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