PHY 125 – Lecture 7 Kinematics in 2 (and 3, but mostly 2) Dimension’s

Published on: Wed Feb 10 2010

This lecture used many pretty Graph’s it may be difficult to recreate.

Ok. So this will have to do. We talked about Vectors which my lovely graph demonstrates. r is a vector it should have a little arrow on it to really demonstrate Vector but I don’t have a character for it. Vectors

Magnitude (Specified by r)
Direction (Specified by θ)
x and y are the components of the vector (and z if 3-D)
→ on top of r means r is a vector
|r| (with arrow on top →) means magnitude of vector r. It is always positive
In polar coordinates, r is a radius.
ScalarShow Magnitude without direction. (Time, Mass, Temperature)

*Those are →’s on top of the “r” Vector Addition Walking from point x to point y will deliver the walker to vector C. Unit Vector

1) Direct along +x axis, read this “I hat”
2) Direct along +y axis, read this “J hat”
3) Direct along +z axis, read this “Z hat”