12-18


 * December 18, 2008.

Today's Lesson Plan Included:** Graded Daily Question, Review of Last Night's Homework (pg.24-25) and Additionally Practice Problems.

Mr. Manning informed us that depending on how we draw the triangle, you may be solving the problem using a different angle, but the results should still be the same.
 * Daily Question:** A catapult fires a pumpkin at 30 miles/hour in the 130 degree direction. Using trig, calculate how fast the pumpkin was traveling when fired horizontially and vertically.


 * Homework Review (pg. 24 and 25- Vector Problems with Trig Functions):** We then reviewed the homework. Below is an example of how to do one of the problems as well as the correct answers.


 * 1) 1.) 5.16 m/s and 7.37 m/s
 * 2) 2.) 15.39 m/s and 42.3 m/s
 * 3) 3.) 113.3 N and 52.8 N


 * 4.)
 * 1) 5.) 5.46 m/s and 6.51 m/s

After reviewing the homework, Mr. Manning reminded us that we would be having a test tomorrow and that PROTRACTORS ARE NEEDED! After the announcement we had the rest of the period to prepare for the test by doing practice problems on pages 26, 27 and 28. Answers to page 26 (*Note these problems can be done using trig ( with 90 degree angle) or the drawing method :
 * Practice Problems:**
 * 1) 1.) 74.5 m at 323.7 degrees or 216.3 degrees
 * 2) 2.) 39.4 N at 171.8 degrees
 * 3) 3.) 38.1 m/s at 203.2 degrees

Answers to pages 27 and 28 1.) a. Perpendicular to component (vertical) b. parallel to track c. no acceleration

2.) a. As is 1c, there is no component parallel to the direction of motion b. Yes, as in 1b there is a component parallel to the direction of motion 3.) Yes, because there is a component of force parallel to the direction of motion

4.) a. Boat 4 b. Boat 2 or 3 c. Boat 5 d. Boat 1 Below is a picture of the force vectors based on the winds impact on the sails.


 * Homework:** Study for Unit 5B test. The test will include adding and subtracting vectors, max and min resultant and trig functions. The Test will be about 30 points. Good Luck Studying!