the number is written. Some Examples: 23.21 cm has 4 significant figures 0.062 cm has 2 significant figures (the initial zeroes don’t count) 80 km is ambiguous – it could have 1 or 2 significant figures. If it has 3, it should be written 80.0 km.

30. How many significant digits are in these measurements? a) 25.001 cm ________ b) 0.00012 kg ________ c) 35,000 m/s ________ d) 5.611 x 105 s ________ e) 0.0120 mm ________ f) 2.00 x 10-3 mL ________ g) 750 dg ________

31. Operations Involving Significant Figures When multiplying or dividing numbers, the result has as many significant figures as the number used in the calculation with the fewest significant figures. Example: 11.3 cm x 6.8 cm = 77 cm When adding or subtracting, the answer is no more accurate than the least accurate number used. CHECK! Can you create ONE example each of addition and subtraction involving sig. figs.?

32. Check! Which of the following representations is correct when you solve 0.030 kg + 3333 g using scientific notation? • 3.4×103 g • 3.36×103 g • 3×103 g • 3363 g

33. Accuracy & Precision Define accuracy and precision? OR Create two sentences each using the words precision and accuracy • Accuracy is the proximity of measurement results to the true value • Precision, the repeatability, or reproducibility of the measurement

34. Section Check Read the following question and justify who gets the most accurate and precise value Ronald, Kevin, and Paul perform an experiment to determine the value of acceleration due to gravity on the Earth (980 cm/s2). The following results were obtained: Ronald: 961 ± 12 cm/s2, Kevin: 953 ± 8 cm/s2, and Paul: 942 ± 4 cm/s2. . • Kevin got the most precise and accurate value. • Ronald’s value is the most accurate, while Kevin’s value is the most precise. • Ronald’s value is the most accurate, while Paul’s value is the most precise. • Paul’s value is the most accurate, while Ronald’s value is the most precise.

35. Answer: C Reason: Ronald’s answer is closest to 980 cm/s2, hence his result is the most accurate. Paul’s measurement is the most precise, it’s within 4 cm/s2. The precision of a measurement is one-half of the smallest division of the instrument.

36. Formulate your OWN question • Each person is to come up with a similar question and have the person in front or behind you answer the question.

37. In the measurement, 86.21, the “2” is (certain, estimated) and (significant, not significant). The “1” is (certain, estimated) and (significant, not significant).