Energy and the Dynamic Earth

fingerprints

2009-06-03T18:09:00.000-07:00

Fingerprints:
http://sciencespot.net/Pages/classforsci.html#fiingerprint

worksheet 1

worksheet 2

YOUR PRINTS

Innovation truck visit

2009-06-02T21:30:00.003-07:00

http://www.youtube.com/watch?v=u6ep2IRMObA

Innovation

2009-06-02T21:30:00.001-07:00

Rain Barrel PPT

2009-05-17T19:06:00.000-07:00

Rain Barrel PPT

Savonius Model

2009-05-17T18:39:00.000-07:00

Ain't that Cute!

2009-04-16T22:19:00.001-07:00

More Wind Turbine Stuff

2009-04-16T15:41:00.000-07:00

The most promising plan I've seen

Google sketch up of a wind turbine with bike wheels http://sketchup.google.com/3dwarehouse/details?mid=ee406b7ce475f31cdc50d5f0db487aac

Making stuff on the cheep

Other Generators (not wind)

Wind Turbines

2009-04-05T18:50:00.001-07:00

Not all wind turbines are the same!
(SOME ARE JUST WIERD LOOKIN'!)
We'll be looking at form and function this week in class.

Below see a link how a school in Mozambique made wind turbines to run radios, charge batteries, and otherwise increase folks connectivity with electricity.

http://images.google.com/imgres?imgurl=http://photos18.flickr.com/23968250_f1e5314383.jpg&imgrefurl=http://museumtechnologymozambique.blogspot.com/2008_09_01_archive.html&usg=__qPasX-cKaALTV5bhnpq4At0TUoA=&h=307&w=354&sz=23&hl=en&start=37&sig2=aIwnBOm8EIux6b-xog1eGQ&um=1&tbnid=hfgDv9Cn3byKXM:&tbnh=105&tbnw=121&prev=/images%3Fq%3Dinternal%2Bworkings%2Bwindmill%26ndsp%3D20%26hl%3Den%26client%3Dfirefox-a%26rls%3Dorg.mozilla:en-US:official%26sa%3DN%26start%3D20%26um%3D1&ei=Nl7ZSfK9LKaAtgP8pqW2Cg

Mnemonic devices

2009-03-18T22:27:00.000-07:00

Mnemonic devices are ways to remember long lists... such as ROYGBIV (Red Orange Yellow Green Blue Indigo Violet)

and the latest written by B4 Energy and Dynamics (RMIVUXG) Radio Micro Infrared Visible Light Ultraviolet X-ray and Gamma (recently my ipod vanished under xavier's G-string).

Don't forget wavelength and frequency are inversely proportionate.

Eye getting knocked out

2009-03-18T22:26:00.000-07:00

it's true..
an eye can get popped out. Here is the famous basketball game:

http://www.youtube.com/watch?v=6DXWwa1iT-s

Stopping Traffic

2009-03-01T14:34:00.001-08:00

Optical Illusion Assignment

2009-03-01T13:14:00.000-08:00

Though some of you are done, I want to remind all of you your assignment parameters are:

Find an optical illusion. Print and cut it out. Classify the type. Tell us how it works. Write that information on an index card. Put both on a piece of construction paper and put on the wall in the classroom.

Classify the type of optical illusion (Physiological (Hermann Grid and Mach Band examples), Conceptual (Kanizsa's Triangle), or Cognitive illusions. Conceptual and cognitive images are often confused. What is most important to know for our class is the difference between a conceptual (brain interpretation) "mistake" and a physical (afterimage, parallel line skewed by color) eye or nerve "mistake".

What does this have to do with physics and earth science? Light, my friends, is how you are reading this. Human's ability to understand it and grasp it are dynamic and everchanging. Al Sheckel, winner of the Nobel Prize in Physics, did most of his research on perception. He is an amazing, truant, dynamic, brilliant, and odd man. His work on perception, light, and the human brain is ground breaking. He's also one of the folks on the edge of edgy in terms of "the brain trust" an inventors group and other very cool things. He also came up with the darwin bumper sticker with a friend. If that isn't cool I don't know what is.

