Goals
1. Learn to draw vector components using the tip-to-tail method.
2. Evaluate the sum of two or more vectors in two dimensions graphically
3. Determine the components of the vectors
4. Solve for the sum of two or more vectors algebraically by adding the components of the vectors.
Warm-Up
1. Sign up for the Remind App. I'll be using it this semester to remind you of upcoming assignments and opportunities. Here's the link: https://www.remind.com/join/7a9c29
If you earned a B or higher last semester, the signing up for reminders is optional. If you earned a C or lower, it's mandatory.
2. In your warm up sheet, write the date, and complete the following:
a. What was your grade percentage for the Written portion of the test?
b. What was your grade percentage for the Multiple Choice portion of the test?
(Keep in mind, A=100-90%, B=89-80%, C=79-70%, D=69-60%, F=<59%)
c. Did you do well on either of the tests? Why or why not?
(the class average on the written test was 34%; on the multiple choice it was 53%)
Classwork
1. Vectors Revisited: Imagine you and a friend are pushing a car directly west. You push with a force of 40N, and your friend pushes with a force of 55N. What is the net force (magnitude and direction).
2. Vectors in Multiple Dimensions: An ant leaves home (the origin), walks 12cm due east, then turns and walk 8cm due south. Using a ruler. sketch the two displacement vectors, put them tip-to-tail as shown on CH5 page 120 (in the margin), and then find the ant's resulting distance from the origin using two methods:
A. calculate the resultant using the Pythagorean Theorem
B. measure the resultant using a ruler
3. Read pages 119-120. In your group, create four reading quiz questions for the section. You have 10 minutes.
4. Notes: Introductory Tip-to-Tail Vector Addition Problem. If you have questions, raise your hand and I'll pause the video
Check your notes here: http://www.flippingphysics.com/uploads/2/1/1/0/21103672/0050_lecture_notes_-_introductory_tip-to-tail_vector_addition_problem.pdf
5. Practice Problems pg 121 1-3
6. Notes: Introduction to Vector Components. If you have questions, raise your hand and I'll pause the video
Check your notes here: http://www.flippingphysics.com/uploads/2/1/1/0/21103672/0052_lecture_notes_-_introduction_to_vector_components.pdf
7. Practice Problems pg 125 5-7
8. Connect activities with goals
***Need help with Cardinal Directions?***
Go here --> How to use Cardinal Directions with Vectors
Homework
Test Corrections.
Fix all your errors.
I will post the test and answers here
Goals: SWBAT...
1. Recognize that the vertical and horizontal motions of a projectile are independent.
2. Relate the height, time in the air, and initial vertical velocity of a projectile using its vertical motion, and then determine the range using the horizontal motion.
3. Calculate distance traveled, flight time, and max height using a variety of data
WARM-UP & HW Check
You accidentally throw your car keys horizontally at 8.0 m/s from a cliff 64-m high. How far from the base of the cliff should you look for the keys?
CLASSWORK: (for each CW activity, think about which goal you are meeting. Also, tell me how the activity helps you achieve that goal)
1. Review 33, 34, 35 (https://www.youtube.com/watch?v=_c-vJ9gVJm0)
2. "Over the Edge" Quick Lab (I'll do this Thurs as a quick demo)
A. Predict which ball will hit the floor first when you roll one battery horizontally off the surface of your table, and simultaneously let the other battery free-fall from the edge.
B. Explain your prediction.
C. Test your predictions. Obtain two AA batteries, and two stopwatches (phones). Take five trials. Record data in a simple chart.
Analyze and Conclude
D. Does the horizontal velocity of the battery affect its vertical velocity?
3. Review pg 150: 1, 2, 3; pg 164: 40, 41, 43
4. PRACTICE: Solve pg 165: #52 & 53
HOMEWORK:
Due Tuesday:
1. Read "Projectiles Launched at an Angle" pg 150, and Example Problem #1 pg 151
Answer the following:
A. In figure 6-3a, what is similar between the upward and downward vertical velocities?
B. What is different?
C. In figure 6-3b, what is the vertical velocity at the max height of the projectile?
D. What statement can you make about the horizontal velocity in both 6-3a and 6-3b?
2. Solve pg 152 #7, 8, #11 is extra credit
Solve pg 164 #44
Solve pg 165 #52, 53
Ignore the below:
6. EXAMPLE Problem #1 (pg 151)
7. PRACTICE: pg 152 # 4, 5
8. Fall Final Exam corrections
HOMEWORK:
Due Wednesday: Read 153-156. Reading Quiz Wednesday.
Solve pg 152 # 7, 8, #11 is extra credit
Solve pg 164 # 44