Other
Montana State University: Line Integrals
A thorough explanation of line integration and how to represent force fields, include graphs and diagrams for visual reference and examples.
OpenStax
Open Stax: Extended Topic : The Four Basic Forces an Introduction
In the following interactive students will begin to understand the four basic forces that underlie the processes in nature.
Science Education Resource Center at Carleton College
Serc: Magnet Attraction
What is a magnet? In this activity, students will investigate magnets and what they attract. They will observe, explore, ask questions, predict outcomes, then discuss and record their findings.
NASA
Nasa: What Is Lift?
A description of how lift is a mechanical force that requires a fluid moving through a solid object and a change in velocity.
Texas Education Agency
Texas Gateway: 4.8 Extended Topic: The Four Basic Forces: An Introduction
By the end of this section, you will be able to understand the four basic forces that underlie the processes in nature: gravitational, electromagnetic, weak nuclear, strong nuclear forces.
Math Graphs
Houghton Mifflin: Math Graphs: Force Field [Pdf]
The practice exercise investigates force fields, closed curves, and work. The resource consists of an enlarged printable version of a force field available in PDF format.