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Potential vs. Kinetic Energy - PowerPoint PPT Presentation

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Potential vs. Kinetic Energy. Potential Energy—energy of position or condition. PE g = mgh = F g h Kinetic Energy—energy of motion. KE = ½ mv 2 Mechanical Energy—Total PE + KE ALWAYS REMAINS CONSTANT!!!. Where is PE the greatest? Least? Where is KE the greatest? Least?. Work vs. Power.

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Potential vs kinetic energy
Potential vs. Kinetic Energy

  • Potential Energy—energy of position or condition.

    • PEg = mgh = Fgh

  • Kinetic Energy—energy of motion.

    • KE = ½ mv2

  • Mechanical Energy—Total PE + KE


  • Where is PE the greatest? Least?

    Where is KE the greatest? Least?

    Work vs power
    Work vs. Power

    • Work—transfer of energy through motion

      • 1. Object must move.

      • 2. Movement must be in direction of the applied force.

        W = Fd

    • Power—time rate of doing work!!

      P = W/t

      **May need to find work in order to find Power!!

      **If you are lifting an object, force required is equal to the weight of the object(not the mass!!)

    Heat energy
    Heat Energy

    • Specific Heat—Amount of heat required to change the temperature of a substance!!

      • Different for all substances!!!

      • Metal heats faster than wood, but also cools faster!!!

      • Low specific heat= heat up fast, cool down fast!!

      • High specific heat= heat up slow, cool down slow!!

    Heat energy cont
    Heat Energy(cont.)

    • Heat energy always flows from High temperature substance to low temperature substance!!!

    • When you add heat to a substance, one of two things will happen, but never at the same time:

      • Substance changes temperature!!

      • Substance changes phase!!

    D graph?T

    Boiling Pt.





    Melting Pt.




    3 ways to transfer heat
    3 Ways to Transfer Heat graph?

    • Conduction---direct contact

    • Convection—transfer of heat in liquids and gases!!

    • Radiation—transfer through empty space!!

    Waves graph?

    • Waves transfer ENERGY, not matter!!

    Wave properties cont
    Wave Properties(cont.) graph?

    • Frequency is # waves per time!!

    • Frequency is related to pitch!!

    • Amplitude is related to amount of energy!!

      • Taller waves carry more energy!!

      • Smaller waves carry less energy!!!

    • Velocity = frequency x wavelength

      vw = f l

    Electromagnetic spectrum
    Electromagnetic Spectrum graph?

    • The spectrum is on your formula sheet.

      • Wavelength is shown.

      • Must be able to answer questions about frequency and amount of energy, also.

      • If all electromagnetic waves travel at the speed of light, remember the relationship between wave velocity, frequency, and wavelength.

      • As the wavelength get longer, the frequency and amount of energy gets smaller.

      • As the wavelength gets shorter, the frequency and amount of energy gets higher.

    What waves have the longest wavelength? graph?

    What waves have the shortest wavelength?

    What waves have the highest frequency? graph?

    What waves have the lowest frequency?

    What waves carry the most energy? graph?

    What waves carry the least energy?