Transcript Potential and Kinetic Energy

Potential and
Kinetic Energy
ENERGY IN GENERAL
• Energy: the ability to do work
• It can be found in many forms.
• Energy can be converted from one
form to another.
• Although energy can be changed, it
cannot be created nor destroyed.
Potential Energy
• Stored energy
• Example: If you stretch a rubberband, you will
give it potential energy. As the rubberband is
released, potential energy is changed to
kinetic energy.
• Example: When a roller coaster is at the top of
a hill, it has a high amount of potential energy.
As the coaster moves down the hill, the
potential energy is changed to kinetic energy.
Kinetic Energy
• Energy of motion
• Example: When you are walking or
running your body is exhibiting kinetic
energy.
• Example: A yo-yo falling is an
example of kinetic energy.
Energy Changing Forms
• Some stoves transform chemical energy (gas,
wood, coal ) into heat energy.
• Wind mills use the kinetic energy from air
molecules to transform it into electrical
energy.
• Hydroelectric plants transform
kinetic energy of falling water
into electrical energy.
Your Turn!!!!
Suppose there is an apple hanging from a
tree and it is fixing to fall to the ground.
• Is there potential energy present?
• Is there kinetic energy present?
• Where is the potential energy the
greatest?
• Where is the kinetic energy the greatest?
Suppose a child was at the top of a playground
slide waving at his Mom and he was fixing to
slide down.
• Is there potential energy present?
• Is there kinetic energy present?
• Where is the potential energy the
greatest?
• Where is the kinetic energy the
greatest?
What factors
determine the amount
of potential and kinetic
energy?
Energy and Work
• Work: result of a force acting on a
body and producing motion
• Ex: If you push a desk across the
floor, you are doing work on the desk
because you are exerting a force
that causes motion.
Where are potential
and kinetic energy
found in our
environment?