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## PowerPoint Slideshow about ' Energy' - mervyn

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Presentation Transcript

SI units

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

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

Potential Energy

- Energy stored due to
- position (where it is)
- Example: GPE, spring energy

- composition (what it is made of)
- Example: chemical, nuclear

- position (where it is)

Energy

- thermal/heat (more later)
- electromagnetic / radiant / light
- Mechanical energy ME = KE + GPE
- electrical
- sound

Energy equations

- KE = mv2/2
- GPE = weight x height = mgh
- ME = KE + GPE

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 = total amount of energy of moving particles
- Temperature = average energy of the moving particles.

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