Conservation of EnergyConservation of Energy

The Law of The Law of Conservation of EnergyConservation of Energy

Energy cannot be CREATED or DESTROYED.

Energy is just CONVERTED from one form to another.

The amount of energy present at the beginning of a process EQUALS the amount of energy present at the end of the process.

PE + KE (before) = PE + KE (after)

Potential EnergyPotential Energy

Energy ______________ to be released

Elastic Potential EnergyElastic Potential EnergyElastic PE depends on the

________________ in the object

Gravitational PE depends Gravitational PE depends on:on:

MASS of the objectHEIGHT of the objectAcceleration due to GRAVITY

PE = mgh

Kinetic EnergyKinetic Energy

Energy contained within ________________ objects.

Kinetic Energy depends on:Kinetic Energy depends on:

MASS of an objectVELOCITY of the object

KE = ½ mv2

When you are at the top of the roller When you are at the top of the roller coaster, you are high off the ground coaster, you are high off the ground and you have a lot of _______energy.and you have a lot of _______energy.

As the roller coaster moves down the hill As the roller coaster moves down the hill the potential energy is _____________ into the potential energy is _____________ into Kinetic energy. (The car loses _______ but Kinetic energy. (The car loses _______ but gains _____)gains _____)

As the roller coaster travels up the next hill As the roller coaster travels up the next hill _______energy (speed) is converted back _______energy (speed) is converted back to ________energy (height).to ________energy (height).

Where is the PE the greatest?Where is the PE the greatest?

Fly Wheel Fly Wheel

KE=0PE=90J

KE=0PE=90J

KE= PE=60J

KE=0PE=90J

KE=30J PE=60J

KE=0PE=90J

KE=30J PE=60J

KE= PE= 30J

KE=0PE=90J

KE=30J PE=60J

KE=60J PE= 30J

KE=0PE=90J

KE=30J PE=60J

KE = PE = 0J

KE=60J PE= 30J

KE=0PE=90J

KE=30J PE=60J

KE =90J PE = 0J

KE=60J PE= 30J