Lecture 3: Vectors, Unit Vectors & Projectile Motion (General Physics 1)

Welcome back to General Physics 1 (PHY 317K)! In this third lecture, we expand from one-dimensional motion into two dimensions, building the mathematical foundation you need to tackle projectile motion. We introduce vectors, unit vectors, and the key principle that makes projectile motion problems solvable: treating horizontal and vertical motion independently.
We work through vector addition both graphically and using trigonometry, then introduce the powerful unit vector method that makes adding multiple vectors fast and clean. From there, we connect everything to the physics of projectile motion and derive the equations you'll use to find maximum height, range, and time of flight.

In this video:
Scalars vs. vectors and why the distinction matters in physics
Graphical and trigonometric vector addition using the Pythagorean theorem and SOHCAHTOA
Reading direction notation like "north of east" and "west of north"
Unit vectors (î, ĵ, k̂) and why they make vector math so much easier
Why horizontal and vertical motion are independent of each other
The kinematic equations applied separately to the x and y directions

Whether you're new to vectors or just need to see how they connect to real physics problems, this lecture gives you the tools to confidently move into two-dimensional motion.

Видео Lecture 3: Vectors, Unit Vectors & Projectile Motion (General Physics 1) канала Viranga Perera