Download Potential energy

Reporting Category #2
Forces, Motion, and Energy
Energy Forms
• Many forms of energy exist around us.
• Energy cannot be created or destroyed,
only changed from one form to another.
Some Energy Forms
•
•
•
•
Mechanical
Heat
Nuclear
Electrical
•
•
•
•
Light
Sound
Chemical
Electromagnetic
Turning on a
lamp
Bulb Filament
Burning coal
Fossil fuel
Electrical to
light
gets hotter,
glowing
Chemical to heat gets hotter,
glowing,
evaporating
Earthquake
Buildings
Heat to sound
cracking,
crumbling
Phosphorescence
Fire fly
Chemical to light glowing
Playing a violin
String
Mechanical to
sound
vibrating
Potential Energy
• Potential energy is energy that is
stored in an object.
• If you stretch a rubber band, you will
give it potential energy. As the rubber
band is released, potential energy is
changed to motion.
Kinetic Energy
• Kinetic energy is energy of motion.
• A rubber band flying through the air
has kinetic energy. When you are
walking or running your body is
exhibiting kinetic energy.
• Potential energy is converted into
kinetic energy.
Potential & Kinetic Energy
• The apple hanging from the branch
has __________ energy. Potential
energy is __________ energy.
Potential energy changes to
___________ energy when the
apple starts to fall. Would an
apple sitting on the ground have
potential energy? Kinetic energy is
_________. Anything in motion
has energy. Would an apple sitting
still on the ground have kinetic
energy?
Potential & Kinetic Energy
• The diver standing on the diving board
has ________ energy. Potential energy
becomes _________ energy when he
dives off the board. Potential energy is
_________ energy. _________ energy
is the energy of motion. The diver's
potential energy __________ as he
climbs up the ladder.
Potential & Kinetic Energy
• The ax has the most __________ energy at
its highest point, just before it starts to fall.
As the ax starts to fall, potential energy
changes to ____________ energy. The
___________ energy of the ax is greatest
just before it strikes the wood when it is
moving at its ___________. The instant the
ax strikes the wood, kinetic energy is
transferred ________________________.
The ax stops moving, but wood chips fly
everywhere.
Newton’s Laws of Motion
• Newton’s Law of Inertia
• An object at rest tends to
stay at rest and an object
in motion tends to stay in
motion with the same
speed and in the same
direction unless acted upon
by an unbalanced force
Newton’s Laws of Motion
• Newton’s Law of Force and
Acceleration:
• As the force acting upon an object is
increased, the acceleration of the
object is increased. As the mass of an
object is increased, the acceleration of
the object is decreased.
Newton’s Laws of Motion
• Newton’s Law of actionreaction
• For every action there is an
equal and opposite reaction.
• If you lean against the wall,
you don't just fall through
it. The wall pushes back on
you as hard as you push on
it, and you and the wall stay
in place.
Electromagnetic Wave
• Electromagnetic wave: Transverse waves that
are produced by the motion of electrically
charged particles. Ex: The Light Spectrum