Circular Motion/Work and Energy Review

Conservation of Energy

In today's class, we went over the questions that was for homework from the book on p. 237 PROBLEMS #s 1, 2, 6, 8, 13, 14, & 21... If you need the answers, I'll just post them maybe tomorrow. After doing the questions, we watched a video about "Conservation of Energy".

Here are the answers for the questions in the sheet that Ms. K. gave us today...

1. What quantities are conserved?
- energy,momentum,angular momentum

2. If energy is conserved, how are things started and stopped?
- Things are started and stopped by work. (the transfer of energy from one type to another)

3. If energy is conserved, why do muscles get tired?
- Muscles get tired because of work.

4. If energy is conserved, why do weights fall?
- Weights fall because of the work.

5. What formula is used to calculate work?
- The formula used to calculate work is W = mgh

6. What is the role of work?
- The role of work is to transfer energy from one place to another.

7. What symbols are used for potential energy?
- The symbols used for potential energy are u or PE.

8. How is potential energy calculated?
- Potential energy is calculated by using the formula u = mgh

9. Is potential Energy by itself conserved?
- No.

10. Which scientist investigated the concept of energy conservation?
- Galileo Galilei

11. What is the formula for kinetic energy?
- The formula for kinetic energy is K = ½ mv²

12. How are kinetic energy and potential energy related?
- E = u + k = constant (Although the energy changed from kinetic to potential and back again, the total amount of energy stays constant.)

13. Who formally stated the law of conservation of energy?
- James Joule

14. Briefly describe this experiment.
- James was calculating how much mechanical energy can be converted to heat.

15. State the two mechanical forms of energy.
- Potential energy and Kinetic Energy

16. Can mechanical energy be tranformed to heat?
- Yes.

17. Is heat a form of energy or is energy a form of heat?
- Heat is a form of energy.


That will be all for today!


The next scribe will be...

sjdhsd

Physics.........................

We did a lab about Hooke's Law today. We used a spring in a stand and we attached different kinds of masses and we measured and recorded the extension of the spring. Using the data we gathered, we have to do a graph about the relationship of the force and the extension of the spring, then using those information we can solve the problems in the worksheet. Basically, all we did today is the Hooke's Law lab........That's It!!!!........................PEACE!!

Next Scribe is...........................



Kristel

Friday the 13th's Physics Class

Hello guys! As you all remember, we went over some exercises and notes in our class. We did less work because Ms. K was not around but a substitute named Ms. McQueen filled in. As a comment for our substitute, she made our friday's class fulfilled because she covered all of the works Ms. K asked her to do. Anyway, this is the list of all the things we did.

1. Go over 8.3
2. Overhead notes
3. Hand-out sheets- Force and spring and Hooke's law
4. On problems p.237-239
nos. 1, 2, 6, 8, 9, 13, 14, 20, 21

We went over the answers for the concept-development 8.3 sheet. (Click the images to see the content larger)

Then Ms. McQueen discussed the overhead notes. The notes was about the derivation of the equation.



Afterwards, she gave us the hand-outs entitled "Force and the Spring". A little explanation of the sheets was discussed to us. Thereafter, we were told to answer the exercises in the book.

That's all what we did last friday and God bless us all in Physics.

The next scribe is Ian...............

What we did on physics?

ruschev


hi!...hello!.....how are you?....doing great!....so what did you do on Physics today? oh we corrected the review sheets, Miss K gave us last Monday, oh really? yeah! most of the corrections are on the smart board so just go visit Miss K's post and get the right answers. WOW that is so cool! what did you guys do next? she gave us a work sheet before the class is over. oh really? is it for marks? I don't know so you better do it! WAAAAAAHHHH! okei dokie bye! see you! au revoir!

DAPHNE I CHOOSE YOU!!!!!!! WAAAAAH!

Answers to Work Questions

PHYSICS LAB : Down the hill

Hi. everybody!!!
I hope everyone is in good spirit this spirit week!!!
I'm Ricardo your scribe for today!!


What we did in our class today is a lab activity. The lab is all about potential and kinetic energy. The lab activity can be found in the book at page 225.

That's all we do for the whole period. Don't forget to hand-in your lab tommorrow.

To know more about Kinetic and Potential energy, visit this site. click me

The next scribe will be Ruschev...!!!!

That's a lot of "Work!"

Hello everyone this is Manny your scribe for the day.

So we started todays physics class going over the Force Centripetal lab we did before the weekend.

Then we looked over the page 56-57 of the chapter 10 study guide. The answers to those sheets are here below.


Afterwards, those who didn't do the lab on thursday, like me... did. Meanwhile, the others worked on new handed out worksheets.

And that was pretty much everything that happened. Next scribe will be ricardo, and that will be for Wednesday's class as there is an event tomorrow.

Remember to complete the textbook questions mentioned in Mark's scribe post below as we are going to go over it next class.

What We Did In Class =)

This is Mark Bale your next scribe =)

Well we basically just did a quick browse on Work: Defenition and Work Done by a Variable force.

We also went over the study guide, so for those who don't have the words find a classmate who has them.

Half of the class we did a lab which is in your text books on page 204

So your homework for the weekend is to:
-complete page 56 & 57 in your Chapter 10 study guide
-do review concepts problems 1-5 on page 212
-do app. concept problems 1-6 on page 212 - 213

That's all we basically did. For the next scribe I pick Manny to do the next scribe.