April 28, 2011

At the beginning of the class, we continue reading on page 17, Sound Quality. We learned that the sounds made by the human voice and musical instruments are much more complex and sound differently even though some instruments give off the same frequency. In musical terms, the difference between the two waves is called the timbre(TAM-bər), tone colour or tone quality. We also learned that the "Middle-C" on a piano has a frequency of 261.63Hz, but on the Just Scale system, middle C has a frequency of 256, this is what we are going to use.

Diatonic Scale consists of three major triads.

Major Triad is a collection of three notes with frequency in the ration of 4:5:6. If you want to know the frequency of E or G note, you just have to use the ratio between notes (e.i. C note is 256, then the frequency of E note is (5/4)(256) which is 320Hz).

Octave consists of interval between a given musical tone and one with double or half the frequency.

We finished reading pages 17-19 and if you want to know some important definitions and summarization of the whole booklet, go to pages 22-23. Finished correcting the homeworks given to use yesterday.

I think that's all, anyways be ready for the TEST NEXT WEEK and ENJOY your long weekend!

P.S. Anyone wants to scribe for Monday, May 2nd?

April 27, 2011

For today's class, Ms. K gave us the time to finish up the lab activity involving the speed of sound. We also checked the homework from pages 26-27 (#10-16) of the Sound Unit booklet.
Grade 11 Physics: Unit 1.3 Sound and page 26 #17-20 will be check the next day.

Just a reminder that the lab is due on the day of our test, which is next week, Monday (i'm not sure if that is the date). The whole booklet will be handed-in that day.

I forgot to scribed for this day so i am going to work double shifts. haha.

March 3, 2011 - Force and Acceleration Lab

For today's class, we started off by doing the lab or experiment about force and acceleration. As we have learned yesterday from the video by Paul Hewitt about Newton's first law of motion, which states that "when no net external force is acting on an object it will either remain at rest or, if it is moving, it will continue to move in a straight line at constant velocity". We will have to apply what we've learned from recent lessons for this lab.

We started the lab by preparing the equipments needed such as laboratory cart, recording timer, carbon paper discs, pulley, large paper clip, washers, and heavy strings. After that we follow the procedures in the lab handout(if you don't have one, please ask Ms. K for a copy). Make a data table, record your results, sketch a graph for your results and I think we have to answer the Interpretation in the worksheet. Don't worry, Ms. K told us that we still have some class time to finish the lab for tomorrow.

Definition:

Tock - is the distance between two consecutive numbered dots represents one time interval.

Things to remember:

          1. Test the sys. to see if you have offset friction. (Hint: put enough washers on big paperclip to offset friction)

          2. Label 5 tapes as 50g, 100g, 150g, 200g and 250g. Tapes should measure 1.0 metre long.

          3.Data table 7 - 1 needs to be extend(1-16) for tape 1 and 2. This means you need more than 10 entries for 2 tapes.

I think that's all, the one who will scribe for tomorrow's class is Keinaan94.