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Chapter 9.3

Chapter 9.3. Mechanical Energy. 9.3 Mechanical Energy. The two forms of mechanical energy are kinetic energy and potential energy. 9.3 Mechanical Energy. Mechanical energy is the energy due to the position of something or the movement of something. Mechanical Energy = PE + KE.

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Chapter 9.3

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  1. Chapter 9.3 Mechanical Energy

  2. 9.3Mechanical Energy The two forms of mechanical energy are kinetic energy and potential energy.

  3. 9.3Mechanical Energy Mechanical energy is the energy due to the position of something or the movement of something.

  4. Mechanical Energy = PE + KE 100 J = 100 J PE + 0 J KE 100 J = 50 J PE + 50 J KE 100 J = 0 J PE + 100 J KE

  5. Mechanical Energy • Total mechanical energy = kinetic energy + potential energy • TME = KE + PE • 100 J = 0 J + 100 J • At rest, no KE, no motion • 100 J = 50 J + 50 J • In motion, 50 J of PE transferred, object now has 50 J of KE. • 100 J = 100 J + 0 J • In motion, no potential energy (100 J transferred to KE) • In each case, the total mechanical energy is the same. As the PE decreases, the KE increases.

  6. Indicate where: • KE is at a minimum and maximum • PE is at a minimum and maximum • The speed is greatest • The speed is least

  7. KE min KE min PE max PE max V = 0 m/s V = 0 m/s transformation of PE to KE (release) transformation of KE to PE (storage) KE max PE min V = maximum

  8. 9.3Mechanical Energy What are the two forms of mechanical energy?

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