Using the six simple machines, design a contraption to pop a balloon.

- Your contraption must use all six simple machines twice.

- You must be creative.

- You must detail each of the steps involved in your contraption (i.e. “Step 1: A rock is rolled down a ramp…”)

- You must include calculations for velocity, acceleration, force, pressure, work and power in your contraption’s description.

This thought experiment is worth a total of 10 points.

Here’s the main point of our studies today on Work and Power:

- Newton (kg x m/s2) = Force
- Pascal (n/m2) = Pressure
- Joules (n x m) = Work
- Watt (j/s) = Power

Quiz tomorrow using these formulas.

Let me know if you have any questions!

Due by Thursday 2/4/10 at 8:00am EST…

Tomorrow I’ll be flying to Los Angeles, but you’ll be here at the Day School taking a quiz.

Make sure to bring your book to class. You will need it for the quiz worth 10 points.

Want a sneak peak and/or a headstart?

Here it is.

Good luck! I’ll miss you all (yes, all of you)!!

Thanks to everyone for emailing in your answers to Quiz 8. For those of you who sent them in last night, I did receive them!

I’ll have your grades posted on MyGradeBook.com sometime this evening after I’m done grading (and after the big Asheville Holiday Parade today!)…

Quiz 8: Density, Energy, and Gases
Physical Science 8
November 20, 2009
Mr. Harrelson

It is the year 2024.

You are 28 years old.

You have just finished your doctoral thesis on high energy physics at M.I.T. and have accepted a position at Stanford University where you’ll be teaching graduate level physics and continuing your research on Calabi-Yau manifolds.

Mr. Harrelson is 47 and has been called upon by NASA to travel to the moon for an expedition to search for boron and squirrellium. He must leave the Fall semester early to begin his arduous training. However, he still has Fall exams to give to his students at Spartanburg Day School.

So, Mr. Harrelson gives you a video call and asks you to come give his Fall Exam at Spartanburg Day School to a group of 8th graders…

–

You’re assignment for this quiz is to compile the information you’ve gathered these past 10 days on volume, density, the types of energy and gas laws and come up with two possible exam questions (and their possible answers). You must turn this in at the end of the class session today.

Your grade will be determined on how well I can discover what you’ve learned from our studies of this material.

Here is the Pop-Review Quiz we did in class today (click).

Remember, our 50 POINT test on Chapter 7 is tomorrow!

QUESTION 1
Which is not a type of mixture?
Solution
Colloid
Acid
Suspension

QUESTION 2
Sugar water is an example of a:
suspension
solution
solute
colloid

QUESTION 3
Ammonia is an example of a(n):
acid
base
salt
antacid

QUESTION 4
Acids produce __________ in water.
hydroxide ions
pH scale
solute
hydrogen ions

QUESTION 5
HCl is a common ________.
acid
base
salt
solution

QUESTION 6
Milk is a good example of which type of mixture?
acid
solution
base
colloid
suspension

QUESTION 7
A base produces ____________ in water.
hydroxide ions
salts
hydrogen
hydrogen ions

QUESTION 8
The names of acids normally end in _______.
-ide
-ice
-ixe
-ic

QUESTION 9
When acids react with magnesium, zinc and iron, _________ is produced.
salt
hydrogen gas
hydrogen ions
hydroxide ions

QUESTION 10
Salt is any compound that is made from the __________ of an acid with a base.
solubility
solution
reaction
neutralization
precipitation

Here is the notesheet from today’s class on section 7.3 on acids and bases (click).

Remember, your homework (due Monday) is 7.3 Section Assessment #1-2 on page 241.

1. What is an acid?
2. What are some common acids?
3. Acids taste a certain way… how do they taste and should you use that property to identify acids?
4. What does it mean to say that an acid is corrosive?
5. Which gas forms when an acid reacts with zinc, magnesium or iron?
6. What are the properties of a base?
7. What are three common bases?
8. Please give one safe way to identify a base.
9. What vitamin is an acid?
10. Which acid is used to clean bricks and metals?
11. Why is baking soda used in baking?
12. Drain cleaners are very potent materials. What substance do they contain and is it an acid or base?
13. Which substance is used to make fertilizers?
14. Where is folic acid found?

Also, check your grades over on http://www.mygradebook.com!

Your up-to-date grades for the 2nd quarter are posted over on http://www.mygradebook.com, so head over and see how you currently stand in the class.

You may also want to look at the “Future Assignments” section as there may be a surprise very soon (as in tomorrow)…

Tomorrow in class we’ll have the laptops and take a practice test online!

I’ll have the practice quiz online here first thing in the morning and it will be online afterwards to help you study and prepare for Test 1 (Thursday-Friday).

Start reviewing your notes now!

Today, we took Quiz 5 on Ionic and Covalent Bonds via the http://www.mygradebook.com site. The “retest” will be posted tomorrow morning and you’ll have until tomorrow night (Friday) at midnight to complete that if you’d like.

You can also head over to MyGradeBook and look at your grades and what assignments you’re missing if you haven’t done so already.

Quiz 5 in Word Format

Quiz 5 in PDF Format

Quiz 5 as a Web Page