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Energy. SI units. energy = joule (J) = 1 Nm = 1 kg ·m 2 /s 2. Conservation. Energy can be converted from one form to another, but it cannot be created or destroyed in an ordinary chemical or physical change. Two big classes. Kinetic – energy of motion Potential – stored energy.

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Energy

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Energy

Energy


Si units

SI units

  • energy = joule (J) = 1 Nm = 1 kg·m2/s2


Conservation

Conservation

  • Energy can be converted from one form to another, but it cannot be created or destroyed in an ordinary chemical or physical change.


Two big classes

Two big classes

  • Kinetic – energy of motion

  • Potential – stored energy


Potential energy

Potential Energy

  • Energy stored due to

    • position (where it is)

      • Example: GPE, spring energy

    • composition (what it is made of)

      • Example: chemical, nuclear


Energy1

Energy

  • thermal/heat (more later)

  • electromagnetic / radiant / light

  • Mechanical energy ME = KE + GPE

  • electrical

  • sound


Energy equations

Energy equations

  • KE = mv2/2

  • GPE = weight x height= mgh

  • ME = KE + GPE


Energy

Radiation

Conduction

Matter not required

Can occur in space

Waves

Objects touch each other

Collisions of atoms

Heat transfer

From hot to cold

Matter required

Currents in a fluid

Different densities created

Objects touch each other

Matter required

Matter not required

From hot to cold

Can occur in space

Currents in a fluid

Collisions of atoms

Different densities created

Waves

Read pages 280-284.

Directions: Put phrases of the other box into the Venn diagram. Zones may have no phrases, one phrase, or more than one phrase. Use all the phrases

Convection


Heat v temperature

heat -v- temperature

  • Heat = total amount of energy of moving particles

  • Temperature = average energy of the moving particles.


Can you name some energy conversions

Can you name some energy conversions?


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