Kinetic and Potential Energy

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Kinetic and Potential Energy

• What is it?

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Objective

• TEKs Student is expected to illustrate examples
  of potential and kinetic energy in everyday life
  such as objects at rest, movement of geological
  faults, and falling water
• Examples
• Cars, Bicycles, Earthquakes, Waterfalls

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Kinetic Energy

• Kinetic energy is energy of motion. The kinetic
  energy of an object is the energy it possesses
  because of its motion.
• Kinetic energy is an expression of the fact that
  a moving object can do work on anything it hits
  it quantifies the amount of work the object could
  do as a result of its motion. The total
  mechanical energy of an object is the sum of its
  kinetic energy and potential energy.

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Using Kinetic Energy

• Kinetic energy is the energy of moving objects.
  As you sped down the steep hill on your bicycle,
  you were moving and therefore had kinetic energy.
  But where did this energy come from? You probably
  already know that it came from your position at
  the top of the hill. At the top of the hill, you
  had the ability to do work (move the bicycle)
  purely because of where you were. This resting or
  waiting energy is potential energy. You had the
  potential or possible ability to perform the work
  of moving the bicycle.

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Potential Energy

• Potential Energy the energy an object has
  because of its position, shape or condition.
• Potential energy can be thought of as energy
  stored within a physical system. It is called
  potential energy because it has the potential to
  be converted into other forms of energy, such as
  kinetic energy, and to do work in the process.

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Energy in Earthquakes

• Earthquakes happen mainly along faults near the
  edges of tectonic plates
• Stress causes potential energy to build up in
  rocks along a fault. When the fault moves, the
  Potential energy becomes Kinetic
• Energy.

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How Do Earthquakes Travel?

• Seismic Waves are waves of energy that travel
  through the earth, away from an earthquake in all
  directions.
• 2 Types of Waves
• Surface Waves travel only on the earths surface
• Body Waves which (include P waves S waves)
  travel through the earths interior

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Activity

• Stretch a spring across a table
• Hold one end of the spring while a partner holds
  the other end. Push your end toward your
  partners end and observe what happens.
• Repeat step 2, but shake the spring from side to
  side.
• Which type of seismic wave is represented in step
  2? In step 3?

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Falling Water

• At the top of the falls, water has high potential
  energy due to its height.
• At the bottom its Potential energy is zero
  because of the momentum has been converted to
  Kinetic Energy.

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Summary

• Kinetic Energy Energy of Motion
• Potential Energy Energy that an object has
  because of its position.
• Earthquakes - Potential energy is stored in the
  rock because of tectonic forces, or stress. When
  the rock shifts, potential energy is released and
  it changes into kinetic energy
• Waterfalls The water has its highest potential
  at the top of the falls, as it falls down it
  translates to kinetic energy.