The Eye

2009-03-01T13:10:00.000-08:00

We are currently studying the eye. Here is a diagram of the eye. The parts of the eye are underneath.

Cornea - the clear, dome-shaped tissue covering the front of the eye.
Eyebrow - a patch of dense hair located above the eye.
Eyelash - one of the many hairs on the edge of the eyelids.
Eyelid - the flap of skin that can cover and protect the eye.
Iris - the colored part of the eye - it controls the amount of light that enters the eye by changing the size of the pupil.
Lens - a crystalline structure located just behind the iris - it focuses light onto the retina.
Optic nerve - the nerve that transmits electrical impulses from the retina to the brain.
Pupil - the opening in the center of the iris- it changes size as the amount of light changes (the more light, the smaller the hole).
Retina - sensory tissue that lines the back of the eye. It contains millions of photoreceptors (rods and cones) that convert light rays into electrical impulses that are relayed to the brain via the optic nerve.
Tear - clear, salty liquid that is produced by glands in the eyes.
Vitreous - a thick, transparent liquid that fills the center of the eye - it is mostly water and gives the eye its form and shape (also called the vitreous humor).

Flame Tube

2009-02-22T18:06:00.000-08:00

Here is a demonstration of a student playing flute into a flame tube: on youtube

It is a wonderful demonstration. Maybe by the next time I teach this I'll be able to buy a frequency generator!!!

When is loud too loud?

2009-02-16T19:24:00.001-08:00

Apple iPod being sued over hearing damage

Supersonic

2009-02-16T18:59:00.000-08:00

Above picture is of a jet cracking the sound barrier:

The term supersonic is used to define a speed that is over the speed of sound (Mach 1). At a typical temperature like 21 °C (70 °F), the threshold value required for an object to be traveling at a supersonic speed is approximately 344 m/s, (1,129 ft/s, 761 mph or 1,238 km/h). Speeds greater than 5 times the speed of sound are often referred to as hypersonic. Speeds where only some parts of the air around an object (such as the ends of rotor blades) reach supersonic speeds are labeled transonic (typically somewhere between Mach 0.8 and Mach 1.2).

Sounds are travelling vibrations (pressure waves) in an elastic medium. In gases sound travels longitudinally at different speeds, mostly depending on the molecular mass and temperature of the gas; (pressure has little effect).

New Sesmester, New Topics

2009-02-16T18:40:00.000-08:00

Hello, a new semester and new topics.

Waves:

Vocabulary waves: frequency, wavelength, amplitude, trough, crest, compressional wave, transverse wave, and more.

Objectives: Be able to differentiate compressional and transverse waves.
Be able to label a picture like that above.

Sound:

Vocabulary sound: decibels (dBs), compressional wave, ultrasound technology, compression and rarefraction, resonance, pitch, frequency, and more.

Objectives:
Know what raising the amplitude of a wave will have an affect on the sound.
Know what increasing the size of the wavelength does to the sound we hear.
Know the decibel scale and what levels do damage to a person's hearing.
Describe hat is going on with the changes made in the flame waves in the roubins tube

Human ear: Be able to identify all the parts below: (stirrup, anvil, ear, eustacian tube, pinna, cochlea, eardrum, nerve cords, outer ear canal

Practice Final

2009-01-19T09:39:00.000-08:00

Pre-Test for the Final Name: ________________________

Do your best to read through the following questions, answer them, and then check your answer. If you do not see how to answer them please come to a study session.

1. Complete the following:
82 kg = ___ g
A. 8.2 g
B. 820 g
C. 8200 g
D. 82,000 g

2. An automobile would best weighed in ___
A. milligrams
B. grams
C. kilograms
D. meters

3. Complete the following:
35 g = ___ mg
A. 35,000 mg
B. 3,500 mg
C. 350 mg
D. 0.35 mg

4. Which of the following would best be measured in grams?
A. A plane
B. A box of tissues
C. A truck
D. An elephant

5. A bag of flour holds 2 kg of flour. How many grams is that?
A. 1250 g
B. 2000 g
C. 250 g
D. 50 g

6. Complete the following statement:
9,345 g = ___ kg
A. 934.5 kg
B. 93.45 kg
C. 9.345 kg
D. 0.09345 kg
7. Which of the following would best measured in milligrams?
A. A vitamin
B. A dictionary
C. A laptop computer
D. A bag of sugar

