ENERGY

What is Energy? The ability to do work or cause change It occurs in different forms: –Electrical, chemical, light, mechanical Energy comes in TWO different states…

Potential Energy Stored Energy – This energy may be found: In the position of an object above a specific point

Potential Energy Stored Energy – This energy may be found: In the chemical composition of the object or substance

Potential Energy The food we eat is also potential energy… Why??

Realizing its potential… What happens to that stored potential energy?

Kinetic Energy The other form of energy The energy of motion Most often seen at the molecular or atmoic motions of the particles of matter

Kinetic Energy The larger the mass, the greater the kinetic energy. Velocity also affects the kinetic energy- it causes a greater change than a change in mass. (Velocity, by the way, is the speed and direction an object is moving in)

Forms of Energy Heat energy –Produced by the movement of atoms, ions and molecules –Difference between Heat and Energy?

Mechanical Energy Energy used and by moving machinery or objects doing work

Electrical Energy Movement of electrons

Chemical Energy Energy stored in the chemical bonds of food, fuel or natural gas. Produces other forms of energy

Light Energy Travels through waves A visible form of electromagnetic waves

Laws of Energy Law of Conservation of Energy The First Law of Energy Energy can neither be created nor destroyed.

Laws of Energy This means that the total amount of energy leaving a system is equal to the total amount of energy that entered the system. Law of Conservation of Mass (also known as the Law of conservation of Matter) – Matter can neither be created nor destroyed

Laws of Energy Second law of energy – Deals with thermal process. – Heat can only flow from hot to cold, so the energy flow is one way. – Energy is not 100% efficient. There will ALWAYS be a loss of energy (car engine example) – Energy that is lost and converted into unusable forms is called Entropy.

Key terms Energy Potential Energy Kinetic Energy Heat energy Mechanical energy Electrical energy Chemical energy Light energy Law of Conservation of Energy