New Blog 4 a New Quarter

The first periodic test is over! That means:
New quarter, project, lessons, assignments, quizzes, tests and a new blog...
What will happen to this quarter?...

The Law of Reflection

The incident, normal, and reflected ray are all in the same plane.
The theta-r (angle of reflection) = theta-i (angle of incidence).

Eye and the Camera

Lens

• bends light rays so that they form a clear image at the back of the eye – on the retina. As the lens is elastic, it can change shape, getting fatter to focus close objects and thinner for distant objects.

Pupil / Aperture

• the entrance of light.

Iris / Diaphragm

• changes the size of the pupil / aperture and allows different amounts of light to enter the eye / camera.

Retina / Film

• produces an image which is sent along the optic nerve for the brain to interpret, rather like developing a camera film.

Choroid / Dark internal Surface

• absorbs excessive light to prevent multiple images formation.

Difference

• their focusing mechanism

-camera changes the distance between the lens and the film.

-the human eye changes the focal length of lens using the ciliary muscles.

Mirror

Two kinds:

1. concave

the image is erect

may produce a real or virtual image

has a positive magnification

object was facing the front of the mirror

2. convex

the image is inverted

always produce virtual image

has a negative magnification

object is place behind the mirror

Loving Physics Day!

What a lucky day in Physics III! I knew that I my parents will not come in the "parents' day" this Friday. In addition, I also knew my score in the Summative Test last Thursday and Friday. Its not a bad score. I really loved this day.

Family Day?!

After two days of testing and two days of refreshment and "reincarnation", we will now know if our parents will come to Masci and meet Mr. Mendoza. Tommorow will be a thrilling day in PhysicsIII. I wonder if I got a high score in the long test.

The Day B4 The Resurection

We had a wonderful day today. We learned about finding the velocity of the train in Mr. MosKiMen's "problem of the day". No tests, no lessons, just solving an exercise. Hope that I will get high in the upcoming test.

Wahoo... physics!

Today is a perfect day in Physics III. We learned about the "intensity of sound". I got perfect in the "quiz" today. Thanks to the people that helped me in solving the problem.

Brigada Linnaeus

Last day was one day we can never forget in Physics... We just checked the papers and clean the whole room... Hoping that this may happen again...

Super brief...

Brief History of Light

• 1000AD- It is considered that light is consisted of tiny particles.
• Newton- Used corpuscles to explain reflection and refraction.
• Huygens- In 1670, he explained many properties of light by proposing light was wave-like.
• Young- In 1865, he stongly supported the wave theory by showing interference.
• Maxwell- In 1865, he proposed that electromagnetic waves travel at the speed of light.
• Planck- Explained light spectrum emitted by hot objects.
• Einstein- Explained the Photoelectric effect.

Test again...

We just discussed the history, properties and nature of light. After the discussion, we had a quiz for the lesson earlier. Most of us got 7 and above.

What's Next?!

We had quizzes about resultant vectors last wednesday and thusday. I don't know what happened at those days but I still remember that I got failed in the two quizzes. Luckily, I am not the only one, the whole Linnaeus failed. Maybe because we are still confused about the lesson. Hope to have a make-up quiz soon.

Vector Addition - Component Method

1. Draw the vectors to be added.
2. Resolve each vector into it's "x" and "y" components.
-Ax = A cosine Ø, and, Ay = A sine Ø, where A is the vector, and Ø is the vector's angle.
3. Sum all the x and y-components to find Rx, and Ry vectors.
4. Recombine Rx and Ry to obtain the resultant vector using the phytagorean theorem

Adding: Graphical

Finding Resultant Vector using Graphical Method:

1. Establish a legend.
2. Measure and draw the vectors using the ruler and protractor.
-Make sure that the vectors are accurate.
4. Connect the first and last vectors' tip and tails .
5. Measure its distance and angle.
6. Convert them to your legend.
7. Label the drawing.

Vectors

Vector- has magnitude and direction

Resultant vector- is the "sum" of several vectors; the effect of the resultant vector is always greater than the effect of its individual components.

Concurrent vectors- it is the act on the same point at the same time

Equilibrant vector- a vector that produces equilibrium; it is equal in magnitude and opposite in direction to the resultant vector

First Day Blog

This is my first post in this blog. I just wanna promise that from this day onward, I will try improve my blog and make it relevant to students and other people.