Download Chapter 15.1

yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Document related concepts

Dark energy wikipedia , lookup

Open energy system models wikipedia , lookup

William Flynn Martin wikipedia , lookup

100% renewable energy wikipedia , lookup

Energy subsidies wikipedia , lookup

Energy storage wikipedia , lookup

Low-Income Home Energy Assistance Program wikipedia , lookup

Public schemes for energy efficient refurbishment wikipedia , lookup

Zero-energy building wikipedia , lookup

Low-carbon economy wikipedia , lookup

World energy consumption wikipedia , lookup

Alternative energy wikipedia , lookup

Energy Charter Treaty wikipedia , lookup

Regenerative brake wikipedia , lookup

Kinetic energy wikipedia , lookup

Potential energy wikipedia , lookup

Distributed generation wikipedia , lookup

International Energy Agency wikipedia , lookup

Energy returned on energy invested wikipedia , lookup

Energy policy of the United Kingdom wikipedia , lookup

Energy harvesting wikipedia , lookup

Energy policy of Finland wikipedia , lookup

Internal energy wikipedia , lookup

Energy efficiency in transport wikipedia , lookup

Life-cycle greenhouse-gas emissions of energy sources wikipedia , lookup

Negawatt power wikipedia , lookup

Energy in the United Kingdom wikipedia , lookup

Energy policy of the European Union wikipedia , lookup

United States energy law wikipedia , lookup

Conservation of energy wikipedia , lookup

Energy efficiency in British housing wikipedia , lookup

Energy Independence and Security Act of 2007 wikipedia , lookup

Energy applications of nanotechnology wikipedia , lookup

Chapter 15.1
ž  Energy
is the ability to do work. Work and
energy are very closely related!
ž  Work is a transfer of energy.
ž  Work and energy are measured in joules (J).
Think about the work and
energy involved in doing
something as simple as
carrying your backpack!
ž  The
energy of motion.
ž  The kinetic energy of any moving object
depends upon its mass and speed.
KE= ½ mv2
ž  mass
in kg
ž  Velocity in m/s
ž  KE in J (joules)
*Hint- Square your
velocity first,
multiply by your
mass, and then
multiply by .5
ž  A
.10 kg bird is flying at a constant speed of
8.0 m/s. What is the bird’s kinetic energy?
ž  Energy
that is stored as a result of position or
shape and has the potential to do work.
Why are these pictures examples of potential
ž  Potential
energy that depends upon an
object’s height.
ž  Depends on its mass, height, and
acceleration due to gravity.
PE= mgh
ž  mass is in kg
ž  Gravity is 9.8 m/s2
ž  Height in meters
ž  PE in J (joules)
ž  A
diver at the top of a 10 m high platform
has a mass of 50 kg. What is her gravitational
potential energy?
ž  The
potential energy of an object that is
stretched or compressed.
ž  The
major forms of energy are mechanical
energy, thermal energy, chemical energy,
electrical energy, electromagnetic energy,
and nuclear energy.
ž  Energy
associated with the motion and
position of everyday objects.
ž  Sum of the object’s potential and kinetic
ž  The
total potential energy of all the
microscopic particles make up its thermal
ž  When atoms move faster, the thermal energy
increases and objects become warmer.
ž  The
energy stored in the chemical bonds in
ž  When the bonds are broken, energy is
released to do work.
ž  Example: Car burning gasoline to move.
ž  The
energy associated with electric charges.
ž  Example: lightning, calculators
ž  Form
of energy that travels through space in
the form of waves.
ž  Ex: visible light, UV rays, X-rays
ž  The
energy stored in atomic nuclei.
ž  Ex: Nuclear fission and fusion