## ENERGY FUNDAMENTALS

Mechanics: Description of forces and energies associated with moving objects; a manifestation of forces acting on material objects

Components of Mechanics:

• Mass = measure of a resistance to force; the total number of atoms in some material.
• Velocity = speed and directon of a moving object
• Acceleration = a change in the velocity of an object; an object moving at constant velocity has no acceleration.
• Force = causes an acceleration; a change in velocity is a manifestation of a force being applied to an object. If there are no forces acting on an object there will be no acceleration.

Your intution already has physics knowledge

Real Physics looks like this

Our Version of Physics is more like the following:

1. You can't move a building
2. A train accelerates more slowly than a motorcycle
3. What goes up must come down
4. On the freeway you would rather have a headon collision with a mosquito instead of a semi
5. You get tired after climbing a long flight of stairs

 Newton described mechanics fully in terms of three laws: constant velocity with no forces, F= ma, equal and opposite reactions

Newton's Three Laws:

Let's do an experiment with forces and masses:

What is Energy?

Energy comes in many forms, kinetic, potential (stored), heat, etc. Energy is always conserved. It is not created or destroyed but is just transformed from one form to another.

Energy = FORCE * DISTANCE

Power = Energy/Time
Energy = Power * Time

A kilowatt is a unit of Power

A kilowatt hour is a unit of Energy

Two Main Kinds of Energy