Thursday November 25th, 2010

Today in class we watched a video called "Dark Matter", and received Worksheet 1 & Worksheet 2. Worksheet 1 contained multiple choice questions related to the video, and Worksheet 2 contained questions regarding the information shown on the video. We went over the answers for Worksheet 1, and #1 of Worksheet 2. We are expected to do the rest of the questions on our own.

We also received a worksheet called "Dark Matter within a Galaxy". This sheet, along with any other work you have not completed is tonight's homework.

Low Earth Orbit Simulation

Newton's Cannon

Last Friday November 19

Hey guys, sorry about the delay, I forgot

We worked on several sheets that were given to us including
- a review on Gravitational Potential Energy
-Gravitational Fields Worksheet
-Escape Speed

Sample Question from "Gravitational Potential Energy Questions"

A 500.0 kg communications satellite is initially at rest on Earth's surface before it is launched into space. What is its gravitational Potential Energy at this point?

Use Formula PEG= - Gm1m2/R
G= 6.67 x 10^-11
m1 = 50.0kg
m2= 5.98x10^24kg (mass of Earth)
R= 6.37x 10^6 (Radius of Earth)

- [(6.67x10^-11)(50.0 kg)(5.98x10^24) / 4.22x10^7m]

PEG= -3.13 x 10^10


If there are any questions or you need the sheets from Friday feel free to ask Mrs. Kozoriz

Sorry again for forgetting about it :P

The gravitational potential energy

Hi everyone,

On Thursday we learn some interesting facts about GPE that equation of PEG = -Gm1m2/R is always produces a negative value.As R increases,the masses get further apart,PEg increases by becoming less negative.As R increases to the point of approaching infinity R → infinity,the potential energy approaches zero,PEg → 0

The differences between

FGand EGPE

1. F inversely 1/R square E inversely 1/R

2. is a vector quantity is a scalar quantity

3. S.I unit measured in Newtons S.I unit measured in Joules

Hey grade 12's, in today's class we watched a film called "Gravity 1" where our task was to write down 5-7 facts that we thought that were interesting on a separate sheet of paper then hand it in. After that we were assigned questions 6-10 in the Green Textbook on page 172.

Homework for today was to complete those 3 sheets that were given to us yesterday, if you haven't received them yet you should have got them today. We will be going over those tomorrow since we didn't today.
- Universal Law of Gravitation
- Transparency 7-2: Gravitation
- Transparency 7-3: Kepler's Third Law

Have a good evening!

Janna's Scribe Post for November 16th 2010 !

Hey guys for today's class we got back our Energy in a Trebuchet worksheet & our questions 3, 4, and 5 that we were to do out of the Green Textbook.
Next we went over our Chapter 8 Study Guide and filled in the blanks in the Universal Gravitation, Newton's Use of His Law of Universal Gravitation & Weighing Earth paragraphs on the first page of the study guide. The answers can be found in the slide post directly below my scribe on the first page of Mrs. K's post. Then we went over the answers of the first three pages in the Chapter 8 Study Guide Motions in the Heavens and on Earth booklet. Again, these answers can be found in Mrs. K's slide post from page 2 on.
After going over the answers we picked up 3 worksheets: Universal Law of Gravitation, Chapter 7 Transparency 7-2 & Chapter 7 Transparency 7-3. If you were away make sure you pick up these worksheets ASAP and do them for we will be going over the answers in class tomorrow. =)

Homework:
- Universal Law of Gravitation
- Chapter 7 Transparency 7-2
- Chapter 7 Transparency 7-3

Happy Homeworking !! :)

Ch.8 Study Guides Answers

Ch.8 study guides answers

View more documents from ekozoriz.

Monday, November 15, 2010

Hello my fellow classmates! It's me Amy scribing again. In today's class, we went over the problems in the green textbook that was assigned to us on Friday. The page number is 172 for those who missed the chance to do those questions. Questions 1-5 were assigned for us as homework and we had gonve over the first two in class today. The other 3 were to be handed in at the end of today's class. I'm assuming those are for marks so hurry up and hand them in before Ms. Kozoriz returns the assignments back to the class! I would give out the answers for question 1 and 2 but sadly they are on the same paper with the 3 other questions that are to be handed in. In other words, I don't have them with me :\. Sorry!!!

