Potential and Kinetic Energy

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Potential and Kinetic Energy
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Intro Videos to watch

• Take a look at these videos
• http//www.neok12.com/video/Energy-and-Work/zX707f
  5b60615d600346020a.htm
• And
• http//www.neok12.com/video/Energy-and-Work/zX6652
  5f0367767a555e680a.htm
• Now go through the rest of this slide show to
  learn more about Potential and Kinetic Energy

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How is all energy divided?
All Energy
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What is Potential Energy?

• Energy that is stored and waiting to be used later

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What is Gravitational Potential Energy?

• Potential energy due to an objects position
• P.E. mass x
• height x gravity

Dont look down, Rover! Good boy!
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What is Elastic Potential Energy?

• Potential energy due compression or expansion of
  an elastic object.

Notice the ball compressing and expanding
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What is Chemical Potential Energy?

• Potential energy stored within the chemical bonds
  of an object

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What is Kinetic Energy?

• Energy an object has due to its motion
• K.E. .5(mass x speed2)

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Now your turn!

• Click on this website then click on
  and answer the questions on this page about the
  rollercoaster before clicking play.
  http//www.pbslearningmedia.org/asset/mck05_int_ro
  llercoaster/
• What numbers on the rollercoaster represent where
  the potential energy would be the greatest?
• The kinetic energy the greatest?
• The potential energy the least?
• The kinetic energy the least?

Step
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Click Play and watch the rollercoaster go!

• Were you correct in your predictions?
• What was the rollercoaster doing every time the
  potential energy was very high? Sitting still or
  moving?
• What was the rollercoaster doing every time the
  kinetic energy was very high? Sitting still or
  moving?

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Lets look at another example
A
A
B
C

• When the pendulum is at the top of its swing A,
  which is the greatest? Potential or Kinetic
  Energy
• What about the bottom of its swing B?
• What about half way between the top and the
  bottom C?

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How about Chemical Potential to Kinetic Energy

• Is the energy in the battery Potential or Kinetic
  Energy?
• When you place the battery in the flashlight is
  the energy in the battery Potential or Kinetic
  Energy?
• When you turn the switch of the flashlight on,
  the energy in the battery is converted from
  ____________________ Energy to ________________Ene
  rgy in the form of ____________ and __________.

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How about a spring?
A
B

• Where is the energy stored ( the potential
  energy) in this clip?
• The transfer of potential energy to kinetic
  energy causes what action?
• At what letter on the clip above is kinetic
  energy the greatest?

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Now we know!

• Energy is either stored or moving!
• When it is stored it is potential energy!
• When it is kinetic it is moving!
• Take a look at these videos
• http//www.neok12.com/video/Energy-and-Work/zX707f
  5b60615d600346020a.htm
• And
• http//www.neok12.com/video/Energy-and-Work/zX6652
  5f0367767a555e680a.htm