8. In general, the acceleration of objects due to the earth's gravitational pull is
(A) 70 mph
(B) 30 g
(C) larger if the object is further away
(D) 9.8 meter per second squared

9. A raindrop on a drizzly day takes 30 minutes from the time it leaves the cloud until it hits your umbrella, 5 miles below The average velocity of the raindrop on its journey is
(A) 3 miles/hr
(B) 10 miles/hr
(C) 15 miles/hr
(D) Impossible to determine because the raindrop accelerates due to gravity
(E) None of he above

10. A car traveling at constant velocity v of 20 miles per hour drives for 6 hours. How far did it go?

(A) 3 miles
(B) 100 miles
(C) 120 miles
(D) 150 miles
(E) None of the above

11. If a running cockroach traveling at a speed of 6 cm/s, and experienced a rapid of deceleration to zero in 1 s, what is the acceleration?
(A) -1 cm/s
(B) -1 cm/s2
(C) -0.1 cm/s2
(D) -6 cm/s
(E) -6 cm/s2

12. How does 2.067 x 1011 look when written out in standard notation.
(A) 206700000000
(B) 206700000
(C) 2067000
(D) 206700000000000

13. Which unit should you use to measure length of a paper clip?
A. millimeter
B. megameter
C. decimeter
D. meter
E. kilometer

14. Which unit should you use to measure the distance to the North Pole?
A. millimeter
B. centimeter
C. decimeter
D. meter
E. kilometer

15. Work = Force x distance. If I lift 10kg of mass 2 meters high how much work have I done? Force = ma (mass x acceleration) Acceleration due to gravity = 9.8m/s2
A. 20 Newtons
B. 60 Joules
C. 196 Joules
D. 20 meters

16. Which unit should you use to measure the length the playground?
A. millimeter
B. centimeter
C. decimeter
D. meter
E. kilometer
17. Which unit should you use to measure the height
of a box of cereal?
A. megameter
B. centimeter
C. decimeter
D. meter
E. kilometer

18. What is the Force of a 500 kg car hitting a fire hydrant at 2 m/s2
(A) -2000 N
(B) -1 cm/s2
(C) -0.1 cm/s2
(D) -6 cm/s
(E) -6 cm/s2

19. Which unit should you use to measure distance from New York to Los Angles?
A. millimeter
B. centimeter
C. decimeter
D. meter
E. kilometer

20. Which unit should you use to measure distance a car travels in one hour?
A. millimeter
B. centimeter
C. decimeter
D. meter
E. kilometer

21. Which unit should you use to measure the length of a cat's tail?
A. millimeter
B. centimeter
C. decimeter
D. meter
E. kilometer

22. How does 4.305 x 10-7 look when written out in standard notation.
(A) 0.0000004305
(B) 0.00000004305
(C) 43050000000
(D) 43050000

23. How does 40500000 look when written out in standard notation.
(A) 4.05 x 10-7
(B) 4.05 x 107
(C) 4.05 x 1010
(D) 4.05 x 105

24. How does 12,000,000,000,000 look when written out in standard notation.
(A) 1.2 x 1013
(B) 1.2 x 1012
(C) 1.2 x 1010
(D) 1.2 x 10-13

25. If a grocery cart is driven at 1 meter every 30 seconds, how far will it go in 60 seconds?
A. 0.5 meters
B. 2 meters
C. 5 meters
D. 20 meters

26. If a grocery cart is driven at 1 meter every 10 seconds how far will it be in 2 minutes?
A. 3 meters
B. 6 meters
C. 12 meters
D. 50 meters

27. If I drive to ducks game in Eugene, which is 110 miles away, at a rate of 55 miles an hour and don’t stop…. How long does it take me?
A. One Hour
B. Two Hours
C. 3 hours
D. 4 hours

28. Newton wrote three laws of motion. Which is not any of them?
a. For every action there is an equal or opposite reaction
Subject of experiment Volume of water (mL) Temp
erature change Mass change Calories in system Calories per gram
Peanut 100 mL 46 2.0g

Potato chip 100 mL 33 3.0g
Marsh
Mellow
100mL 50 2.5g
b. An object in motion remains in motion until disturbed by an outside force. An object at rest will remain at rest until disturbed by an outside force.
c. Force = mass x acceleration
d. Energy cannot be created or destroyed.