So for half of the class, we had worked on those problems. Afterwards, we were given 4 hand-outs from Ms. Kozoriz!!! Those hand-outs included "Concept-Development Practice Page (Chapter 12: Universal Gravitation)," "Chapter 11: Gravitational Intructions," "Issues in Space Exploration: Benefits," and "Chapter 8 Study Guide." Please see Ms. Kozoriz if you missed/don't have any of these hand-outs!!!

We had went over the "Concept-Development Practice Page (Chapter 12: Universal Gravitation)" and "Chapter 11: Gravitational Instructions" worksheet in class.

Here are the answers and what the worksheets look like:

Concept-Development Practice Page (Chapter 12: Univeral Gravitation)

--Check out the cool experiment in question 3!! You'll be amazed, guaranteed :D.

Chapter 11: Gravitational Instructions (Side 1)

Chapter 11: Gravitational Instructions (Side 2)

If you're wondering what "Fold" means, it means the solved equation equals to the "old force." The old force is the force we use to calculate our "Fnew" ("new force") for what we're trying to find. This correlates to having constants (number in front of "Fold") or no constant at all to determine the new force out of Newton's Universal Law of Gravitation equation. For example, if there is "4Fold" means 4 times the "old force." By increasing the "old force" 4 times, a new force ("Fnew") is developed where the it is equivalent to 4 times the "old force." Please see me if you don't understand the concept :).

Along with the other two hand-outs, we were to read the "Issues in Space Exploration: Benefits" package and finish the first 3 pages of the "Chapter 8 Study Guide."

There was not much work to do in class today. So for those who were absent, you guys didn't miss much. That concludes the lession in today's class. If anyone has a question about the hand-outs, you can come see me about any questions and see Ms. Kozoriz for the ones that you didn't pick up. As for a heads up in tomorrow's class, you guys will be receiving an additional 2 new hand-outs called "Transparency 7-2" and "Universal Law of Gravitation." Thanks for reading my post :)!!!

November 12, 2010

Hello everyone!

In physics class that day we had a lab about ellipses, pick the sheet up from Ms.Kozoris, and if any trouble ask a friend or Ms.Kozoris herself. It's not very time consuming so that's a plus!

Reminder that it is due to hand in ASAP!

We also had practice questions to do on pg 172 in the green physics textbook.

November 10, 2010

Today, we got our Circular Motion, Work and Energy Test back that we did on Monday. We corrected it, and we started our new unit. Our new unit is about the Exploration of Space. To start this unit off, Ms.K read a sheet, " Why Explore Space?" . After that we watched a couple of videos of Kepler's three laws. We got the Chapter 8, Study Guide and we went over the first paragraph. We also picked up the sheet, Transparency 7-1. We answered questions on the back of the sheet.

Don't forget to get your Chapter 11 : Enrichment ; Energy in a Trebuchet in the folder.

Just to let you know, no school tomorrow.

Have a nice day off ~

Friday, November 5th, 2010

During Friday's class, we went over and answered questions on the following sheets:
- Kinetic Energy (Transparency 11-1)
- Potential Energy at Varying Locations (Transparency 11-2)
- Grade 12 Physics: Work and Energy: Springs

We also received the following sheets:
- Chapter 10 - Section 10-1 Quiz
- Chapter 11 - Section 11-1/Section 11-2 Quiz
- Chapter 11 - Enrichment

The answers for 'Chapter 10 - Section 10-1 Quiz' and 'Chapter 11 - Section 11-1/Section 11-2 Quiz' are already posted so you may make your corrections. 'Chapter 11 - Enrichment' is due on Wednesday. Also a reminder, the Circular Motion and Work/Energy test in on Monday.

Goodluck!

Chapter 11 Quiz Answers

Ch.11 quizanswers

View more documents from ekozoriz.

Chapter 10 Quiz Answers

10 1 quizanswers

View more documents from ekozoriz.

THURSDAY, NOVEMBER 04, 2010

Today in Physics class, we started off by getting back our Conservation of Energy lab and went through it quickly. Then we were given out 3 worksheets, and reminded to hand in our Power Lab if we have not done so [WHICH IS OVERDUE!] and the lab that we did on Wednesday, regarding the spring and weights [please see previous post to regard about the lab].

The three worksheets provided was the Chapter 11 Transparency 11-1, Chapter 11 Transparency 11-2, and Work and Energy: Springs. We were to complete them so that we could go over them on Friday.

