We began our fourth unit today on work, energy, and momentum. Describing motion through energy and energy transfer is a type of physics called Hamiltonian mechanics. Momentum is another quantity used to describe motion and it appears in this unit because, like energy, there is a conservation law that governs the amount of momentum that an object can have.
We started off today with a discussion on work and what it is. In its most general sense, work is defined as energy transfer from one object to another. However in physics it is given a definition more fitting for physics - the product of a force and the displacement an object is moved by that force. We covered some intricacies of the definition of work (slides 1-9) and then we had time to work on Assignment 4.1. We will take this up on Monday.