Transcript Conservation of Energy - Kent City School District

Conservation of Energy
The Law of
Conservation 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 Energy

Energy ______________ to be released
Elastic Potential Energy

Elastic PE depends on the
________________ in the object
Gravitational PE depends
on:

MASS of the object
 HEIGHT of the object
 Acceleration due to GRAVITY
PE
= mgh
Kinetic Energy

Energy contained within
________________ objects.
Kinetic Energy depends on:

MASS of an object
 VELOCITY of the object
KE
=½
2
mv
When you are at the top of the roller
coaster, you are high off the ground
and you have a lot of _______energy.
As the roller coaster moves down the hill
the potential energy is _____________ into
Kinetic energy. (The car loses _______ but
gains _____)
As the roller coaster travels up the next hill
_______energy (speed) is converted back
to ________energy (height).
Where is the PE the greatest?
Fly Wheel
KE=0
PE=90J
KE=0
PE=90J
KE=
PE=60J
KE=0
PE=90J
KE=30J
PE=60J
KE=0
PE=90J
KE=30J
PE=60J
KE=
PE= 30J
KE=0
PE=90J
KE=30J
PE=60J
KE=60J
PE= 30J
KE=0
PE=90J
KE=30J
PE=60J
KE=60J
PE= 30J
KE =
PE = 0J
KE=0
PE=90J
KE=30J
PE=60J
KE=60J
PE= 30J
KE =90J
PE = 0J