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# Potential vs. Kinetic Energy - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Potential vs. Kinetic Energy' - galvin-dudley

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Presentation Transcript

• Potential Energy—energy of position or condition.

• PEg = mgh = Fgh

• Kinetic Energy—energy of motion.

• KE = ½ mv2

• Mechanical Energy—Total PE + KE

• ALWAYS REMAINS CONSTANT!!!

• Where is KE the greatest? Least?

• 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!!)

• 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 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!!

90 oC

25 oC

90 oC

25 oC

D graph?T

Boiling Pt.

Gas

DPhase

DT

Liquid

Melting Pt.

DPhase

DT

Solid

3 Ways to Transfer Heat graph?

• Conduction---direct contact

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

Waves graph?

• Waves transfer ENERGY, not matter!!

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 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 shortest wavelength?

What waves have the lowest frequency?

What waves carry the least energy?