Transcript Energy

Conservation of Energy
Potential Energy
Kinetic Energy
Energy Notes
Investigative Science
Lab book pages
Mechanical Energy
Friction
Force
What does Conservation
of Energy mean?
• Energy can flow from one object to
another.
• Energy cannot be created or destroyed.
• It is converted from one form to another.
• Energy in an isolated system is conserved.
• This is also known as the first law of
thermodynamics
What is Heat Transfer?
When thermal energy flows from a
material at a higher temperature to
a material at a lower temperature.
What are the three
mechanisms of heat
transfer?
1. Conduction
2. Convection
3. Radiation
What is Conduction?
• Transfer of heat by the direct contact of
particles of matter
• Requires matter to transfer heat
• Ex:
– Taking a hot bath
– Heat a piece of metal
– holding your hands around a
cup of hot cocoa.
What is Convection?
• Transfer of heat by the actual motion of a
fluid (liquid or gas) in the form of currents.
• Warmer fluids are less dense and rise.
Cooler fluids are more dense and sink.
• Requires matter to transfer heat
• Ex: Hot water and ocean breezes
What is Radiation?
• Direct transfer of energy by
electromagnetic waves.
• Does not require matter to transfer heat
• Ex:
– Warmth from the Sun in the form of visible
light
– Infrared radiation (like your microwave)
– A small amount of ultraviolet radiation
What is Potential
Energy?
• Energy of Position
• Stored energy and the energy of
position gravitational energy.
• Something has potential to move!
What is Kinetic Energy?
• Energy of Motion
• A form of energy associated with the
motion of a body of matter.
What is Mechanical
Energy?
• The sum of the kinetic energy and
the potential energy of a body of
matter.
What is Chemical
Energy?
• Energy stored in chemicals and
energy released or absorbed in
chemical reactions are called
chemical energy.
What is
Friction?
• The force exerted by a body of
matter when it slides past another
body of matter.
• A force in the opposite direction of
motion. E.g.. Rubbing hands together.
Ticket out the door
* Write each example
* Label if it is Potential Energy, Kinetic Energy or
Chemical Energy and turn in at end of class.
1.
2.
3.
4.
5.
6.
7.
8.
A rock balanced at the edge of a cliff
A piece of coal
A landslide
A roller coaster car going down a hill
A diver on a ten meter platform
A skateboarder rolling down a big ramp
A car battery
A mountain biker flying through the air after
hitting a large rock
9. A cheeseburger