Work Done by a Varying Force

This topic is very difficult to get into a Powerpoint, so unfortunately I don't have one. Instead we used the whiteboard:

What you really need to know is this:

The work done by a variable force acting on an object that undergoes a displacement is equal to the area under the graph of F_x vs. x. 

So, graph F_x vs. x and find the area under the graph to find the work done by that force.

We practiced this with a ranking task, then we started working on homework problems.

Homework is Chapter 5 (p. 163) Problems #59, 60, 61.