# Energy Basics

You should be well-grounded in the basics of energy. Here is all the theory you are responsible for at this point:

What is work? The cosine term in the equation is not strictly necessary as long as you understand the force to be in the direction of motion.

https://www.flippingphysics.com/work-intro.html

Kinetic energy:

https://www.flippingphysics.com/intro-ke.html

Gravitational potential energy:

https://www.flippingphysics.com/intro-peg.html

Elastic potential energy: (from a compressed spring)

https://www.flippingphysics.com/intro-pee.html

Energy is conserved:

https://www.flippingphysics.com/intro-coe.html

Please note that his approach to energy problems involves a LOT of writing as all forms of energy – even ones that don’t exist at a given time – are written out. We won’t usually do this in class but focus on the CHANGE in energy.