29. If I drive to my conference in San Diego it would be 1100 miles. How long will it take me if I drive 55 mph. (about)
A. 10 hours
B. 20 hours
C. 30 hours
D. 40 hours

30. If our next campout is in the Gorge, at Horse Thief Lake, 90 miles away. How long would it take us to get there if we drove 40 miles an hour?
A. One hour
B. Two hours
C. Two hours and 15 minutes
D. Two hours and 10 minutes

31. If I lift a 10 kg box 10 meters, how much work have I done? Work = Force x distance, F = ma, a due to gravity is 9.8 m/s2
a. 98 Newtons
b. 980 Joules
c. 10 Newtons
d. 10 Joules

32. If I walk up a set of stairs, going a total of 5 meters, and I weigh 100 kg. How much work do I do?
A. 4900 Joules
B. 49000 Joules
C. 490 Newtons
D. 49 Newtons

33. If I run up a set of stairs in 15 seconds, at 10 meters high, with a weight of 100 lbs, how much power do I use?
A. 65.3 W
B. 653 W
C. 210 W
D. 137 W

34. Which of the following is Newton’s 2nd Law
a. For every action there is an equal or opposite reaction
b. An object in motion remains in motion until disturbed by an outside force. An object at rest will remain at rest until disturbed by an outside force.
c. Force = mass x acceleration
d. Energy cannot be created or destroyed.

In a calorimetry experiment students tested three different food items. Calculate the calories of each of the following?

36. How many calories are in one gram of peanut?
a. 461000 calories/gram
b. 4600 calories/gram
c. 23500 calories/gram
d. 2300 calories/gram

37. How many calories per gram of marshmallow?___________.
a. 25 calories/gram
b. 2500 calories/gram
c. 25000 calories/gram
d. 200 calories/gram

38. If I lift a 10 kg box 3 meters in 2 seconds, how much power did I use? Work = Force x distance, F = ma, a due to gravity is 9.8 m/s2. Power = Work/time
a. 15 Watts
b. 98 Joules
c. 10 Newtons
d. 73.5 Watts

39. A paper delivery girl takes 5 minutes to deliver to 20 houses. How long does it take her to deliver to 100 houses?
a. 5 minutes
b. 10 minutes
c. 15 minutes
d. 20 minutes
e. 25 minutes

40. A mail truck takes 20 seconds to move between mailboxes that are 10 meters apart. What is his speed ?
a. 200 m/s
b. 0.5 m/s
c. 2 m/s
d. 0.5 m/s
e. 0.2 m/s

41. A person in a head-on car collision, who is not wearing a seat belt, continues to move forward at the original speed of the car because of which phenomenon.
a. friction
b. inertia
c. gravity
d. acceleration
e. velocity

42. Which one of the following values would be speed? a. 5 meters
b. 100 grams
c. 7 seconds
d. 10 km/hr
e. 20m/s2

43. Velocity (speed) = d/t. If time decreases does the speed increase or decrease?
A. Increase
B. Decrease
C. None of the above
D. Both A and B

44. When a force is exerted on a box, an equal and opposite force is exerted by the box.
Who wrote the three laws of motion that explain this and the other two laws of motion?
a. Albert Einstein
b. Linus Pauling
c. Isaac Newton
d. Marie Curie

45. Momentum = mass x volume. Which has a higher momentum?
a. 10 kg cannon ball going 1 m/s
b. 1 kg baseball going 90 m/s
c. 500 kg car going 0.2 m/s
d. 63 kg me running at 1 m/s

46. The first step in using the scientific method to solve a problem is to:
a. collect data
b. design the experiment
c. form of hypothesis
d. make a conclusion

