Physics 30S

Vectors

Hi Everyone: It’s Wednesday, October 18, 2017. Well, we had a grand time last night doing vector drawings, and you learned and picked up on it very well. Here are a few videos that review what we’ve done and preview what is to come. The lesson at the end of the day was, YOU CAN ADD VECTORS IN ANY ORDER AND STILL GET THE SAME RESULTANT.

https://www.youtube.com/watch?v=OpNd6nGN-pY   We’ve seen some good Kinematics videos from him. The notation is a bit different than ours but not enough to cause any problems.  PhysicsEHhttps://www.youtube.com/watch?v=7p-uxbu24AM   Vector addition Part 1 – D. Cauf.https://www.youtube.com/watch?v=g_TnqKX5ybY  vector addition – algebraically (time: 14:43) packed with information -  it will probably take at least an hour in class to go through this. Phunscience
        A reminder that there is no class on Thursday, Oct 19.

Physics 30S. So today is Monday, October 2, and I just wanted to give you a quick update about what we did and what is to come in the next few class or so. We are studying Uniform Motion and Kinematics graphs. We studied P/T and V/T graphs and the meanings of their slopes and area between the line and the x-axis for V/T graphs.

On Tuesday we will continue this discussion to include curved P/T graphs and introduce the concept of acceleration and its associated graph. That will be followed by an in-class assignment based on those items.

In relation to the kinematics graphs, we will develop a few of the “Big Five” kinematics equations that use t, v₁ , v₂, d, and a. Finally, we will use our Big Five to solve problems that involve Uniform motion.

Graphs of Kinematics

Ok here are three videos that match up with my lesson that I gave on Tuesday evening. Now the concepts are all the same but you may see a very slight terminology change or numerical change. They are 99% the same, though. Enjoy😊

https://www.youtube.com/watch?v=-1ztosop_aY  Part 1

https://www.youtube.com/watch?v=0bys19z6Pow&t=23s  Part 2

Part 3 is omitted for now – Determining instantaneous velocity

 from a curved Position-Time graph. We’ll do that on Tuesday Oct. 3.

https://www.youtube.com/watch?v=Ka9xWAmWBow&t=65s  Part 4

Welcome to a new school year!

  September 6, 2017

  Well, about 7 or 8 years have passed since my last post and, in the meantime, I have "retired". However, I have just come out of retirement and have this fantastic opportunity to work again at the school that I love.  My assignment this academic year will be Basic and Continuing Math in the afternoons (full year), Physics 30S on Tuesday and Thursday evenings (first semester), and Pre-Calculus 40S on Monday and Wednesdays in second semester.   

      Now that I know my assignment and have been thinking of the content of my lessons, it's important to see exactly who it is I'm planning the lessons for! Teaching is not a thing where you just rattle off a bunch of facts and formulas to people who are sitting at desks. Each person has their own story to tell, and I want to hear each one. We teach people, not things. When we get to know each other - our likes, dislikes, challenges, accomplishments, dreams, families, values, etc., it makes the experience much more positive. Not to brag too loudly about myself, but if I know you, and some of things you like to do, I will almost certainly be able to create examples just for you. So, lets get to know each other and quickly.

      What exactly is the purpose of this blog? That is a great question. Its purpose is to keep you 'in the loop' about what we've done in class. It may contain a very brief review, a link to one of my videos or videos that I have found valuable, scheduling information (tests, activities, class trips, holiday and year-end parties) and so on. It is not to take the place of being in the classroom but it will supplement (add to) what has been done in class.

       So here is what you can do. Log onto the blog and look at the most recent post. Scroll down to the heading that applies to you – Basic Math, Continuing Math, Physics 30S or Pre-Calculus 40S. The content of the blog will tell you what to do next.

       I will try my best to post something each Friday after our school week is through. I’m looking forward to chatting again. In the meantime, have a great week.

          

              Joe 

Test Talk

Hi All you Math People Out There:
Okay, here's what we've done in 40S Consumer Math so far this semester:

Note: 50% of the test will be comprised of the items with a '*' before them.

1) Tenant Insurance (standard, comprehensive, deductible)
2) Before and after taxes (prices)
3) Exchange rates (bank buying, bank selling)
4) % Grid (part, %, whole, 100)
5) Fuel Economy Grid (# of litres, 100 km, litres used, distance traveled), remember, less is better
6) Rounding Decimals
7) Simple Interest: I=Prt
8) Compound Interest: A=P(1 + r/n)^nt (use for interest, adjustment, and possession dates)
*9) Life Insurance (term, whole, cash surrender value)
*10) Mortgages

Recall that that the assigned homework questions (from your dark blue duo tang) were
page 22: # 1,2,3a,3b,4a,5a,5b,6,7
page 23: all
page 32: 1a,1b,1c,1d,2,3,7
Also I assigned questions 1,2 and 3 of the chapter review (dark blue duotang).

