12-12-08

Today in physics class we planned to:


 * Daily Question
 * Quiz Reminder
 * Components

We stared on by doing the daily question. The question was "Below we see a top view of an airplane being blown off course by wind in various directions. Use the parallelogram rule to show the resulting speed and direction of travel for each case. In which case does the airplane travel fastest across the ground? Slowest?"

The answer for fastest was D. The answer for slowest was C.

After the daily question, Mr. Manning asked the checks of those who ordered the physics' long sleeve or short sleeve shirt. Don't forget: Long sleeve - $9.65 XXL - $10.90 Short sleeve - $6.90 XXL - $8.15 The shirts come in both white and gray.

Next, Mr. Manning began to teach a lesson on Components. To find the information on components, look at page nineteen in your notes.

Page nineteen explains components by using this example:

"In the sample problem we did with Mr.physics swimming across a river, we found that he was traveling at a resultant speed of 2.5 m/s in the fifty-three degree direction. At the same time, we realize that he is still moving across the river at 2.0 m/s and is still being swept downstream at 1.5 m/s. Since the 1.5 m/s at zero degrees and 2.0 m/s at ninety degrees add up (vectorially) to the resultant velocity, we say that they are components of the 2.5 m/s vector. And since they are at right angles to each other, they are called perpendicular components of the 2.5 m/s vector along the North/South and East/West axes."

"Every vector can be broke down into its perpendicular components along the north/South and East/West axis."



After the lesson, Mr. Manning allowed the class to work on our homework, which was page 19-20.

Reminder: The Drawing Vectors Quiz is on Monday. Don't Forget!!