47. A snow ball at the top of a hill starts at 0 meters/second, but then accelerates to 3 meters per second. It does this in 10 seconds. What is the acceleration?

a. 5m/s2 b. 0.7 m/s2 c. 0.3 m/s2 d. 30 m/s2

48. A company is testing a new fertilizer. They have two plants. One plant receives the fertilizer being tested, while the second plant receives no fertilizer. In this experiment, the plant that receives no fertilizer is the__________________.
a. dependent variable
b. independent variable
c. control
d. placebo

49. How does 4 x 10-3 look when written out in standard notation.
(A) 0.004
(B) 0.00004
(C) 4000
(D) 4.000

50. Which of the following units is not used as a unit for volume?
a. cm2
b. kg
c. L
d. mL
e. meter

1. (A) (B) (C) (D) (E)
2. (A) (B) (C) (D) (E)
3. (A) (B) (C) (D) (E)
4. (A) (B) (C) (D) (E)
5. (A) (B) (C) (D) (E)
6. (A) (B) (C) (D) (E)
7. (A) (B) (C) (D) (E)
8. (A) (B) (C) (D) (E)
9. (A) (B) (C) (D) (E)
10. (A) (B) (C) (D) (E)
11. (A) (B) (C) (D) (E)
12. (A) (B) (C) (D) (E)
13. (A) (B) (C) (D) (E)
14. (A) (B) (C) (D) (E)
15. (A) (B) (C) (D) (E)
16. (A) (B) (C) (D) (E)
17. (A) (B) (C) (D) (E)
18. (A) (B) (C) (D) (E)
19. (A) (B) (C) (D) (E)
20. (A) (B) (C) (D) (E)
21. (A) (B) (C) (D) (E)
22. (A) (B) (C) (D) (E)
23. (A) (B) (C) (D) (E)
24. (A) (B) (C) (D) (E)
25. (A) (B) (C) (D) (E)
26. (A) (B) (C) (D) (E)
27. (A) (B) (C) (D) (E)
28. (A) (B) (C) (D) (E)
29. (A) (B) (C) (D) (E)
30. (A) (B) (C) (D) (E)
31. (A) (B) (C) (D) (E)
32. (A) (B) (C) (D) (E)
33. (A) (B) (C) (D) (E)
34. (A) (B) (C) (D) (E)
35. (A) (B) (C) (D) (E)
36. (A) (B) (C) (D) (E)
37. (A) (B) (C) (D) (E)
38. (A) (B) (C) (D) (E)
39. (A) (B) (C) (D) (E)
40. (A) (B) (C) (D) (E)
41. (A) (B) (C) (D) (E)
42. (A) (B) (C) (D) (E)
43. (A) (B) (C) (D) (E)
44. (A) (B) (C) (D) (E)
45. (A) (B) (C) (D) (E)
46. (A) (B) (C) (D) (E)
47. (A) (B) (C) (D) (E)
48. (A) (B) (C) (D) (E)
49. (A) (B) (C) (D) (E)
50. (A) (B) (C) (D) (E)

The answers are:
1. D
2. C
3. A
4. B
5. B
6. C
7. A
8. D
9. B
10. C
11. E
12. A
13. A
14. E
15. C
16. D
17. B OR C
18. A
19. E
20. E
21. B
22. A
23. B
24. A
25. B
26. C
27. B
28. D
29. B
30. C
31. B
32. A
33. B
34. C
35.
36. D
37. E. 2000
38. E. 147 WATTS
39. E
40. D
41. B
42. D
43. A
44. C
45. C
46. C
47. C
48. C
49. A
50. E

Study for the Final

2009-01-02T16:35:00.000-08:00

Practice/Study sheet for final:

http://sciencespot.net/Media/speed1.pdf

Tutorial on Power

Tutorial on work

Homework

2008-12-30T08:27:00.000-08:00

Calendar: A DAY Schedule (B-day schedule)

January 5th (6th) 10 minutes of content, Newton’s Laws, Hanging Up Newton’s
Laws Poster, Work on Car, Homework due Jan 7th (not in class,
can be found online:http://trillium678.wikispaces.com/homework

January 7th(8th) Homework due: grade homework together, Work on Car
(homework,pretest)

January 12th(13th) Bring on the Lamps! Car Project EVALUATION January 15th
Movie, Friction and Forces.
Friction lab with your car. (you design: inquiry)

January 19th (20th) Quiz: Newton’s Law:
Continue friction lab (scientific inquiry, CIM work sample)
Document a hypothesis before you start with the stopwatches

January 21st (22nd) Lab write up; class “visits” the rubric, (22nd)

January 26th (27th) Cumulative Final (29th)

January 28th (29th) Groups present their inquiry lab.

