1. Physics 1 – Sept 30, 2016 P3 Challenge –
Add A = 16 N at 80 and B = 24 N at 245 analytically.
Get out 1.3 Practice problems for Homework Check

2. Objectives and Agenda IB 1.3 Vectors Agenda Assignment:
Adding vectors analytically
Agenda
Homework review
Work session
Assignment:
Complete the Vector Darts Lab

3. Adding Vectors Analytically
Add A = 4.0 N at 30 and B = 8.0 N at 135analytically
1) Resolve all vectors into x and y components (Ax = A cos θ, Ay = A sin θ)
2) Add all x components to find resultant x component, Rx
3) Add all y components to find resultant y component, Ry
4) Convert resultant components into magnitude and direction.
𝑹 𝒙 𝟐 + 𝑹 𝒚 𝟐 and 𝒕𝒂𝒏 −𝟏 ( 𝑹 𝒚 𝑹 𝒙 ) , (add 180o if Rx is negative.)
Usually best to organize this information in a table

4. Sample Addition problem
A pack of four Arctic wolves are exerting four different forces upon the carcass of a 500 kg dead polar bear. Wolf one is pulling on the bear with a force of 20 Newtons (N) due north. Wolf two is pulling on the bear with a force of 30 N, 30 degrees north of west. Wolf three is pulling on the bear with a force of 25 N due west, and wolf four is pulling on the bear with a force of 35 N, 10 degrees west of south. Determine the net force acting upon the polar bear and the direction of that force measured north of west.
Add analytically.

5. Exit Slip - Assignment
What is the magnitude and the direction for a vector with components of N east and 72.0 N north?
What’s Due on Friday Sept 29? (Pending assignments to complete.)
Vector dart lab due on Tuesday Oct 4
What’s Next? (How to prepare for the next day)
Read p45-50