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ENERGY

Energy Transformations. ENERGY. Energy. Defined as the ability to do work or to accomplish a task. Can be stored and used later for work Always conserved and cannot be created nor destroyed . There are two categories of energy. Potential Energy.

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ENERGY

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  1. Energy Transformations ENERGY

  2. Energy • Defined as the ability to do work or to accomplish a task. • Can be stored and used later for work • Always conserved and cannot be created nor destroyed. • There are two categories of energy.

  3. Potential Energy • Stored energy due to an object’s state. It is energy that has the potential to do work. • Types of potential energy: • Chemical: Energy stored within the molecules of a substance. • Nuclear: Energy stored within the nucleus of an atom. • Gravitational: The stored energy of an object due to its position height above a surface.

  4. Elastic Potential: Energy stored by bending or compressing an elastic material (spring). • Electric Potential: Stored energy of charged objects due to their position and charge. • Magnetic Potential: Stored energy of magnetized objects.

  5. Kinetic Energy • The energy of motion. • Types of Kinetic Energy: • Bulk Kinetic: Energy that is due to motion of an entire object (i.e a rolling cue ball). • Sound: Energy transmitted from molecule to molecule within a medium.

  6. Thermal: Energy an object has due to motion of molecules within a substance. Radiant: Energy that is transmitted via electromagnetic (EM) waves such as radio, light, x-rays, etc. Electric: Energy associated with moving electric charges.

  7. Energy Transformations • Energy can be transformed from one form to another. In the above lists. • Most household devices are ones that transform electrical energy to another form. • Consider a microwave oven: Electrical energy -> Radiant Energy + Sound + Bulk Kinetic + Light

  8. Eg.1: Determine the energy transformations in each case below. • Hand crank generator • Solar powered calculator • Battery powered flashlight

  9. Eg.2: List as many devices that performs the following energy transformation around your house. • Chemical potential energy -> light energy + sound energy • Electrical energy -> kinetic energy + sound energy

  10. Homework • Take your own textbook and complete the following: • P.129 #2 • P.130 #3,4 • P.131 #2-4

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