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Energy Conversion & Conservation

How Can a Waterfall Produce Electricity?

Energy Conversions in a Pole Vault

  • Potential and kinetic energy converts back and forth several times during a pole vault
  • Where would the vaulter's kinetic energy convert to elastic potential energy in the diagram?
  • Where would this elastic potential energy convert back into gravitational potential energy?
  • Where would the gravitational potential energy convert to kinetic energy?

Energy Conversions in Juggling

  • Objects that rise and fall experience changes in kinetic and gravitational potential energy
  • Which ball do you think will have the maximum amount of potential energy?
  • Which ball will have the maximum amount of kinetic energy?
  • Where will there be 50% kinetic and 50% potential energy?

______ energy to _______ energy

Name the Energy Conversions

What is an Energy Conversion?

An energy conversion is a change from one form of energy to another

This alarm clock converts electrical energy to light energy, and sound energy.

Name the Energy Conversions

Don't Be Confused...

For This Unit, Conserving DOESN'T Mean Saving!

Conserving energy means SAVING energy.

But the Law of Conservation of Energy refers to a quantity that remains CONSTANT. In science energy is always conserved because its total quantity does not change.

If Energy is Neither Created Nor Destroyed, Where Does it "Go?"

Law of Conservation of Energy

The Law of Conservation of Energy states that energy cannot be created or destroyed

What happens to the kinetic energy in a swing when it stops swinging?

  • Energy encounters friction, and the motion of the atoms increase
  • This means thermal energy increases
  • Thus, the mechanical energy is converted--no energy was destroyed!

Energy Conversions in a Waterfall

  • There is a potential to kinetic energy conversion in waterfalls.
  • What kind of potential energy would be at the top of this waterfall?
  • What happens to the amount of kinetic energy in the water as it reaches the bottom? What causes this?

Energy Conversion in a Pendulum

  • Kinetic and potential energy is continuously converted when a pendulum swings
  • Which 2 points on this diagram would show gravitational potential energy?
  • What happens to the amount of kinetic energy as the pendulum swings across?
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