Download Kinetic Energy

Energy
Kinetic Energy
Forms of Energy
Potential
Energy
Forms of Energy
There are five
• Mechanical – matter in motion has mechanical
energy
• Heat – internal motion of particles releases heat
• Chemical – energy used/released that forms or
breaks bonds
• Electromagnetic – this is any moving electric
charges including light. Electric power lines and
motors, X-rays and radio waves
• Nuclear – when a nucleus splits or fuses this
energy is released or used. The sun’s energy is
nuclear.
Mechanical Energy
Water in a waterfall or a car
moving has mechanical energy.
You walking, running or riding a bike have
mechanical energy
Sound
Heat Energy
Rub your hands together for several seconds
and feel the heat. You have converted
mechanical energy into heat energy.
Often causes changes in the temperature and
phase of any form of matter.
Chemical Energy
The chemical energy stored in food is
converted to ATP and used to power your
activities.
Electromagnetic Energy
Moving electric charges such as those in
power lines bringing electricity to your house.
Everything on the
electromagnetic
spectrum has this
energy including
visible light.
Nuclear Energy
When a nucleus splits nuclear energy is
released in the form of heat and light.
Or
When nuclei collide at high speeds and fuse
then nuclear energy is
released. This happens in
the sun.
Kinetic Energy
Kinetic Energy is energy of
motion. When you walk, run,
swim and jump, you have
kinetic energy.
Kinetic Energy
The faster an object moves, the
more kinetic energy it has. So
kinetic energy is directly related to
the velocity of an object. In
baseball, a fast ball has more
kinetic energy than a slow curve.
You have more kinetic energy
when you ____________than
when you ____________.
Kinetic Energy
A battleship that is moving at 40km/hr has
much more kinetic energy than a mosquito
moving at the same velocity. So kinetic
energy must depend on something other
than just velocity. The battleship has more
kinetic energy because it has greater mass.
Potential energy
Potential energy is energy stored in an object
due to its position.
Potential energy
Stretch a rubber band between your
thumb and index finger. Keep the
rubber band stretch without any
motion. How long can you hold it
this way? After a short while you
begin to sense the energy in the
rubber band. Yet the rubber band is
not moving! The stretched rubber
band has energy stored in it. You
cannot see this energy, but you know
it is there because the stretched rubber
band can do work as it returns to its
normal shape.
Energy Conversions
Changes in the forms of energy
are called energy conversions.
One of the most common
energy conversion involves the
changing of potential energy to
kinetic energy OR kinetic
energy to potential energy.
Energy Conversion
Can you think of an example of an energy
conversion? Either Kinetic to Potential OR
Potential to Kinetic?
How about in your
Egg Bungee Jump?