June 6, 2011

All we did for today’s class is answered the Review Problemzz on the Board!

Review Problem Answer Key!

1. Opposite attract likes repel

2. 2. Magnet polarizes the object & attracts the electrons of the object

3. - Temporary magnet

- Nail paperclip

- Tiny loops of current within the substance

4. Domain are no longer aligned

5. It unaligns the magnetic domain weakening the strength of the magnet
. . . . . .

6. S-----------------------N
x x x x x x

7. -Aluminum
-Cobalt
-Nickel

8. You cannot isolate them; because the magnetic domains only flow in are directions. This means the domains would remain uncharged even after breaking it in half.

9. To determine the polarity by using the second right hand rule, curl your finger around the loops in the direction of the conventional current, thumb points toward the North Pole of the magnet.

10. Thumbs à Flow of current

Finger à Magnetic field

Palm à direction of force on wire

11. South Pole, because the north of a magnet is attracted to the magnetic South

12. Magnetic declination is the given location between the magnetic North & Geographic South. Also called the angle of declination.

13. An electric Field surrounds a stationary electric charge.
A magnetic field surrounds a moving electric charges as well as an electric field.

14. B = Fb/IL
0.20/0.10*5 = 0.40T

15. F=BI

= (115min)(5.0x10^-5)

= (4.00x10^-2)

= 2.3N

16. FB = ILB

0.040 = (2.0)(0.1) B

B= -20T

17. Magnetic Field = Fb/IL

Fb=BIL = 0.900T x 8.00A x 0.500m = 3.60N

For does PPL who did not show up to Mrs. K class and don’t understand how we got this answers, talk to Mrs. K before the third Period end. Have a nice half day 2morrow. Better to review Magnetism and Electromagnetism 2morrow because Wednesday we have a test for this unit.

Sound Waves

Definition for Today Class’

Resonance - Rhythm with which you push, produce a large amplitude.

Sound of Reflection - the repetition of a sound resulting from reflection of the sound waves. (Echoes)

Sound of Refraction - The turning or bending of any wave, such as a sound wave, when it passes from one medium into another of different optical density.

Forced Vibration — The oscillation of a system under the action of a forcing function. Typically forced vibration occurs at the frequency of the exciting force.

temperature inversion - condition in which the temperature of the atmosphere increases with altitude in contrast to the normal decrease with altitude.

Out of Phase - an unsynchronized of sound

On the beginning of the class Ms K. Hand back our notes that we done yesterday. Ms K. show another video of Paul Hewitt about Sound Wave. On the first scene of the video, Paul talked about how the dolphin communicates to each other. He also talked about which sound will travel fastest, is it in Cold weather or Warm weather? à Paul answer is warm weather, because the air is less dense and also a collision of molecules of air in warm air is greater. Paul Hewwit also talked the gAng about which can you hear well is it Day time or Night time. à Paul answer is Night time, because the sound waves are bent when they travel from cold air into warm air. (Related: Refraction of sound).

Also he demo to the video how does resonance work. Click the link below to view the demo. à http://www.youtube.com/watch?v=zWKiWaiM3Pw&feature=fvwrel

. ‘’ It is not how hard you push the swing it is about the rhythm how you push the swing’’ à(Resonance)

After Paul lecturing to the gAng, he show the video about the Tacoma Narrow bridge that was a tragedy to the Washington people where the Cat fault... kiddingJ. The bridge collapse because the oscillating of the wind into the bridge. After the cat destroyed the bridge the video ended and Ms K gave us some time to finish our lab report but luckily she gave us more time to hand in the lab tomorrow. Ms K asked us to read the booklet page 1-6.

Next Scribe: BryanC.

Newton's 1st Law - Paul Hewitt and Free-Body Diagram for objects on an Inclined Surface.

Definition: For Today Class!

Newton First Law: The law that a particle not subjected to external forces remains at rest or moves with constant speed in a straight line.

Force: Push or Pull.

Inertia: The ability of an object to resist changes in its state of motion is a fundamental property of all matter

Weight: The force that gravity exerts on an object due to its mass [SI unit is the Newton]

Mass: the quantity of matter an object contains [SI unit is the kilogram]

Gravitational force: is an attraction between two objects because of their mass

Friction: A force opposing the relative motion of two objects that are in contact.

We started the class by watching video, the video that Mrs. K wants to show us last week. The title of the video is Newton’s 1^st law by Paul Hewitt. Our task for the class today is to understand the video and Write down 7 interesting that you learned in the video. The summary of the video are about Inertia, force, gravitational force, mass, weight, velocity, and acceleration. Also, from the video they talk about the homework last week on the book Pg.37 # 1. After we done watching video we continue to talk about the free –body diagram for objects on an inclined surface (page 17 # 7 & 8).

Mrs.K wants us to answer the FF.

Page 40 (#8,9,10) the one that we skipped last Monday because we did not study the object on an inclined surface.

Page 41 (#1-8)

Page 42 (#9&10)

Lastly Mrs. K said that be prepare for our First lab tomorrow. Read the worksheet that she gave to us (Force and Acceleration).

Have A Nice Evening Everyone :)

Next Scribe : Da5rkmatter