Snow Day Problem Set

2008-12-16T18:53:00.000-08:00

Snow Day Problem Set:
Problems from Stair Lab

1. A 100 lb (2.12 lbs = 1kg) man climbs up the stairs slowly, it takes him 200 seconds to climb 4 meters worth of stairs.
a. How much work does he do? (show your work, use units)
b. How much power does it take?(show your work, use units)

2. A 212 lb woman climbs up the stairs quickly. She climbs the 5 meters worth of stairs in 10 seconds.
a. How much work does she do? (show your work, use units)
b. How much power does it take? (show your work, use units)

Problems from Peanut Lab
3. A 2 gram peanut was lit and heated 100g of water. The water started at 20 degrees celsius. The water ended at 40 degrees celsius. The peanut was 1.5 grams after being weighed at the end of the experiment. How many Calories were in each gram of peanut.

4. A honey roasted peanut was lit and heated .05 L of water. The water, initially 25 degrees celsius, was 100 degrees celsius (boiling!!) at the end. The honey roasted peanut weighed 3.0grams at the beginning of the experiment, and 5 minutes later, after it had cooled down, it weighed 1.2 grams. How many Calories are in a honey roasted peanut.

Peanut Lab

2008-12-01T22:42:00.000-08:00

PEANUT LAB:
Heat the water. A calorie is the amount of work it takes to heat 1 gram (or 1 mL) of water 1 degree celsius. We will be conducting this lab:

The unit calorie has historically been used in two major alternate definitions that differ by a factor of 1000:

* The small calorie, gram calorie, or calorie (symbol: cal) is the amount of heat (energy) required to raise the temperature of one gram of water by 1 °C.

* The large calorie, kilogram calorie, kilocalorie (symbol: kcal), or Calorie (capital C) is the amount of heat (energy) needed to increase the temperature of one kg of water by 1 °C, exactly 1000 small calories, or about 4.184 kJ.

See a video explaning the lab here: http://www.youtube.com/watch?v=BhaZnQ1EpQo

Peanut lab printout

Alternative to lab printout

Stair Lab Post Lab Questions

2008-11-28T12:47:00.000-08:00

Stair Lab Post Lab Questions
Purpose
• To determine the work and power required to climb one floor stairs.
• To determine the energy burned during that exercise

Curriculum
We examined three physical quantities: Force, Work, and Power and related units of measure. Newtons, Joules, Watts, and soon to come… calories.
One of the most important concepts in science is energy. Our universe is made of matter and energy. Matter is substance and energy moves the substance. The concept of matter is easy to comprehend, because we can see, feel, smell, or measure it. Energy, on the other hand is very abstract concept, we can’t see, feel, or smell it. But fortunately we can measure it. There are a number of units used to measure energy. A non metric unit of calorie (cal) is one of them. The energy equal to 1 calorie is defined as the amount of heat required to raise the temperature of one gram of water from 14.5oC to 15.5oC. When we work with nutritional values and food, a unit of Calories (Cal - capitol C) is used. Relation between cal and Cal is:
1 Cal = 1000 cal
Metric unit for energy is Joule (J). The energy of 1 Joule is equal to amount of heat needed to rise the temperature of 1 g of water for 1 oC. The relation between the three mentioned units is:
1 Cal = 1000 cal
1 cal = 4.19 J
1 Cal = 4190 J
When we lift the load against the earth’s gravity, work is done on the mass. The more mass on the load or the higher we lift the load, the more work is done. Every time when force is applied and something has moved because of that force, some work is done. Work is defined a as product of force and distance.
W = F d
If we lift 20 kg one story up, we perform twice as much work compared to lifting only 10 kg load, because twice as much force is needed to lift 20 kg. The unit of measurement of work is combination of unit of force N and unit of distance m: Nm which is also called Joule J.
Work can be done at various rates, or energy can be changed at various rates. In some situations happens faster in some others it happened slower. You can walk up stairs or you can run upstairs in one floor. In both cases you are doing same work but at different rates. The rate at which the energy is changed, or work is done is called Power P. P = work done/ time interval. The unit of power is: Joule/second = Watt (J/s = W)

