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.

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.

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.

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.

• 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.

LAB Grading RUBRICRUBRICMISSING (mimi): No written lab submitted

INCOMPLETE (incinc): Lab submitted but key components (< 6.5 pts) (< 6.5 pts) missing.

- missing calculations

- missing graphs

- questions/conclusion unanswered

6.5 – 8 pts6.5 – 8 pts: Lab submitted with at least two (2) components missing

8.5 – 9 pts8.5 – 9 pts: Lab submitted with at least one (1) components missing

10 pts10 pts: Lab submitted and fully completed

MR. BALDWIN’S PHYSICSMR. BALDWIN’S PHYSICS

ASSIGNMENT RUBRICRUBRICMISSING (mimi): NONO Assignment submitted

INCOMPLETE (incinc): Assignment submitted with minimal work done.

-- Homework format not followedHomework format not followed

- - Problem solving format not followedProblem solving format not followed

1 – 31 – 3: Weak attempt made/NONO work shown

4 – 54 – 5: : Fair attempt made/LittleLittle work shown

6 – 86 – 8: Good attempt made/SomeSome work shown

9 – 109 – 10: Work is CompleteComplete & done to specification

MR. BALDWIN’S PHYSICSMR. BALDWIN’S PHYSICS

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.

classroom ruleS

Consequences

1. VERBAL WARNING

2. VERBAL WARNING & WRITTEN NOTATION

3. VERBAL WARNING, WRITTEN NOTATION & STUDENT/TEACHER CONFERENCE

4. FAMILY GROUP ADVISOR/PARENTAL NOTIFICATION

5. PARENT/FAMILY GROUP ADVISOR CONFERENCE

6. REFERRAL TO ADMINISTRATION.

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.

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 Quiz 1: Prefixes (Let’s have phun)Complete the quantity using the correct metric prefixes. (ex. 1012 – tera, T; 1012 bulls = 1Tbull = 1 terabull)

1.106 phones

2.10-6 phones

3.101 cards

4.109 lows

5.10-1 mates

6.10-12 boos

7.2 x 102 withit

8.2 x 103 mockingbirds

13

AnswersAnswers1. M-phones (megaphones)

2. μ-phones (microphones)

3. Da-cards (deka cards)

4. G-lows (gigalows)

5. d-mates (decimates)

6. p-boos (picoboos)

7. 2 h-withit ( 2 hectowithit)

8. 2 k-mockingbird (2 kilomockingbird)

14

Subdivisions and Multiples of SI UnitsSubdivisions and Multiples of SI Units

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?

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).

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)

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?

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).

Definitions of Some Standard Units

Quantity Unit Standard

Length Meter Length of the path traveled by light in 1/299,792,458 second.

Time Second Time required for 9,192,631,770 periods of radiation emitted by cesium atoms

Mass Kilogram A lump of Platinum cylinder in International Bureau of Weights and Measures, Paris

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

Converting UnitsConverting 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

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

Section Check

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)

Question

A. 2.5×101 m/s

B. 1.5×103 m/s

C. 2.5 m/s

D. 1.5×102 m/s

90 km

hr

1000

1

m

km

1hr

60 min

1min

25 /

60m s

s

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?

• LET’S WORK ON WORKSHEET

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:

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.

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 ________

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.?

Check!Which of the following representations is correct when you solve 0.030 kg + 3333 g using scientific notation?

A. 3.4×103 g

B. 3.36×103 g

C. 3×103 g

D. 3363 g

Accuracy & Precision

• Accuracy is the proximity of measurement results to the true value

• Precision, the repeatability, or reproducibility of the measurement

Define accuracy and precision?

OR

Create two sentences each using the words precision and accuracy

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. .

Read the following question and justify who gets the most accurate and precise value

A. Kevin got the most precise and accurate value.

B. Ronald’s value is the most accurate, while Kevin’s value is the most precise.

C. Ronald’s value is the most accurate, while Paul’s value is the most precise.

D. Paul’s value is the most accurate, while Ronald’s value is the most precise.

Section Check

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.

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.

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