Ms. Kozoriz then gave us the rest of the period to work on our labs and the worksheets.

Have an awesome day (:

Nov. 3. 2010

Hey,

So today in class we started with the Transparency 11-3 Worksheet. (the one about Potential Energy and Kinetic Energy)

answers:

1. What type of energy exists in the situation shown?
- Gravitational Potential Energy/ Kinetic Energy

2. How are these two types of energy defined?
-GPE: energy stored in a system as a result of the force of gravity between the object and Earth; Ep=mgh
-Ek: energy of motion; Ek=1/2mv^2

3. At what points is the kinetic energy of the ball at a maximum?
-Just as the ball is thrown up and when it returns to its lowest point, velocity is the greatest at these 2 points.

4. When is gravitational potential energy at a maximum?
-At the top of its trajectory; Gravitational Energy is proportional to the height of an object above Earth's surface

5. As the gravitaional potential energy increases, how does the kinetic energy change? Is this an example of an open or a closed system?
-Kinetic Energy decreases; closed system

6. How does the sum of the kinetic and gravitational potential energy change? What Principle does this demonstrate?
- Sum stays constant; Law of conservation of Energy

7. How many times during one rise and fall of the ball are the gravitaional potential and kinetic energy equal?
-twice


Next we moved onto the last part of the unit; Force and the Spring

One of the first things we need to use when working with springs is its deformation i.e. how much it stretches from its normal length when a force is added. This will be shown with X

This means that a graph of Force x X will be a straight line
http://www.pa.msu.edu/courses/1998spring/ISP209/homework/hmwk3/Hw03gr.gif

The slope of the graph, (K) can be calculated by k=rise/run=F/X

"K" is a constant called the spring constant and has the dimensions of force per unit length (N/m). "K" is also referred to as the stiffness because the larger the value for "k" the stiffer the spring

It is important to understand that, in the equation F=kx, the Force is coming from something else added to the spring. This means that when the spring is compressed, both X and F are negative (-). When the spring is stretched, bothe are positive (+)

This is explained in Hooke's Law ffor a spring: "The force applied to an ideal spring is given by F=kx where k is the spring constant and x is the displacement of the spring from its unstrained length"
................ for a diagram of the above, click on the link below
http://www.pa.msu.edu/courses/1998spring/ISP209/homework/hmwk3/Hw03gr.gif

Derivations for F=kx

W= area of triangle
W=1/2 Fx
W=1/2 (kx) (x)
=1/2 kx^2

Es=1/2kx^2


We also worked on a lab based on what we just learned, in which we put weights on a spring and measured the displacement and Force exerted. The lab is due tomorrow

If you have any questions, feel free to ask Mrs. Kozoriz

HAVE A GOOD EVENING!!!

Hello Everyone, today we went over the answers of chapter 10 Study Guide page 56 and 57 which are given below;

    

MATCHING:

1. f

2. c

3. a

4. b

5. d

6. e

MCQ'S:

7. a

8. b

9. b

10. a

11. a

12. a

  

For each of the situation shown, write the letter next to the number of the correct expression.

13. B,E,F

14. A,D

15. C

ANSWERS:

16. 30N

17. 0.5m

18. work done

19. 3J

MATCH THE FOLLOWING:

20. a 

21. c

22. e

23. b

24. d

         Those who were absent on Thursday did the lab and the other students were working on chapter 10 Transparency 10-1 (Force, Work and Distance). Ms.Kozoriz helped us solving those questions, the answers are;

1. 150N

2. 8.0m

3. 0-150N as force increases the object moves 3.0m. Between 3-6m a constant of 150N is applied to object. For last 4m force is upward from 150N to 250N.

4. w=f.d

5. w=f.d

w=150N.2m

w=300N.m(J)

          Then Ms.Kzoriz gave us a helpful lecture on Kinetic Energy and Gravitational Potentional Energy. After we performed an experiment on Conservation Of Energy with 3 balls of different sizes and a meterstick. We also get a chapter 11 Transparency11-3 Worksheet in which we have to answer 7 questions.

                      Thats all we did today and also we handed in our lab worksheet on work and power. Unfortunately, tomorrow we dont have a Physics period because its half day. 

                                                                                                              Have a great day,

                                                                                                              Nageena.