Energy
F I R E STOR M R E A L LY HA S NOT HI NG TO D O WI T H I T, HE ’ S J U S T
CO O L
Stuff & Things
• Tests – being graded.
• I’m not here Friday. You’ll have an online lab.
• Yes, we’re working next Tuesday and
Thursday.
• No, I don’t care what your other teachers
might say.
ENERGY!
What is it?
Where is it?
What does it do?
FEYNMAN!
•
https://www.youtube.com/watch?v=qMd4KOI6LF0
Energy stations!
•What you did
•What you saw
•Describe the event from start to
finish
What can we conclude?
Energy
Classified As
Potential
Energy
Dissipated
Energy
Kinetic Energy
(includes
thermal)
Divided Into
Gravitational
Potential Energy
Elastic
Potential
Energy
Energy
• The ability to cause change
• Can be transferred from one place or object to
another (via work, heat or radiating)
• Can be converted from potential to kinetic or
kinetic to potential
• Energy can not be created or destroyed. This
is called the Law of Conservation of Energy.
Potential Energy
• Stored Energy
• Has the potential to cause something to
change, but is not currently causing a change
• Several different representations of potential
energy. The two main categories:
Gravitational and Elastic Potential Energy
Gravitational Potential Energy (GPE)
• Results from an object being raised up while
the force of gravity acts on it.
• Depends on the force of gravity and how high
the object is raised.
Elastic Potential Energy (EPE)
• Results from an elastic material being
stretched or compressed some distance.
• Depends on how far the elastic material is
stretched / compressed and the material’s
spring constant.
Kinetic Energy
• Energy of motion
• Depends on the speed of the object and its
mass
Dissipated Energy
• Energy that is converted into energy that can no
longer be “used” as kinetic or potential energy.
• Dissipated energy usually remain in the original
location or object.
• For example, heat from friction.
Toy rabbits!
Pies!
Why must the pie remain the same size?
RABBITS
Friday
•Homework due
•Khan Academy – Hooke’s Law. Watch
and take notes.
•Hooke’s Law Lab - Phet