Chad provides a lesson on Work. He begins by providing the definition of work in a physics context and providing the formula for work. Simply put, it is force times displacement, at least in one dimension. It is a little more complicated in 2dimensions (or even 3dimensions) as the angle between the force and displacement has to be accounted for. Chad also explains how work is positive when force and displacement are in the same direction, but negative when they are in opposite directions. The Joule is the SI unit of both work and energy and Chad shows how to derive what the Joule is equal to in terms of base SI units.

The rest of the lesson is then devoted to demonstrating how to solve physics work practice problems, both work numerical problems and work word problems. The first is a simple 1dimensional physics work problem. The second is a physics work problem involving pulleys which demonstrates that while the mechanical advantage of a pulley generally lowers the force required to move an object, it does not affect the work required to move it. The last two problems involve calculating the work required to pull an object across a surface with friction. In the first case the pulling force is in the same direction as the displacement. The second problem is a little more challenging as the pulling force is oriented 30 degrees from the direction of the displacement, but Chad demonstrates how to properly set up the free body diagram and the net force equations in order to solve for the work done by the pulling force and the work done by friction.

00:00 Lesson Introduction
00:45 Definition of Work in Physics and Formula
01:21 SI Unit of Work and Energy is the Joule
05:53 1Dimensional Work Problem
08:40 Work with Pulleys Problem
13:47 How to Calculate Work Done by Friction (Positive vs Negative Work)
17:53 How to Calculate Work Done by Friction (2Dimensional Problem)

Check out Chad's General Physics Master Course: https://courses.chadsprep.com/courses...