We also had some worksheets on simple and compound interest

Good luck studying! See you Monday!
Joe

Big Exam Hint

OK everyone - here is the big hint as promised. Here is the question word-for-word from the exam. You may write this answer on paper and bring it in, but you must not share it.

"Our front door has a hook andwe did a demonstration on it. A foam cup was hung from the hook and the length of the elastic was measured. With no pennies in the cup the elastic stretched 26 cm. The more pennies that were put into the cup the longer the elastic band would stretch. Finally, we had 130 pennies in the cup. The data points (0,26) and (130, 39) are shown on the graph below. Draw a line between these two points and answer the question that follow."

a) What kind of variation is this? Answer: Partial variation
b) What is the dependent variable and what does it represent? Answer: the dependent variable is S and it represents the amount of stretch in cm.
c) What is the slope of this line? (Include units) Answer: 0.1 cm per penny
d) Give a formula for this graph. Answer: S = 0.1n + 26
e) Approximately how far will the elastic stretch with 40 pennies? Answer: Approx. 30 cm

Answers to 20Sconsumer practice test

Hi Again Math People (20S Consumer- Joe's afternoon class, that is):

This entry is for C-L (you know who you are) and anyone else who may not have picked up the review sheet for test 1 or the answer key. Here are the answers.

Part A

1. 1404 2. 1701 3. 587 4. 133r2

5. 3 hrs,52 mins 6. 5.8

7. Sandy, 84%; Billy, 80%; Tommy-Joe, 86%

8. CPP, Federal Tax, Provincial Tax, E.I., possibly union dues

Part B

1. $106.92 2. $165.20 3. a) 7.5 hrs b) $108.75

4. do not do 5. $9.86

6. The job with 15% raise is better by $0.19

7. a) $468.75 weekly b) $2437.50 or 2437.76 (either are acceptable)

8. $34,424 9. $14.09 10. $15,868.50 11. $10.71

There is no number 12. 13. 21 hrs, 25 minutes

14. 3.35 hrs. 15. 8:43 or 8 hrs., 43 minutes

16. A pension for when you retire or if you become disabled and can't work

17. Both branches of government have their own expenses.

Part C

1. His income should read $804.80 bi-weekly, which is $10.06 per hour

2. $28.82 3. $520 4. $17.80 5. $7.80

Three-Week Update

Hi Math People Out There:

Well, three weeks of our 18-week courses are now in the books and I thought I'd give you an update on what's been happening in class – so, just scroll down to your class and get up to date.
40S Consumer (morning class):
Exploration 1 – Personal Finance (pages 22,23; # 1 – 8, (not 5(c)))
Exploration 2 – Mortgages (pages 32,33; # 1 – 8 all)
Simple Interest Formula Questions and Calculations
Exploration 4 – Gross Debt Service Ratio (page 53, # 1 – 3)
40S Consumer (evening class):
Exploration 1 – Personal Finance (pages 22,23; # 1 – 8, (not 5(c)))
Exploration 2 – Mortgages (pages 32,33; # 1 – 8 all)
Simple Interest Formula Questions and Calculations
Exploration 3 – Exploring Mortgage Payments – (just a discussion on this, no
questions were assigned – will touch on some possible questions later)
Assigned the first half of last year's Test 1 as homework.
Note: After class on Monday, Oct. 5, the morning class and the evening class will match again as they should.

20S Consumer (afternoon class): Here is an update of the last few classes.
- We've been calculating wages based on regular and overtime hours worked.
- Learning to tell time on the 24-hr. clock.
- Next we did payroll deductions and looked carefully at the examples on pages
56, 58, and 60.
- I introduced the % grid and we learned how to do questions that call for a 10%
or 12% raise.
The last assignment I gave was pages 73 – 75, # 1 – 11.

31G Math Essentials (evening class): Finished the “basics” and gave two quizzes. Gave the first quiz back to some and suggested that they finish the rest of the questions for more practice. If you are not getting 85 - 90% on the basics you need to keep practicing, because the first test is going to be all no calculator.
This Tuesday coming, Oct. 6, we will be starting into positive and negative numbers. I will also be doing some basics of algebra and geometry. If I stay true to my plan, I'll be combining the concepts where possible.
Your job is to get those basics of fractions, decimals and percents down as best you can.
See you in class,
Joe