Post Lab Questions
1.) Two people of the same mass climb the same flight of stairs. Myles climbs the stairs in 25 seconds. Ann person takes 35 seconds. Which person does the most work? Which person expends the most power? Explain your answers.
2.) A box that weighs 1000 Newtons is lifted a distance of 20.0 meters straight up by a rope and pulley system. The work is done in 10.0 seconds. What is the power developed in watts and kilowatts?
3.) A person of mass 64 kg climbs up a ladder to a height of 5.0 meters.
a.) What work does the person do?
b.) What is the increase in the gravitational potential energy of the person at this height?
c.) Where does the energy come from to cause this increase in P.E. (Potential Energy).
4. Which requires more work: lifting a 50 kg box vertically for distance of 2 m, or lifting a 25 kg box vertically for a distance of 4 meters?
Which requires more work: lifting a 50 kg box vertically for distance of 2 m, or lifting a 25 kg box vertically for a distance of 4 meters.

Momentum, Work, and Energy: Class Reading

2008-11-27T22:16:00.000-08:00

Class Reading Assignment: http://galileoandeinstein.physics.virginia.edu/lectures/momentum.html

Force and Mass Tutorials. Read through for background

2008-11-27T21:32:00.000-08:00

Force: Force and Mass
Force = mass x acceleration:

Force is a function of mass
Work = Force x distance

Power Output of Certain Activities

How this work applies to seatbelt physics

Topic Outline for Test

2008-11-02T11:35:00.001-08:00

tutorials: Velocity, Acceleration, Go here for a variety of problems to download and tutorials to try http://www.physics.uoguelph.ca/~phyjlh/Prob/Problems.html

OUR CLASS TOPICS:Energy and Dynamics Outline:

Metrics: Be able to convert from metric units to other metric units

Examples:

Metric Ruler:
Kilo Hecto Deka 1 deci centi milli

101 km = _________ m .020 g = _______ mg

Scientific Notation:
Gain familiarity going from whole numbers and converting to scientific notation, and reverse.

1.3 x 10-34 = _________________________________________________

2,000,000,000,000,000,000,000 = ________________________________

Velocity: Given any two of three variables, solve for the 3rd. For example:

V = d/t t = d/v d=vt

Jenny runs across the soccer field (40 meters) to score the goal in 30 seconds. She faced and confused 4 defenders with her fast footwork. What was her velocity toward the goal?

V=
D=
T=

I bike for 2 hours My average speed was 9 km/hr. How far did I go?

V=
D=
T=

Acceleration: (change in velocity over time)

I measured my friend with a Doppler radar. He was riding his bike 15 mph and then went down a steep hill. He got to the bottom of the hill in 0.15 hours. By then he was going 30 mph on his bike! What was his acceleration.

Final velocity=
Initial velocity=
Time=
A=

Momentum
A woman walked away from Fred Meyers down interstate avenue with her cart. She had crossed Lombard avenue and hit the button for the crosswalk. She forgot about her cart for a moment and it went racing down the hill. It wrecked into a car and broke a window, crushed the side. This was a huge problem. She left a note on the car and later was sent a form from the owner’s insurance. It asked the speed of the car.

She talked to the owner of the car. He said the mechanic told him the car must have been hit with a momentum of at least 500 kgm/s. Fred Meyers carts are 20 kg. She had bought 30 kg of groceries. How fast was the cart going?

