What are potential and kinetic energy?

Energy… …is the ability to make things move

The seven types of energy… Chemical - gasoline, Light – flash light, Heat – burner on a stove, Nuclear - sun, Mechanical - car, Sound – music on the radio, Electrical - lightning

Definitions Kinetic Energy: the energy of motion Potential Energy: stored energy

How is all energy divided? Potential Energy Kinetic Energy Gravitation Potential Energy Elastic Chemical

What is Potential Energy? Energy that is stored and waiting to be used later

What is Gravitational Potential Energy? Potential energy due to an object’s position P.E. = mass x height x gravity Don’t look down, Rover! Good boy!

What is Elastic Potential Energy? Potential energy due compression or expansion of an elastic object. Notice the ball compressing and expanding

What is Chemical Potential Energy? Potential energy stored within the chemical bonds of an object

What is Kinetic Energy? Energy an object has due to its motion K.E. = .5(mass x speed2)

A Roller Coaster A roller coaster speeds along its track. It has kinetic energy because it is moving.

A Roller Coaster As it slows to a stop at the top of a hill, it has potential energy because of where it is. It has the potential to move because it is above the ground and has somewhere to go.

What type of energy is this? (Remember the seven types?)

Right, mechanical. What if the cars crashed and burned Right, mechanical. What if the cars crashed and burned? What type would it be?

Right, heat.

Substances like wood, coal, oil, and gasoline have stored energy because of their chemistry – they can burn Stored energy is potential energy

Potential Energy can be changed into Kinetic Energy Also Kinetic Energy can be changed into Potential Energy