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.