P=
M=
V=

Newton’s Laws:

1. Inertia.. an object at rest remains at rest unless disturbed by an outside force, an object in motion remains at rest unless disturbed by an outside force
2. F = ma
3. For every action there is an equal or opposite reaction

Newton’s Laws problems.
How much force do you exert on our floor?

M= Your mass: ___________ (x 1 kg/2.02lbs) = ___________________ kg

A= -9.8 meters/seconds squared

F=

Solar Car Links

2008-11-02T11:17:00.000-08:00

Solar car made with pretty advanced tools:
(someone works at radio shack) http://www.metacafe.com/watch/1211208/a_solar_powered_toy_car_handmade/

http://dailydiy.com/2008/10/07/building-a-solar-powered-rc-car-2/

How solar cells work:http://science.nasa.gov/headlines/y2002/solarcells.htm

Scientific Notation: How to and another generator

2008-10-25T21:48:00.000-07:00

A couple "how to" pages:

http://members.aol.com/profchm/sci_not.html
http://www.aaamath.com/dec71i-dec2sci.html (if you scroll down this one also has an interactive "try it" section that will give you immediate feedback if they are getting it right or wrong.

A page that generates questions for you to answer:
http://www.edinformatics.com/math_science/scinot6.htm

Links For Online Tutorial

2008-10-04T16:49:00.000-07:00

OnlineTutorial:

Online tutorial link #1: http://science.widener.edu/svb/tutorial/scinotcsn7.html (If you can't get this one to work switch to this one: http://janus.astro.umd.edu/astro/scinote/ same applies, get a parent or two students to sign showing you got to 30 correct).

Online tutorial link #2: http://www.pa.uky.edu/~jeremy/courses/ast-191/applets/scientificdemo.html

Online tutorial link #3:http://www.harcourtschool.com/activity/newton/index.html

Online tutorial link #4 : For the page called Computer Lab:http://jersey.uoregon.edu/vlab/block/Block.html

Example velocity problem, speed of sound:
Speed of Sound at Patton park today is(330 m/s). The temperature change, moisture in the air, medium through which it travels, and other variables affect the speed of sound. Today, though, the speed of sound is stable at 330 m/s. If I am standing at Jeff's house 1 kilometer away. How long does it take for Brian to hear the concert start?

STEP #1

v = 330 m/s
d = 1 km time = distance/velocity or t = d/v
t =

STEP #2

v = 330 m/s
d = 1000 m
t =

STEP #3

time = 1000m/330(m/s)
t = 3.03 seconds

GraphJam

2008-10-02T17:56:00.000-07:00

Hey all, here is a link to that page I showed you all those downloads from:

http://graphjam.com
Thanks I had a fun time singing with fourth period, y'all are the best.

Velocity Experiments

2008-09-27T05:21:00.000-07:00

Assignments will be passed back on Monday. If you haven't finished graphing your slow flyer lab please do that and hand it to me on Monday.

Thanks!
Hope you all enjoyed campout!
Nina

Scientific Notation Tutorial

2008-09-23T22:04:00.001-07:00

LARGE NUMBERS:
Scientific notation is a way of keeping track of very large or really small numbers.

For example, 1.23 x 10¹¹ miles can be written as 123,000,000,000. That is an example of denoting a very large number. A common use of this is writing avagadros number: 6.0221415 × 10²³ An important number in chemistry studies. It is the amount of molecules of any one substance in any gram.

Scientific notation can also assist us by eliminating the need to write so many zeros to describe a very very small number.

For example, 9.9 x 10^-10, which can be written the same as .0000000099. They are the same number. Just written differently.

Here is an explanation, http://www.nyu.edu/pages/mathmol/textbook/scinot.html

or also seen here on your assignment:

http://www.nyu.edu/pages/mathmol/textbook/scinot.html

Links on Metric Tutorials

2008-09-23T21:57:00.000-07:00

Metric system tutorial and explanation (very clear, not much reading)

http://regentsprep.org/Regents/math/meteng/LesMetr.htm

Metric system tutorial, more explanation:

http://www.visionlearning.com/library/module_viewer.php?mid=47

Metric/English Conversions ( a list of resources):

http://regentsprep.org/Regents/math/math-topic.cfm?TopicCode=meteng